6:00 p.m. Wednesday, May 13, 2026: Cuesta Water Main Incident  

Road Closure Alert During Mechanical Pipeline Cleaning
On Thursday, May 14, the intersection of Drucilla Drive and Montalto Drive will be intermittently closed to general traffic from approximately 7:00 a.m. – 7:00 p.m. Residents living on Drucilla Drive and Carla Court will be allowed to enter and exit through the closure.

The roadway closure will allow for the mechanical cleaning of the pipes—called “pipeline pigging”—along Drucilla Drive and Carla Court. A foam “pig” device, similar in shape to a large earplug, is inserted into the pipe. The device is then pushed through with water pressure. This will be done repeatedly and from several different insertion points. This method of pipeline cleaning is being done to clean out any possible foreign material in the pipe.

Water Sampling Continues
On May 13, the City increased the number of water samples taken and used varied locations, including street-side service lines in the affected area. Test results are expected on Thursday, May 14.

About the Water Main Incident
Currently, 21 homes, located north of Cuesta Park, remain under boil water restrictions until further notice. 

The water main breach involved a private contractor that was hired by the City. The Friday, April 24, incident concerned a contamination breach with some cement slurry mix coming into contact with a live water main near the intersection of Bonita Avenue and Cuesta Drive. 

Questions or Assistance 
For residents in the affected area who have questions, please call 650-903-6081 or email WaterQuality@mountainview.gov.  

For questions specifically about the temporary lodging program, call 650-903-6081 and press 2. 

Stay Informed  
To receive updates via email on the Cuesta Water Main Incident, subscribe to “City News” at MountainView.gov/eNotify. 

For more information, including resources for residents, visit MountainView.gov/CuestaWaterMain.

Next Update 
The City will issue the next incident update when new information is available.  

Media Inquiries 
For media inquiries, email Communications@mountainview.gov or call Lenka Wright, Chief Communications Officer, at 650-903-6615.

7:00 p.m. Tuesday, May 12, 2026: Cuesta Water Main Incident 

“Boil Water” Notice Remains in Effect for 21 Homes
One of the water samples collected on May 11 from the Drucilla Drive pipe reconnections between Montalto Drive and Leona Lane has tested positive for coliform bacteria. This means that the “Boil Water” notice will remain in effect for the 21 homes in the Drucilla Drive/Carla Court area (shown on the map in red). The City is in contact with the State Water Board regarding options moving forward and next steps. The City remains committed to restoring safe drinking water as quickly as possible.

The City will continue to provide hotel rooms, meal and incidentals per diem payments, and access to shower facilities for the residents of these homes through the morning of Monday, May 18. More information on showers and hotel accommodation is below.

Updated Dates and Times for Temporary Shower Access
The City will continue to provide temporary shower access to residents who remain impacted by the water main incident. The shower facilities are located at the Rengstorff Park Aquatics Center and El Camino YMCA. Their hours are listed below:

Rengstorff Park Aquatics Center

• Wednesday, May 13: 7:30 a.m.–1:00 p.m., 6:30–8:30 p.m.
• Thursday, May 14: 7:30 a.m.–1:00 p.m., 4:30–8:30 p.m.
• Friday, May 15: 7:30 a.m.–1:00 p.m., 6:30–8:30 p.m.
• Saturday, May 16: 9 a.m.–2:00 p.m.
• Sunday, May 17: 9 a.m.–2:00 p.m.
• Monday, May 18: 7:30 a.m.–1:00 p.m., 6:30–8:30 p.m.

YMCA

• Wednesday, May 13: 5:30 a.m.–9:00 p.m.
• Thursday, May 14: 5:30 a.m.–9:00 p.m.
• Friday, May 15: 5:30 a.m.–9:00 p.m.
• Saturday, May 9: 7:00 a.m.-6:00 p.m.
• Sunday, May 10: 8:00 a.m.-5:00 p.m. 
• Monday, May 11: 5:30 a.m.-9:00 p.m. 

Temporary Lodging Available for Impacted Residents
The City is providing temporary lodging with several hotels through Monday, May 18. They include:

• Ameswell Hotel, 800 Moffett Blvd, Mountain View, CA | Phone: 650-880-1000 | Pet Friendly
• Days Inn Mountain View, 850 Leong Dr, Mountain View, CA |Phone: 408-915-3669
• Extended Stay America Suites, 190 E El Camino Real, Mountain View, CA | Phone: 650-962-1500 | Kitchens | Pet Friendly
• Ramada by Wyndham Mountain View, 55 Fairchild Dr, Mountain View, CA | Phone: 650-967-6856
• Shashi Hotel Mountain View, 1625 N Shoreline Blvd, Mountain View, CA| Phone: 650-420-2600 | Pet Friendly
• Super 8 Mountain View, 1665 W El Camino Real, Mountain View, CA | Phone: 650-969-9641
• TownePlace Suites, 606 S. Bernardo Avenue, Sunnyvale, CA | Phone: 408-733-4200 | Kitchens | Pet Friendly

Alternatively, the City will reimburse impacted residents up to $192+tax/night if they choose to use a different hotel of their choice.

For any lodging questions, please call 650-903-6081 and press 2.

About the Water Main Incident
Currently, 21 homes, located north of Cuesta Park, remain under boil water restrictions until further notice. 

The water main breach involved a private contractor that was hired by the City. The Friday, April 24, incident concerned a contamination breach with some cement slurry mix coming into contact with a live water main near the intersection of Bonita Avenue and Cuesta Drive. 

Questions or Assistance 
For residents in the affected area who have questions, please call 650-903-6081 or email WaterQuality@mountainview.gov.  

For questions specifically about the temporary lodging program, call 650-903-6081 and press 2. 

Stay Informed  
To receive updates via email on the Cuesta Water Main Incident, subscribe to “City News” at MountainView.gov/eNotify. 

For more information, including resources for residents, visit MountainView.gov/CuestaWaterMain.

Next Update 
The City will issue the next incident update when new information is available.  

Media Inquiries 
For media inquiries, email Communications@mountainview.gov or call Lenka Wright, Chief Communications Officer, at 650-903-6615.

4:00 p.m. Monday, May 11, 2026: Cuesta Water Main Incident

Next Steps for Restoring Safe Drinking Water in Affected Area
The “super chlorination” of the pipe on Drucilla Drive and Carla Court has concluded. Sample results indicate that the pipe has been properly disinfected, with no bacteria remaining post-disinfection.

As a result, construction started on Monday, May 11, to reconnect the water pipe at both ends of Drucilla Drive (at Leona Lane and Montalto Drive) to restore full water service to the 21 affected households. This pipe reconnection work is anticipated to conclude this evening.

Following the pipe reconnection, another sample will be taken for verification that no bacteria are present. Sample results have a turnaround time of approximately 24-30 hours.

