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Dog drinking water at fountain for dogs

Water Quality

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.