A list of all contaminants Cal Water’s lab test for can be found on the Potential Contaminants page. Details related to specific contaminants are on these pages:
Water Quality Reports
Annual Consumer Confidence Reports detailing water quality, supply sources, and compliance with health standards for each district, to provide transparency and customer confidence in their water service.
Explore Reports
Water Treatment
Cal Water doesn’t take a “one-size-fits-all” approach to water treatment; instead, we work diligently to identify the best, most cost-effective treatment required for each water source.
Learn About Water Treatment
Water Quality Testing Labs
If you have a concern about your home water, you can contact an accredited lab for information on home water testing.
Learn More About our Labs