Update on Emergency Water Supplies and Temporary Lodging Program
Once residents, who live north of Cuesta Park, have performed their household flush and no longer need the bottled water delivery, they should call Water World at 408-641-5440 to cancel the service before placing all empty bottles out to for pickup. If residents place bottles out without canceling, Water World will continue to exchange empty for new bottles until May 13th.

For the 46 homes that had their boil water restrictions lifted, Water World will perform the final pickup for all bottles on Wednesday, May 13.

For the remaining 21 homes under boil water restrictions, Water World is scheduled to perform the final pickup for all bottles one week after the Boil Water order is lifted.

The City does not anticipate that the Boil Water order will be lifted earlier than Wednesday, May 13. As a result, the City’s Temporary Lodging Program will remain available to affected residents who live in the impacted area through Tuesday, May 12 (checkout on Wednesday, May 13).

About the Water Main Incident
On Wednesday, May 6, a “Boil Water” notice was lifted for 46 of the original 67 homes impacted by the Cuesta water main breach. Currently, 21 homes, located north of Cuesta Park, remain under boil water restrictions until further notice.

The water main breach involved a private contractor that was hired by the City. The Friday, April 24, incident concerned a contamination breach with some cement slurry mix coming into contact with a live water main near the intersection of Bonita Avenue and Cuesta Drive.

Questions or Assistance 
For residents in the affected area who have questions, please call 650-903-6081 or email WaterQuality@mountainview.gov.

For questions specifically about the temporary lodging program, call 650-903-6081 and press 2.

Stay Informed  
To receive updates via email on the Cuesta Water Main Incident, subscribe to “City News” at MountainView.gov/eNotify.

For more information, including resources for residents, visit MountainView.gov/CuestaWaterMain.

Next Update 
The City will issue the next incident update when new information is available.

Media Inquiries 
For media inquiries, email Communications@mountainview.gov or call Lenka Wright, Chief Communications Officer, at 650-903-6615.

6:30 p.m. Friday, May 8, 2026: Cuesta Water Main Incident

Next Steps for Restoring Safe Drinking Water in Affected Area
Water sample testing continues for the water lines that serve the 21 homes in the Drucilla Drive/Carla Court area. These 21 homes remain under a “Boil Water” notice.

The “super chlorination” period concluded late Thursday night with pipe flushing. Samples from the disinfected pipe have been taken for lab analysis. Due to these latest developments, there will be minimal construction activity over the weekend.

On Monday, May 11, residents in the affected area should expect the construction work to resume as the City of Mountain View continues to work to restore full water services in coordination with the State Water Resources Control Board.

The City will keep affected residents updated on the schedule as more information is available.

Update on Emergency Water Supplies and Temporary Lodging Program
Once residents, who live north of Cuesta Park, have performed their household flush and no longer need the bottled water delivery, they should call Water World at 408-641-5440 to cancel the service before placing all empty bottles out to for pickup. If residents place bottles out without canceling, Water World will continue to exchange empty for new bottles until May 13th.

For the 46 homes that had their boil water restrictions lifted, Water World will perform the final pickup for all bottles on Wednesday, May 13.

For the remaining 21 homes under boil water restrictions, Water World is scheduled to perform the final pickup for all bottles on one week after the Boil Water order is lifted.

The City does not anticipate that the Boil Water order will be lifted earlier than Wednesday, May 13. As a result, the City’s Temporary Lodging Program will remain available to affected residents who live in the impacted area through Tuesday, May 12 (checkout on Wednesday, May 13).

About the Water Main Incident
On Wednesday, May 6, a “Boil Water” notice was lifted for 46 of the original 67 homes impacted by the Cuesta water main breach. Currently, 21 homes, located north of Cuesta Park, remain under boil water restrictions until further notice.

The water main breach involved a private contractor that was hired by the City. The Friday, April 24, incident concerned a contamination breach with some cement slurry mix coming into contact with a live water main near the intersection of Bonita Avenue and Cuesta Drive.

Questions or Assistance
For residents in the affected area who have questions, please call 650-903-6081 or email WaterQuality@mountainview.gov.

For questions specifically about the temporary lodging program, call 650-903-6081 and press 2. 

Stay Informed
To receive updates via email on the Cuesta Water Main Incident, subscribe to “City News” at MountainView.gov/eNotify.

For more information, including resources for residents, visit MountainView.gov/CuestaWaterMain.

Next Update
The City will issue the next incident update when new information is available.

Media Inquiries
For media inquiries, email Communications@mountainview.gov or call Lenka Wright, Chief Communications Officer, at 650-903-6615.

4 p.m. Thursday, May 7, 2026: Cuesta Water Main Incident 

“Super Chlorination” Process Underway
The “super chlorination” process continues for the pipelines that serve the Drucilla Drive/Carla Court area. The duration of the work will depend on test results following the chlorination process.

The City of Mountain View will keep affected residents updated on the schedule as more information is available.

About the Water Main Incident
On Wednesday, May 6, a “Boil Water” notice was lifted for 46 of the original 67 homes impacted by the Cuesta water main breach. Currently, 21 homes, located north of Cuesta Park, remain under boil water restrictions until further notice.

The water main breach involved a private contractor that was hired by the City. The Friday, April 24, incident concerned a contamination breach with some cement slurry mix coming into contact with a live water main near the intersection of Bonita Avenue and Cuesta Drive.

Questions or Assistance
For residents in the affected area who have questions, please call 650-903-6081 or email WaterQuality@mountainview.gov.

For questions specifically about the temporary lodging program, call 650-903-6081 and press 2.

Stay Informed
To receive updates via email on the Cuesta Water Main Incident, subscribe to “City News” at MountainView.gov/eNotify.

For more information, including resources for residents, visit MountainView.gov/CuestaWaterMain.

Next Update
The City will issue the next incident update when new information is available.

Media Inquiries
For media inquiries, email Communications@mountainview.gov or call Lenka Wright, Chief Communications Officer, at 650-903-6615.

10:30 a.m. Wednesday, May 6, 2026: Cuesta Water Main Incident

Boil Water Restriction Lifted for 46 Homes and Remains in Place for 21 Homes
On Wednesday, May 6, the City of Mountain View, in coordination with the California State Water Resources Control Board, lifted the “Boil Water” notice for 46 of the 67 homes impacted by a water main contamination breach, north of Cuesta Park. The water line serving these homes continues to test clear for coliform bacteria. View the “Termination of Boil Water Notice for Select Residences.”

The remaining 21 homes, located on Drucilla Drive and Carla Court, remain under a “Boil Water” notice until further notice.

View a map of the area below (or view map here), showing the homes that remain under a “Boil Water” notice and those homes for which the “Boil Water” notice has been lifted.

21 Homes in Drucilla Drive/Carla Court Area

Residents in 21 homes on Drucilla Drive (between Leona Lane and Montalto Drive) and Carla Court should continue to follow boil water restrictions due to the latest test results continuing to show low levels of coliform bacteria in the water line serving their homes. This means tap water must be boiled for at least 1 minute before drinking, food and drink preparation, making ice, brushing teeth, and other consumptive uses.  Bathing, showering, hand washing, and running a dishwasher and a clothes washer are approved for use with water directly from the tap.

