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    Banner showing a reservoir at sunset with the headline “Protect Our Reservoirs.” It warns that golden mussels threaten local recreation and urges boaters and anglers to “Clean. Drain. Dry.” Icons show prohibited wet live bait (fish, crayfish, mussels) and steps to stop the spread: remove plants, drain water, and wipe down equipment. Footer includes ValleyWater.org/GoldenMussels and logos for Santa Clara County Parks and Valley Water.
    April 3, 2026
    Golden mussels in California: What Santa Clara County needs to know

    California’s water infrastructure is facing a new threat—one that’s tiny, invasive, and alarmingly fast-spreading. Golden mussels, native to Asia, were first detected in the Delta in 2024 and have spread to several California waterbodies hydrologically connected to the Sacramento-San Joaquin Delta, including San Luis Reservoir. These invaders pose a serious risk to water delivery systems across the state, including those serving Santa Clara County.

    Why golden mussels are a threat

    Read More
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    March 27, 2026
    Calling young creators: Inspire water conservation in our Every Drop Counts video contest

    By the Valley Water Youth Commission 

    How would you inspire your community to save water in just 60 seconds? That’s the challenge for middle and high school students in our Every Drop Counts Video Contest. 

    We are hosting our first-ever video contest for middle and high school students, and the theme is water conservation. Students are invited to grab the mic, show off their creativity, and inspire their community to protect one of our most important resources, water! 

    Read More
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    March 25, 2026
    Statement From Valley Water Board Chair Tony Estremera regarding César Chávez Day

    The annual César Chávez Day has long represented more than the life of one person. It is a moment to recognize the broader fight for dignity, fair treatment, and the rights of farmworkers and working people whose labor sustains our communities.

    Read More
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Landscape Guides & Resources

Pool care tips

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How do I prevent evaporative water loss from my pool?

Evaporation from swimming pools contributes to water and energy waste. Evaporative water loss from uncovered pools can waste 12,000 to 31,000 gallons of water a year (EPA WaterSense). Using a pool cover can prevent up to 95 percent of pool water evaporation. Pool covers also keep debris from contaminating pool water and clogging filtration systems.  

 

How do I check for leaks in my pool?

Leaks in your pool’s structure or plumbing system can also be the source of significant water waste. Regularly check your pool for leaks to reduce the amount of water needed to refill on a regular basis. To determine if your pool has a leak,

  1. place a bucket on the top step of the pool,
  2. fill it with water to the water level of the pool.
  3. leave the bucket for 24 hours, and if after that time the water loss in the pool is greater than the water loss in the bucket, you likely have a leak.

Also, to prevent water loss, be sure not to overfill your pool and to regularly check the auto-fill valves to assure they are not stuck.

Learn about more water efficiency tips for your pool in the EPA WaterSense Pool Water Efficiency Guide.

 

Does Valley Water have restrictions on pools?

Restrictions on pools, including refiling, new construction, and pool covers are set by individual water retailers and/or cities and may vary throughout the county. As a water wholesaler, Valley Water does not have land use authority and cannot prohibit the construction of pools. The construction of a pool is permitted and approved by the local jurisdiction’s building and/or planning department(s). Additionally, the local water retailer has the authority to restrict the filling or refilling of swimming pools. Valley Water encourages replacing existing pools with low water use landscape by offering a rebate of $2/square foot through the Landscape Rebate Program.

To address the current drought conditions, Valley Water’s June 9, 2021 resolution (Resolution No. 21-68) declaring a water shortage emergency urges the County, cities, and water retailers to prohibit the use of potable water for the filling or refilling of swimming pools, among other water use prohibitions. Similarly, the regulatory agency overseeing private water retailers encourages comparable water use prohibitions; however, the decision to implement and enforce water use restrictions affecting pools lies with the local water retailer. 

 

How can I find out if there are pool restrictions in my City?

We recommend residents and businesses contact their individual water retailers for information about restrictions and/or guidelines on pool construction, filling, and maintenance. To find your retailer, visit www.valleywater.org/your-water/find-your-water-retailer.  While some municipalities have requirements already in place for new pools to install pool covers. If the drought worsens, most municipalities will move to restrict pool installation and fillings through their Water Shortage Contingency Plans.

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Santa Clara Valley Water District 2026
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Phone: 408-265-2600