Two Temporary Shutdowns Beginning in October for System Improvements

Duration: 10/19/26 – 3/31/27
Affected Areas: Zones impacted include but are not limited to:  Alum Rock, Batista, Clayton, Cambrian, Columbine, Crothers, Dow, Dutard, Miguelito, Perie, Pleasant Vista, Sweigert, Sierra, Tybalt and Upper Northwood

Both shutdowns are part of ongoing system improvements by our wholesale water provider, Valley Water.

Penitencia WTP will undergo a temporary shutdown starting on 10/19, followed by the East Pipeline starting on 11/02. This is to allow for essential work, including line valve installation at Penitencia Creek, pipeline inspections and repairs, appurtenance rehabilitation, and other routine maintenance upgrades. Santa Teresa will remain online and supplying a southern portion of this area. 

Duration: 10/29/26 – 4/28/27
Affected Areas: Zones impacted include but are not limited to:  More, Regnart, Prospect, Mercedes, Cristo Rey, Mann, Regnart Heights, Regnart Canyon, Picea Court, Saratoga Hills, Pike, Lumbertown, Vickery, Overlook, and Mt. Springs

The West Pipeline (from the Rinconada Water Treatment Plant) will undergo a temporary shutdown. This is to allow for essential work, including line valve installation at Stevens Creek Blvd, Cupertino and Madera Dr, Cupertino, pipeline inspections and repairs, appurtenance rehabilitation, and other routine maintenance upgrades.

During this time, some affected areas will be sourced from groundwater supplies that are disinfected using free chlorine instead of chloramine. Groundwater naturally contains higher mineral levels, which may lead to increased water hardness.

What to Expect:

• Disinfection Change: The water will be treated with free chlorine instead of chloramine. Some customers may notice a temporary difference in taste and odor.
• Water Hardness Increase: Groundwater contains higher levels of calcium and magnesium, which may result in more noticeable mineral deposits on fixtures and appliances.
• Continued Water Safety: The water will continue to meet or exceed all state and federal drinking water standards.
  
  

Customer Considerations:

• Customers with fish tanks, dialysis equipment, or specialized water needs should adjust their treatment systems to accommodate the temporary disinfection change.
• Appliance & Fixture Care: To reduce mineral buildup, customers may consider using a water softener or descaling agents as needed.

For questions or concerns, please contact our Customer Service team at (408) 279-7900 or WQ_Customer_Response@sjwater.com for more details.