The “super chlorination” process is now underway for the pipeline that serves the Drucilla Drive/Carla Court area. The duration of the work will depend on test results following the chlorination process. The City will keep affected residents updated on the schedule as more information is available.

The City will continue to provide hotel, meals and incidentals, and shower resources for these homes through Sunday, May 10 (hotel checkout available through Monday, May 11). Water delivery will continue through Wednesday, May 13, with extra days provided to ensure a smooth household transition.

46 Homes Outside the Drucilla Drive/Carla Court Area
The “Boil Water” notice has been lifted for 46 homes outside of Drucilla Drive and Carla Court. It is recommended that these households perform another flushing of the in-home water lines and fixtures, starting with the front yard spigot, prior to consuming water from your tap.  For flushing instructions, see HERE.

The City is providing plumbing services for those who need assistance with the flushing process. If you need assistance, please email WaterQuality@mountainview.gov or call 650-903-6081.

Due to the return to full water service for these 46 households, changes are coming to the emergency resources provided by the City.

• Wednesday, May 6, is the last night for temporary lodging paid for or reimbursed by the City.
• Wednesday, May 6, is the last day for meal and incidental expenses reimbursement.
• Wednesday, May 13, is the last day for drinking water, delivered by Water World.

Addressing Water Bill Concerns for Affected Residents
The City recognizes that homes affected by the water main emergency are experiencing increased water usage due to the need to flush household pipes and fixtures as part of the restoration of water service. The City will provide a 100% credit for water and sewer services for the entire two-month bill that includes the emergency period beginning on April 24, 2026. Residents can expect to receive this credit in the bill arriving in early July.

The bill for the two-month billing cycle prior to the emergency period is arriving soon. This bill reflects water usage and charges for between Feb. 10 and April 8, 2026, and does not include a credit.

For questions or concerns, utility customers from the impacted area can contact the City’s Utility Billing team at RevenueStaff@MountainView.gov or 650-903-6317, option 1.

Reports of Sediment in Tap Water
The City regularly tests for water quality parameters to ensure drinking water compliance. 

One parameter is “turbidity,” which is suspended particles in the water. Over time, it is not unusual for suspended particles to clump together to form sediment, which naturally falls to the bottom of the pipe. When pipes are flushed (especially with the very large flushing operations from last Thursday night/Friday morning), sediment can be stirred up into the main water stream.

In addition, some types of household plumbing, especially galvanized pipelines, can corrode over time and produce sediment at plumbing fixtures. 

If sediment is coming out of your fixtures, it is recommended that you flush the pipes until the water runs clear. 

For questions or concerns about sediment in your tap water, please call 650-903-6081 or email WaterQuality@mountainview.gov.

Questions or Assistance
For residents in the affected area who have questions, please call 650-903-6081 or email WaterQuality@mountainview.gov.

For questions specifically about the temporary lodging program, call 650-903-6081 and press 2.

Stay Informed
To receive updates via email on the Cuesta Water Main Incident, subscribe to “City News” at MountainView.gov/eNotify.

Next Update
The City will issue the next incident update when new information is available.

Media Inquiries
For media inquiries, email Communications@mountainview.gov or call Lenka Wright, Chief Communications Officer, at 650-903-6615.

6:40 p.m. Monday, May 4, 2026: Cuesta Water Main Incident

Temporary Water Shutoff for 18 Homes in Impacted Area 
In preparation for a “super chlorination” of the pipeline serving the Drucilla Drive/Carla Court area (Drucilla Drive between Leona Lane and Montalto Drive and all of Carla Court), there will be an approximate 6-hour water shutoff Wednesday, May 6, 9:00 a.m.-3:00 p.m.

The water shutoff allows West Valley Construction Co., the City’s contractor for this project, to establish temporary water lines so that each of these homes has access to water during a “super chlorination” process of the pipeline. The City of Mountain View will turn off the water for 18 homes on Drucilla Drive and Carla Court. View the Construction Notice. City crews will go door-to-door to notify affected households in advance of this brief water shutoff.

This “super chlorination” process is intended to address the presence of low levels of coliform bacteria, which appear to be concentrated in the water line serving homes on Drucilla Drive and Carla Court.

In coordination with the State Water Resources Control Board, the City is exploring the possibility of lifting the “Boil Water” notice for homes that are not on Drucilla Drive and Carla Court.

Boil Water Tips
Tonight, the “Boil Water” notice remains in effect for all 67 affected homes located just north of Cuesta Park.

The residents in the affected area (see map below) should not use their tap water for drinking and cooking unless it has been boiled for at least 1 minute first.
For more details, visit the Boiled Water Approved Uses webpage or watch this City video.

Updated Hours for Temporary Shower Access
The City will continue to provide temporary shower access for residents, who are impacted by the recent water main incident. The shower facilities are located at the Rengstorff Park Aquatics Center and El Camino YMCA. Their hours are listed below:

Rengstorff Park Aquatics Center

• Tuesday, May 5: 7:30 a.m.–1:00 p.m., 4:30–8:30 p.m.
• Wednesday, May 6: 7:30 a.m.–1:00 p.m., 6:30–8:30 p.m.
• Thursday, May 7: 7:30 a.m.–1:00 p.m., 4:30–8:30 p.m.
• Friday, May 8: 7:30 a.m.–1:00 p.m., 6:30–8:30 p.m.
• Saturday, May 9: 9 a.m.–2:00 p.m.
• Sunday, May 10: 9 a.m.–2:00 p.m.
• Monday, May 11: 7:30 a.m.–1:00 p.m., 6:30–8:30 p.m.

YMCA

• Tuesday, May 5 - Friday, May 8: 5:30 a.m.–9:00 p.m.
• Saturday, May 9: 7:00 a.m.-6:00 p.m.
• Sunday, May 10: 8:00 a.m.-5:00 p.m. 
• Monday, May 11: 5:30 a.m.-9:00 p.m. 

About the Water Main Incident
The water main breach involved a private contractor that was hired by the City. The Friday, April 24, incident concerned a contamination breach with some cement slurry mix coming into contact with a live water main near the intersection of Bonita Avenue and Cuesta Drive.

Questions or Assistance
For residents in the affected area who have questions, please call 650-903-6081 or email WaterQuality@mountainview.gov.

For questions specifically about the temporary lodging program, call 650-903-6081 and press 2.

Stay Informed
To receive updates via email on the Cuesta Water Main Incident, subscribe to “City News” at MountainView.gov/eNotify.

For more information, including resources for residents, visit MountainView.gov/CuestaWaterMain.

Next Update
The City will issue the next incident update when new information is available.

Media Inquiries
For media inquiries, email Communications@mountainview.gov or call Lenka Wright, Chief Communications Officer, at 650-903-6615.

