Press Release

California Water Service Issues Precautionary Do-Not-Drink Advisory After Tank Compromised

Torrance, Calif.—California Water Service (Cal Water) is advising customers in a portion of its Palos Verdes water system to not drink the water temporarily. The company issued the precautionary advisory after a small storage tank serving a portion of the system was found to be compromised late Monday afternoon.

Cal Water is working with the State Water Resources Control Board's Division of Drinking Water (DDW) and local law enforcement to fully investigate the breach. Initial water quality test results are normal, but Cal Water will be conducting extensive water quality tests over the next few weeks to determine whether the quality of the water in the tank was impacted. In the meantime, Cal Water is flushing water from hydrants in the area and making operational adjustments to bring fresh water to this portion of the system.

"Although we are not being required to do so, out of an abundance of caution, we are advising our customers to not use the water for drinking and cooking until we have completed our flushing and operational adjustments to get fresh water to the area," said Dan Armendariz, District Manager. "The details are still evolving, but we will keep our customers updated as quickly as possible as we move forward."

The precautionary advisory applies to customers residing in a small portion of Palos Verdes Estates. A detailed map is available at

Cal Water is collecting and testing water samples under the direction of DDW, and will provide results to customers as it receives them over the next few weeks.

"Until further notice, we ask customers in this area to please use bottled water for drinking and cooking. Customers may save receipts during this time for reimbursement by Cal Water," said Armendariz. "We apologize for this inconvenience. Protecting our customers' health and safety is our highest priority."

Notices are also being sent door-to-door to those customers' properties, and they are being notified by phone and email if on file. For more information, customers call Cal Water's Customer Center at (310) 257-1400 or visit

Cal Water serves about 309,200 people through 84,700 service connections in Carson, Torrance, Hermosa Beach, Redondo Beach, and the Palos Verdes Peninsula. The company, which has provided water service in the area since 1927, was ranked "Highest in Customer Satisfaction among Water Utilities in the West" in 2016 by J.D. Power in its inaugural Water Utility Residential Customer Satisfaction Study. Additional information may be obtained online at