We are dedicated to protecting and maintaining your water quality.
Our water system is fortunate to have some of the best water in the U.S. Our major water source is the well-protected Tuolumne Watershed, where spring snowmelt flows from the Tuolumne River into Hetch Hetchy Reservoir. We rigorously protect and test the quality of your water to ensure that it meets or exceeds all federal and state standards for health.
Read Our Annual Water Quality Reports
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|Filipino (2022)||繁體中文 (2022)|
|Annual Water Quality Report - San Francisco Regional System (2022)|
|Annual Water Quality Report - Treasure Island (2022)|
|Annual Water Quality Report - Town of Sunol (2022)|
Read our Triennial Public Health Goals Report
The California Health and Safety Code §116470(b) (Attachment A) requires public water utilities serving more than 10,000 service connections to prepare a written report every three years providing information about contaminants detected at levels exceeding Public Health Goals (PHGs).