5:30 p.m. Friday, May 15, 2026: Cuesta Water Main Incident

City of Mountain View sent this bulletin at 05/15/2026 05:43 PM PDT

5:30 p.m. Friday, May 15, 2026: Cuesta Water Main Incident

Water Samples Taken Near Home Meters Clear of Bacteria; Bacteria Traces Continue at One Hydrant Site

Water Samples Taken Near Home Meters Clear of Bacteria; Bacteria Traces Continue at One Hydrant Site
Post Date: 05/15/2026 5:19 p.m.

5:30 p.m. Friday, May 15, 2026: Cuesta Water Main Incident 

Water Samples Taken Near Home Meters Clear of Bacteria; Bacteria Traces Continue at One Hydrant Site 
On Tuesday, May 12, water samples taken at street-side service lines near the water meters at homes in the affected area, north of Cuesta Park, came back clear of bacteria. The fire hydrant near 679 Drucilla Drive tested positive for bacteria and has been disconnected from the system as testing continues. 

Pipeline Pigging is Complete; Disinfection and Testing Continue 
On Thursday, May 14, the City of Mountain View completed the “pipeline pigging” along Drucilla Drive and Carla Court. This mechanical pipeline cleaning method utilized multiple “pigs” through the pipeline from several access points located along Drucilla Drive and Carla Court.

In the morning of May 15, another “super chlorination” process was underway to disinfect the pipeline, which is required after pipeline pigging. Water samples will be taken following the disinfection and again after the end of the pipe is reconnected at Drucilla Drive and Montalto Drive. The reconnection of the pipe will involve construction activity and an intermittent closure of Montalto Drive on Saturday, May 16.  

This multi-step process of pipe disinfection, reconnection, testing, assessment, and coordination with the State Water Board is expected to take three to five days.

Cuesta Main Water Pipeline 5_14_26 30

Updated Dates and Times for Temporary Shower Access 
The City will continue to provide temporary shower access to the residents who remain impacted by the water main incident. The shower facilities are located at the Rengstorff Park Aquatics Center and El Camino YMCA. Access to showers at the YMCA will end after Monday, May 18, due to lack of use. Facility hours are listed below: 

Rengstorff Park Aquatics Center 

  • 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. 

  • Tuesday, May 19: 7:30 a.m.–1:00 p.m., 4:30–8:30 p.m. 

  • Wednesday, May 20: 7:30 a.m.–1:00 p.m., 6:30–8:30 p.m. 

  • Thursday, May 21: 7:30 a.m.–1:00 p.m., 4:30–8:30 p.m. 

  • Friday, May 22: 7:30 a.m.–1:00 p.m., 6:30–8:30 p.m. 

YMCA 

  • Friday, May 15: 5:30 a.m.–9:00 p.m. 

  • Saturday, May 16: 7:00 a.m.-6:00 p.m. 

  • Sunday, May 17: 8:00 a.m.-5:00 p.m.  

  • Monday, May 18: 5:30 a.m.-9:00 p.m.  

Temporary Lodging Available for Impacted Residents 
The City is providing temporary lodging with several hotels until otherwise communicated. 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. 

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