9:15 p.m. Sunday, May 3, Update #2

“Super Chlorination” for Drucilla Drive and Carla Court
As reported in the Sunday, May 3, 3:55 p.m. Update, test results continue to show coliform bacteria in the water line serving homes on Drucilla Drive and Carla Court. 

Through Emergency Declaration procurement procedures, the City of Mountain View has engaged West Valley Construction Co., Inc., to begin the process for a “super chlorination” of the pipeline serving the Drucilla Drive/Carla Court area (Drucilla Drive between Leona Lane and Montalto Drive and all of Carla Court). This section of the pipeline serves 23 households.

The “super chlorination” process will involve the following steps:

1. Establish temporary water lines so that each house on Drucilla Drive and Carla Court has access to water during the chlorination period. Note: the “Boil Water” notice will still be in effect.
2. Excavate a hole to physically disconnect and isolate the water pipe at both ends of Drucilla Drive (at Leona Lane and Montalto Drive).
3. Inject a high concentration of chlorine into this closed section of water pipe.
4. Let the chlorine remain in this section for 24 hours.
5. Check whether the residual amount of chlorine in the pipe remains within standard levels.
6. Discharge the chlorinated water in the pipe to the sanitary sewer system.
7. Flush out the pipe section to rid excess chlorine above drinking water standards.
8. Take two rounds of water samples for bacteria, 12 hours apart, with results available in approximately 24 hours from sample time.
9. Once bacteria sampling results reflect that the pipe has been properly disinfected, reconnect the pipe ends at Druscilla Drive/Leona Lane and Druscilla Drive/Montalto Drive.

This work will only be done in the Drucilla Drive/Carla Court area, which is the location of recent positive tests for bacteria.

The work will begin Monday, May 4, in the morning. The duration of the work will depend on the results of the test of chlorine residual levels at Step 5 AND the test for the presence of bacteria at Step 8. The City will keep affected residents updated on the schedule as more information is available.

During the chlorination and testing process, water service will be maintained to the Drucilla Drive/Carla Court households through a temporary connection from a hydrant and above-ground lines. The “Boil Water” notice will remain in effect, and tap water must be boiled for at least 1 minute before drinking, food and drink preparation, making ice, brushing teeth and other consumptive uses.  Bathing, showering, hand washing, and running a dishwasher and clothes washer are approved directly from the tap.

For more information, view the State Water Resources Control Board’s Fact Sheet on What to Do During a Boil Water Advisory and the 3:55 p.m. Sunday, May 3, Update.

There will be a brief water shutoff to households on Druscilla Drive and Carla Court to make the transition from piped water to the temporary water system. City crews will go door-to-door to notify affected households in advance of this brief water shutoff. When the treated pipe segment is cleared to return to service, the Drucilla Drive/Carla Court households will be removed from the temporary above-ground water service and reconnected to the street main.

Druscilla Drive and Carla Court will remain open to through-traffic.

Other homes in the impacted area, north of Cuesta Park, will not be impacted by this work. The existing water service and existing “Boil Water” notice remain in place.

Latest Timeline for Boil Water Notice for Affected Homes
The City still does not anticipate fully lifting the “Boil Water” restrictions for the affected homes before the weekend of May 9 and 10.

The City will continue to provide resources to the affected residents, which include temporary lodging if needed; temporary shower access at the El Camino YMCA, Rengstorff Park Aquatics Center, and Eagle Park Pool; drinking water delivery service; and meal and incidental expenses reimbursement ($92 per day per resident; receipts are not needed for meals and incidentals).

About the Water Main Incident
The water main breach involved a private contractor that was hired by the City. The Friday, April 24, incident concerned a contamination breach with some cement slurry mix coming into contact with a live water main near the intersection of Bonita Avenue and Cuesta Drive.

Questions or Assistance
For residents in the affected area who have questions, please call 650-903-6081 or email WaterQuality@mountainview.gov.

For questions specifically about the temporary lodging program, call 650-903-6081 and press 2.

Stay Informed
To receive updates via email on the Cuesta Water Main Incident, subscribe to “City News” at MountainView.gov/eNotify.

For more information, including resources for residents, visit MountainView.gov/CuestaWaterMain.

Next Update
The City will issue the next incident update when new information is available.

Media Inquiries
For media inquiries, email Communications@mountainview.gov  or call Lenka Wright, Chief Communications Officer, at 650-903-6615.

3:55 p.m. Sunday, May 3, Update: It’s now Day 10 since a water main contamination emergency began impacting 67 homes in the neighborhood north of Cuesta Park. This localized area remains under a “Boil Water” notice. Outside the affected area, the water is safe for drinking and other uses throughout Mountain View. See map below.

Water Quality Testing Update
The latest water tests have come back positive for low levels of coliform bacteria in one area of the affected neighborhood where the private contractor, hired by the City of Mountain View, installed a new pipe as part of a water main replacement and upgrade project. The latest water tests remain negative for E. Coli.

At this time, the positive test results appear to be concentrated in the water line serving homes on Drucilla Drive and Carla Court.

The City, in coordination with regulatory partners, is actively evaluating a range of potential remedial actions to fully restore safe drinking water to the affected area.

Latest Timeline for Boil Water Notice for Affected Homes
In close coordination with the California State Water Resources Control Board, the City does not anticipate fully lifting the “Boil Water” restrictions for the affected homes before the weekend of May 9 and 10.

The City will continue to provide resources to the affected residents, which include temporary lodging if needed; temporary shower access at the El Camino YMCA, Rengstorff Park Aquatics Center, and Eagle Park Pool; drinking water delivery service; and meal and incidental expenses reimbursement ($92 per day per resident; receipts are not needed for meals and incidentals).

The City thanks the affected residents for their patience and understanding during this challenging time. Rest assured, all City resources available for this localized emergency are being dedicated to restoring safe drinking water services to the affected area as soon as possible.

Boil Water Notice in Impacted Area
The “Boil Water” Notice is in effect for the affected area, north of Cuesta Park, until further notice.

For affected residents, here is a list of do’s and don’ts for tap water usage, after their household plumbing has been flushed, in accordance with the “Boil Water” notice instructions:

 What you can do with water from the tap:

• Take a bath and shower
• Wash hands
• Use laundry machine for washing clothes
• Run a dishwasher

What you can do with water that has been boiled following “Boil Water” notice instructions:

• Drink and cook
• Prepare other drinks (coffee, tea, lemonade)
• Wash produce
• Wash food prep areas
• Make ice
• Brush teeth

Tap water that has not been boiled for at least 1 minute should not be used for drinking and cooking.

For more information, view the State Water Control Board’s Fact Sheet on What to Do During a Boil Water Advisory.

About the Water Main Incident 
The water main breach involved a private contractor, C2R Engineering, hired by the City. The Friday, April 24, incident concerned a contamination breach with some cement slurry mix coming into contact with a live water main near the intersection of Bonita Avenue and Cuesta Drive.

Questions or Assistance
For residents in the affected area who have questions, please call 650-903-6081 or email WaterQuality@mountainview.gov. 

