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

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.

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

YMCA

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

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 [email protected].

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 [email protected] or call Lenka Wright, Chief Communications Officer, at 650-903-6615.