Monday, May 11, 2026: Cuesta Water Main Incident

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.