For questions specifically about the temporary lodging program, call 650-903-6081 and press 2.

Stay Informed 
To receive updates via email on the Cuesta Water Main Incident, subscribe to “City News” at MountainView.gov/eNotify.

Next Update
The City will issue the next incident update when new information is available.

Media Inquiries
For media inquiries, email Communications@mountainview.gov or call Lenka Wright, Chief Communications Officer, at 650-903-6615.

10:30 p.m. Friday, May 1, Update #2: Tonight, approximately 67 households, north of Cuesta Park, that were impacted by a water main breach are now under a "Boil Water" notice.

The affected residents received the updated notice during Friday evening's neighborhood meeting, hosted by the City of Mountain View. The "Boil Water' notice is an improvement from the "Unsafe Water Alert - Do Not Use Your Water' advisory that has been in effect for Cuesta Drive (600 block), Leona Lane (600-700 block), Montalto Drive, Drucilla Drive, and Carla Court. This latest order came following a week of water quality monitoring and pipeline inspection and flushing.

These households are being advised that they may now use boiled tap water or bottled water for drinking and cooking purposes. View the new "Boil Water notice.

The City anticipates a status update on fully restoring water services in the coming days. The water main contamination incident near the intersection of Cuesta Drive and Bonita Avenue involved a contractor, hired by the City, who was conducting water replacement activities.

Stay Informed
To receive updates via email on the Cuesta Water Main Incident, subscribe to “City News” at MountainView.gov/eNotify.

Next Update
The City will issue the next incident update when new information is available.

Media Inquiries
For media inquiries, email Communications@mountainview.gov  or call Lenka Wright, Chief Communications Officer, at 650-903-6615. 

12:15 p.m. Friday, May 1, Update: It’s now been one week since a water main contamination emergency began impacting approximately 67 households in the neighborhood north of Cuesta Park.  Thank you to these residents for their patience with the construction overnight as City crews inspected waterlines and performed flushing work.

Neighborhood Meeting 
This is a reminder that the City of Mountain View is holding a neighborhood meeting tonight, May 1, for the residents impacted by the water main contamination incident north of Cuesta Park. 

This meeting is for these residents only. The City has invited the affected residents directly to this gathering. The City is providing child care services for children, who are three-years-old and older and can use the bathroom independently.

Meal and Incidental Expenses Reimbursement
The City is currently collecting information from affected residents in order to provide reimbursement for meal and incidental expenses on a per diem basis, in accordance with federal reimbursement rates ($92 per day per resident; receipts are not needed for meals and incidentals).

Temporary Lodging Available for Impacted Residents 
The City is providing temporary lodging with several hotels through Monday, May 4. They include:

• Ameswell Hotel, 800 Moffett Blvd, Mountain View, CA | Phone: 650-880-1000 | Pet Friendly 
• Days Inn Mountain View, 850 Leong Dr, Mountain View, CA |Phone: 408-915-3669  
• Extended Stay America Suites, 190 E El Camino Real, Mountain View, CA | Phone: 650-962-1500 | Kitchens | Pet Friendly 
• Ramada by Wyndham Mountain View, 55 Fairchild Dr, Mountain View, CA | Phone: 650-967-6856  
• Shashi Hotel Mountain View, 1625 N Shoreline Blvd, Mountain View, CA| Phone: 650-420-2600 | Pet Friendly  
• Super 8 Mountain View, 1665 W El Camino Real, Mountain View, CA | Phone: 650-969-9641  
• TownePlace Suites, 606 S. Bernardo Avenue, Sunnyvale, CA | Phone: 408-733-4200 | Kitchens | Pet Friendly

Alternatively, the City will reimburse impacted residents up to $192+tax/night if they choose to use a different hotel of their choice.

For any lodging questions, please call 650-903-6081 and press 2.

Stay Informed
To receive updates via email on the Cuesta Water Main Incident, subscribe to “City News” at MountainView.gov/eNotify.

For more information, including resources for residents, visit MountainView.gov/CuestaWaterMain.  

Next Update
The City will issue the next incident update when new information is available.

Media Inquiries
For media inquiries, email Communications@mountainview.gov  or call Lenka Wright, Chief Communications Officer, at 650-903-6615.

5:45 p.m. Thursday, April 30, Update #2

Temporary Shower Access for Impacted Residents
The City of Mountain View has partnered with the YMCA of Silicon Valley to provide temporary shower access at the El Camino YMCA located at 2400 Grant Road for residents affected by the recent water main incident north of Cuesta Park. Impacted residents may begin accessing these showers today, April 30.

Shower Hours for the El Camino YMCA

• Monday-Friday - 5:30 a.m. - 9 p.m.
• Saturday - 7 a.m. - 6 p.m.
• Sunday - 8 a.m. - 5 p.m.

What You Need To Do

• Bring a valid government-issued photo ID
• Sign the YMCA's guest waiver form

Important Notes

• Shower access is available for eligible residents only.
• Please inform the front desk that you are a resident impacted by the Cuesta Water Main Incident.

Shower Access at City Facilities
The City continues to offer shower access at both the Rengstorff Park Aquatics Center and Eagle Park Pool for residents affected by the recent incident. Visit MountainView.gov/CuestaWaterMain for the current schedule.

Road Work Alert
This evening, April 30, water crews are making modifications to the water pipe on Carla Court. Water will be turned off on Carla Court, and traffic is closed on the street.

In addition, crews are using a specialized truck to conduct high-velocity flushing to achieve more aggressive cleaning of the pipelines in the impacted area. Other temporary street or lane closures may be required to safely perform the work. The City recognizes the disturbance this may cause and asks for patience and understanding as the City works diligently to resolve the issues.

1:00 p.m. Thursday, April 30, Update 

This is now Day 7 of the water main contamination emergency affecting approximately 67 households in the neighborhood north of Cuesta Park.  About 170 residents have been without drinkable water since Friday, April 24. The water main contamination incident near the intersection of Cuesta Drive and Bonita Avenue involved a contractor, hired by the City, who was conducting water replacement activities.

Neighborhood Meeting 
The City of Mountain View is holding a neighborhood meeting on Friday, May 1, for the residents impacted by the water main contamination incident north of Cuesta Park.

This meeting is for these residents only. The City is inviting the affected residents directly to invite them to this gathering.

Water Bottle Recycling Questions
The City is aware that recycling bins may not be big enough to accommodate all the water bottles being used during this situation.

Residents can put out  extra bags next to their recycling bins on their normal pick-up day. While paper bags, cardboard boxes, or reusable bins are preferred, plastic bags can be used as long as there is a note on them that says “recycle.”

Residents can also drop off their plastic bottles at the Mountain View Recycling Center, 935 Terra Bella Ave.

Contact Information for Affected Residents 
Residents needing assistance can call 650-903-6081 or email waterquality@mountainview.gov.

For questions about the temporary lodging program, call 650-903-6081 and press 2.

