Washington Tap Water Quality: Is It Safe to Drink?
2026 EPA water quality data for 0 community water systems serving residents in Washington. Find your water system to see violations, PFAS results, lead testing, and a safety grade — free.
Washington draws drinking water from Cascade Range snowmelt, Puget Sound area rivers, and the Columbia Basin aquifer. Seattle's Cedar River watershed delivers exceptionally clean surface water. Naturally occurring arsenic is found in some eastern Washington groundwater, and PFAS contamination has been detected near military sites.
Find Your Water System in Washington
Enter your ZIP code to see EPA violations, lead test results, PFAS data, and a safety grade for your water.
📊 Data from EPA’s SDWIS
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🔄 Updated quarterly
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🏛️ 0+ water systems in Washington