Monday, May 4, 2026 Update #2: Cuesta Water Main Incident

6:45 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 [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.