Stay Informed
To receive updates via email on the Cuesta Water Main Incident, subscribe to “City News” at MountainView.gov/eNotify.

Next Update
The next incident update is scheduled for 12:00 p.m. Friday, May 1.

7:50 p.m. Wednesday, April 29, Update

The City of Mountain View now has frequently asked questions available (FAQs) regarding the water main emergency impacting approximately 67 households north of Cuesta Park. View the FAQs.  

Message from the Mayor 

On Wednesday, April 29, Mayor Emily Ann Ramos provided a message to the residents impacted by the "Do Not Drink" order and the rest of the Mountain View community.

View Mayor Ramos' video message. 

5:30 p.m. Wednesday, April 28, Update

Construction and Road Impacts
In response to the water main emergency affecting approximately 67 households near Mountain View’s Cuesta Park, there is now road construction underway for pipeline inspection in the impacted area today at the intersection of Cuesta Drive and Bonita Avenue. A map of the road construction can be viewed here.

The “Do Not Use” order is isolated for an area just north of Cuesta Park. The water is turned on for flushing toilets only. With new direction from the State Water Resources Control Board, water can be used for irrigating lawns and watering ornamental and non-edible plants.

Restoration of Water Services Update
At this time, the City of Mountain View is preparing for the possibility that the clearance by the California State Water Resources Control Board to restore drinking water will not happen before Sunday, May 3.

With each day’s complex and iterative testing and interaction with the State Water Board, the City receives additional information about the status of the water in the affected area and what actions and information the State Water Board requires before it can lift the current “Do Not Drink” order. Only the State can lift this order, and the City does not currently know how long this will take.

The City will continue to provide hotel accommodations (hotel check-out on Monday, May 4) and per diem reimbursement for meals and incidental expenses through Sunday, May 3.

Neighborhood Meeting
The City will contact the residents impacted by the water main contamination incident directly to invite them to the neighborhood meeting. This meeting, which is taking place on Friday, May 1, is for these residents only.

Emergency Water Supplies for Residents
To ensure every household has access to clean water during the ongoing water main emergency, the City is partnering with Water World to deliver water supplies directly to affected household’s front door starting tomorrow, April 30.

Your Water Kit: Each residence will receive three 5-gallon jugs of water and a hand pump.

Scheduling Your Delivery: Deliveries require someone to be present. To coordinate a specific time or provide delivery instructions, please call Water World at 408-641-5440.

Staying Supplied: Exchanging empties is easy! Just place your empty jugs outside your front door, and Water World will swap them for full ones. You can also call Water World to notify them that you are ready for a refill.

Need Water Now? If you miss your delivery or need immediate supplies, additional jugs and pumps are staged and ready for pickup at Fire Station 2 (160 Cuesta Dr.) Fire station pickup is dependent on fire company availability, pending emergency incident response. You may call Fire Station 2 at 650-903-6340 to confirm if they are present.

Stay Informed  
To receive updates via email on the Cuesta Water Main Incident, subscribe to “City News” at MountainView.gov/eNotify.

Next Update 
The next incident update is scheduled for 1 p.m. Thursday, April 30.

Media Inquiries 
For media inquiries, email Communications@mountainview.gov  or call Lenka Wright, Chief Communications Officer, at 650-903-6615.

8:00 p.m. Tuesday, April 28, Update

Neighborhood Meeting 
The City of Mountain View will hold a neighborhood meeting for the residents whose access to drinking water has been impacted by the Cuesta Park area water main incident. The meeting will be held on the evening of Friday, May 1. More details will be announced soon.

Meal and Incidental Expenses Reimbursement
The City is currently collecting information from affected residents in order to provide reimbursement for meal and incidental expenses on a per diem basis, in accordance with federal reimbursement rates ($92 per day per resident). A form is being developed and will be shared with these residents soon. 

Temporary Lodging Available for Impacted Residents
The City is providing temporary lodging with several hotels through Monday, May 4. They include: 

• Super 8 Mountain View, 1665 W El Camino Real, Mountain View, CA | Phone: 650-969-9641 
• Ramada by Wyndham Mountain View, 55 Fairchild Dr, Mountain View, CA | Phone: 650-967-6856 
• Days Inn Mountain View, 850 Leong Dr, Mountain View, CA |Phone: 408-915-3669 
• Shashi Hotel Mountain View, 1625 N Shoreline Blvd, Mountain View, CA| Phone: 650-420-2600 
• TownePlace Suites, 606 S. Bernardo Avenue, Sunnyvale, CA | Phone: 408-733-4200

More hotels may be added to the list. In particular, the City is seeking to add hotel(s) with kitchen facilities. Alternatively, the City will reimburse impacted residents up to $192+tax/night if they choose to use a different hotel of their choice.

For any questions, please call 650-903-6081 and press 2.

Shower Facilities
The residents affected by the water shutoff may continue to use the shower facilities at Rengstorff Park Aquatics Center and Eagle Park Pool. The pool facility hours are, as follows:

• Rengstorff Park Aquatics Center, 2073 Crisanto Ave. 
  • Wednesday, April 29 
    • 6:00 a.m.-1:00 p.m.
    • 6:30-8:30 p.m.
  • Thursday, April 30 
    • 6:00 a.m.-1:00 p.m.
    • 4:30-8:30 p.m. 
  • Friday, May 1 
    • 6:00 a.m.-1:00 p.m.
    • 6:30-8:30 p.m.
  • Saturday, May 2 
    • 7:00 a.m.-2:00 p.m. 
    • 5:00-8:00 p.m.
  • Sunday, May 3 
    • 7:00 a.m.-1:00 p.m. 
    • 5:00-8:00 p.m.
  • Monday, May 4
    • 6:00 a.m.-1:00 p.m.
    • 6:30-8:30 p.m.

• Eagle Park Pool, 650 Franklin St. 
  • Wednesday, April 29 - Friday, May 1 
    • 7:00-9:00 p.m.
  • Saturday, May 2 and Sunday, May 3
    • 5:00-8:00 p.m. 
  • Monday, May 4
    • 7:00-9:00 p.m.    

The City is also exploring the ability for affected residents to use the showers at the YMCA. An update will be provided when available.   

About the Incident
Approximately 67 households near Cuesta Park remain under a “Do Not Drink” order following a water main contamination incident involving a contractor on Friday, April 24. The water in the affected area is turned on for toilet flushing use only. The City is taking all required steps to have safe drinking water access restored as quickly as possible.

Stay Informed
To receive updates via email on the Cuesta Water Main Incident, subscribe to “City News” at MountainView.gov/eNotify.

Next Update
The next incident update is scheduled for 4:00 p.m. Wednesday, April 29.

View the latest Water Main Incident Update flyer that was shared with residents.

11:00 a.m. Tuesday, April 28, Update: In response to the water main contamination incident near Cuesta Park, the affected households have been under a “Do Not Drink” order. When limited water service was restored for toilet use, residents were required to flush their plumbing systems to clear potentially contaminated water.

Many residents have expressed concern about higher water bills resulting from this process. The City of Mountain View is currently evaluating options to offset these additional costs incurred as part of the emergency response.

At this time, approximately 67 households remain under the “Do Not Drink” order, with water service restricted to toilet use only.

Next Update
The next incident update is scheduled for 8:00 p.m. Tuesday, April 28.

Media Inquiries
For media inquiries, email Communications@mountainview.gov or call Lenka Wright, Chief Communications Officer, at 650-903-6615.

10:00 p.m. Monday, April 27, Update: The City of Mountain View has declared a State of Emergency for the Cuesta Park area water main incident.

The emergency declaration was made on Saturday, April 26, and the City Council will ratify the declaration at their Tuesday, April 28, meeting. This declaration will allow the City to seek reimbursement from the State of California and federal government for expenses related to this incident, to the extent allowed by law.

Since Friday night (4/24/26), the City’s Emergency Operations Center has been activated, which opens up more resources for responding to the incident.

Approximately 67 households remain under a “Do Not Drink” order tonight (view updated map below). The water in the affected area is turned on for toilet flushing use only.

The “Do Not Drink” order is isolated for the area near Cuesta Park. The water in the rest of Mountain View continues to meet state and federal quality standards.

In addition to flushing the water main in the street, City crews have flushed each affected property’s water service to their front yard. City crews went to each affected household to provide written guidance on how to flush the indoor house plumbing and answer resident’s questions. On Monday, crews conducted more comprehensive drinking water safety testing.

Restoring safe drinking water to the affected area is anticipated for mid-to-end of the week, pending test results of the latest water samples and approval by the State Water Resources Control Board. On Sunday, April 26, two of the five water samples came back positive for bacteria. The tests were for coliform and E. Coli. The lab has indicated that E. Coli was not present in the samples and that coliform was present in two of the five samples. 

The water main incident happened on Friday, April 24, when the contractor, C2R Engineering, was performing water main replacement activities at the intersection of Cuesta Drive and Bonita Avenue.

Temporary Lodging Available for Impacted Residents

The City has partnered with several local hotels to provide temporary lodging for residents impacted by the recent incident.

If you need a place to stay during the impact period, you may contact one of the following locations (all accommodations are subject to each hotel’s availability):

1. Super 8 Mountain View, 1665 W El Camino Real, Mountain View, CA | Phone: 650-969-9641
2. Ramada by Wyndham Mountain View, 55 Fairchild Dr, Mountain View, CA | Phone: 650-967-6856
3. Days Inn Mountain View, 850 Leong Dr, Mountain View, CA | Phone: 408-915-3669
4. Shashi Hotel Mountain View, 1625 N Shoreline Blvd, Mountain View, CA | Phone: 650-420-2600
5. TownePlace Suites, 606 S. Bernardo Avenue, Sunnyvale, CA | Phone: 408-733-4200

What You Need to Bring:

1.  A valid government-issued photo ID
2. The ID must show an address that matches the impacted residence
3. A credit card for incidental charges

Important Notes:

1. Hotel accommodations are available for eligible residents only.
2. Room availability is not guaranteed and will depend on each hotel’s current occupancy.
3. Please inform the front desk that you are part of the City’s temporary lodging program when checking in.

Ongoing Hotel Coordination:

The City continues to work with additional local hotels and motels to expand available lodging options. Updates will be provided as new locations are confirmed and added to the list.

Alternatively, the City will reimburse impacted residents up to $192+tax/night if they choose to use a different hotel of their choice.

Questions or Assistance:

If you have any questions, please call 650-903-6081 and press 2.

Next Update

The next incident update is scheduled for 11:00 a.m. Tuesday, April 28.

Media Inquiries

For media inquiries, email Communications@mountainview.gov or call Lenka Wright, Chief Communications Officer, at 650-903-6615.

8:45 p.m. Sunday, April 26, 2026 Update: The households affected by Friday’s water main incident near Cuesta Park should be prepared for being without tap water for drinking, cooking, hand washing, bathing, and other domestic uses through mid-to-end of the week. As of Sunday night, nearly all of the homes now have their water turned back on for toilet flushing only. 

The extended timeline for restoring safe drinking water is due to two of the five water samples coming back positive for bacteria. The crews are resuming flushing activities with the intent to rid the isolated system of the bacteria. On Sunday night and Monday morning, the City of Mountain View water utility crews will follow State Water Resources Control Board’s instructions to conduct additional comprehensive drinking water safety testing.

Following all standard protocols, the City is closely coordinating with the State regulators to ensure safe water service is restored as quickly as possible.

Please see the updated map below of the affected area, which has been revised to show 65 affected homes total. Two homes, located on Leona Lane, have been removed due to those homes receiving water from a non-impacted water main. 

For assistance, affected residents can call 650-903-6081 or email WaterQuality@mountainview.gov.

Temporary Lodging Available for Impacted Residents
The City has partnered with four local hotels to provide temporary lodging for residents impacted by the recent incident. If you desire to stay in a hotel during the impact period, you may stay at one of the following locations:

• Super 8 Mountain View, 1665 W El Camino Real, Mountain View, CA, Phone: 650-969-9641 
• Ramada by Wyndham Mountain View, 55 Fairchild Dr, Mountain View, CA, Phone: 650-967-6856 
• Days Inn Mountain View, 850 Leong Dr, Mountain View, CA, Phone: 408-915-3669
• The Ameswell Hotel (pet-friendly-extra fee), 800 Moffett Blvd, Mountain View, CA, Phone: 650-880-1000 

What you need to bring:

•  A valid government-issued photo ID 
• The ID must show an address that matches the impacted residence 
• A credit card for incidental charges 

Important Notes:

• Hotel accommodations are available for eligible residents only. 
• Availability may vary by location.
• Please inform the front desk that you are part of the City’s temporary lodging program when checking in. 

Questions or Assistance:
If you have any questions, please call 650-903-6081 and press 2.

About the Water Main Incident
The water main incident, near the intersection of Bonita Avenue and Cuesta Drive, involved a City contractor working on a water main replacement and upgrades project on Friday, April 24. The incident involved a contamination breach with some cement slurry mix coming into contact with a water main, requiring the water supply in the affected area to be shut off.

For the latest updates, visit MountainView.gov/CuestaWaterMain. 

2:35 p.m. Sunday, April 26, Update: As of this afternoon, approximately 75% of the 67 homes affected by the water main incident near Cuesta Park now have their water turned back on for toilet flushing only. 

As comprehensive drinking water safety testing continues, these residents should be prepared for being without tap water for drinking, cooking, hand washing, bathing, and other domestic uses through at least Monday, April 27, or longer. For assistance, including hotel information, affected residents can call 650-903-6081 or email WaterQuality@mountainview.gov.

The residents affected by the water shutoff may continue to use the shower facilities at Rengstorff Park Aquatics Center, 2073 Crisanto Ave., and Eagle Park Pool, 650 Franklin St. The pool facility hours are, as follows:

• Rengstorff Park Aquatics Center
  • Monday, April 27
    • 6:00 a.m.-1:00 p.m.
    • 6:30-8:30 p.m.
  • Tuesday, April 28
    • 6:00 a.m.-1:00 p.m.
    • 4:30-8:30 p.m.
  • Wednesday, April 29
    • 6:00 a.m.-1:00 p.m.
    • 6:30-8:30 p.m.
• Eagle Park Pool
  • Monday, April 27 - Wednesday, April 29
    • 7:00-9:00 p.m.

11:10 a.m. Sunday, April 26, Update: As of this morning, approximately two-thirds of the 67 homes affected by the water main incident near Cuesta Park have their water turned back on for toilet flushing only.

City of Mountain View water utility crews continue to go door-to-door to speak with the affected residents to provide instructions for flushing household plumbing before turning on the water. Only toilet flushing is allowed.

The affected households are not to use tap water for drinking, cooking, hand washing, or bathing until further notice. Toilet flushing only is allowed.

If the resident is not present when City crews come by, they should contact 650-903-6081 to have their water turned on.

The crews remain onsite, flushing the system and conducting water quality testing. As of Sunday morning, the comprehensive drinking water safety testing is not expected to be completed until at least Monday, April 27. The City is working closely with the State Water Resources Control Board regulators to restore safe drinking water as soon as possible.

Residents needing assistance should call 650-903-6081 or email WaterQuality@mountainview.gov.

Friday's water main incident, near the intersection of Bonita Avenue and Cuesta Drive, involved a City contractor working on a water main replacement and upgrades project. There was a contamination breach with some cement slurry mix getting into a water main, which required the water supply in the affected area to be shut off.

10:15 p.m. Saturday, April 25, Update:  On Saturday, April 25, the City of Mountain View issued a "Do Not Use Water" notice to provide instructions for flushing household plumbing for the area affected by the water main incident near Cuesta Park. View the notice.

The affected households are not to use tap water for drinking, cooking, hand washing, or bathing until further notice. Toilet flushing only is allowed. 

If the resident is present when City staff delivers this latest notice, their water will be turned on. If they are not present, the resident should contact 650-903-6081 to have their water turned on.

8:15 p.m. Saturday, April 25, Update: On Friday, April 24, the City of Mountain View issued a “Do Not Use Water” notice to the area affected by the water main incident near Cuesta Park. View the notice. Future public notices for this incident will be made available on the Notices webpage.

Residents needing assistance, including hotel information, should call 650-903-6081 or email WaterQuality@mountainview.gov.

Friday's water main incident near the intersection of Bonita Avenue and Cuesta Drive involved a City contractor working on a water main replacement and upgrades project.

1:00 p.m. Saturday, April 25, Update: As of Saturday, April 25, approximately 67 households near Cuesta Park remain under a Do Not Use Water notice. Residents in the affected area must not use tap water for any purpose until the notice is lifted.

This means affected residents should not use tap water for drinking, cooking, handwashing, bathing, brushing teeth, washing dishes, or any other household use.

City of Mountain View water utility crews are on site flushing the system and conducting water quality testing. If initial test results confirm the water is safe for limited non-drinking uses, such as flushing toilets, the City will contact each affected household directly with instructions and required steps before service is restored. This update is expected Saturday afternoon.

Comprehensive drinking water safety testing is not expected to be completed until at least Monday, April 27. The City is offering hotel stays for the affected residents who need it. City staff remain in close coordination with State Water Resources Control Board regulators to restore safe water service as quickly as possible.

Residents needing assistance should call 650-903-6081 or email WaterQuality@mountainview.gov. Additional updates are available on the City website.

This notice follows a water main incident involving a City contractor on Friday, April 24, which caused a contamination breach and required the water supply in the affected area to be shut off.

11:45 a.m. Saturday, April 25, Update: For this evening, shower facilities at Eagle Park Pool, 650 Franklin St., are also available to affected residents on Saturday and Sunday, 5:00-8:00 p.m.

7:30 a.m. Saturday, April 25, Update: For residents affected by the water shutoff near Cuesta Park, they may use the shower facilities at Rengstorff Park Aquatics Center. For Saturday and Sunday, the Aquatics Center's shower facilities are available 9:00 a.m.-1:00 p.m.

6:30 a.m. Saturday, April 25, Update:  The residents who are affected by the water shutoff near Cuesta Park can utilize the shower facilities that are available at Rengstorff Park Aquatics Center, 2073 Crisanto Ave. Restrooms at the Mountain View Public Library, 585 Franklin St., are also available for their use. The City of Mountain View is also offering hotel stays for those who need it.

Approximately 67 households have their water shut off due to the Friday, April 24, water main incident involving a City contractor near Cuesta Park.

11:30 p.m. Friday, April 24, Update:  The City of Mountain View is continuing to respond to Friday’s water main incident that forced the water to be shut off to approximately 75 households near Cuesta Park.

The City has issued a “Do Not Use Water” to the affected area. The State Water Resources Control Board and the City are advising these residents to not use the tap water for drinking, cooking, handwashing, or bathing until further notice. The streets affected are portions of Cuesta Drive (600 block), Leona Lane (600-700 block), Montalto Drive, Drucilla Drive, and Carla Court.

On Friday evening, City crews were distributing two cases of bottled water to each affected household. In addition, City of Mountain View Fire Department personnel were also going door-to-door to check on affected residents and their needs.

For assistance, affected residents can call 650-903-6081 or email WaterQuality@mountainview.gov.

The City is working closely with State of California regulators to ensure the safety of the drinking water. At this time, the City anticipates the water will remain turned off for at least another day.

5:30 p.m. Friday, April 24, Update: Approximately 75 City of Mountain View water utility customers near Cuesta Park have their water shut off following a construction incident involving a City contractor working on a water main. The incident involves a water main contamination breach near the intersection of Bonita Avenue and Cuesta Drive. On Friday, April 24, the contractor was performing work when some slurry mix came into contact with the live water main. As soon as the City became aware of the situation, City crews began shutting off the water to the affected households.

The streets that are affected by the temporary water shutoff are Cuesta Drive, Leona Lane, Montalto Drive, Drucilla Drive, and Carla Court.

The City is working closely with State of California regulators on a water flushing plan. At this time, the City anticipates that water will be restored within a few hours later tonight.

View this update in Spanish and Chinese.

4:15 p.m. Friday, April 24, Update: Approximately 75 households are currently affected by the water main incident. More details are coming soon.

2:50 p.m. Friday, April 24, Update: City of Mountain View crews are responding to an incident involving a water main in the Bonita Avenue and Cuesta Drive area this afternoon.

As a precaution, crews are shutting off the water to the affected residents. Staff is currently assessing the number of affected households. At this time, it’s undetermined how long the water will be shut off.

More information will be shared as it becomes available. For the latest updates, visit MountainView.gov.