Drinking water in Washington, District of Columbia is delivered through 12 EPA-regulated community water systems serving an estimated 670,567 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.

The SDWIS record for Washington shows 51 total violations across all 12 systems, of which 51 are health-based, meaning either a Maximum Contaminant Level (MCL) was exceeded or a required treatment technique was not followed. Contaminants cited in health-based violations include 0200, 2950, 5200, 8000, 0700 and 3 others. 12 TRI-reporting industrial facilityies are also located within the city limits.

A past EPA violation does not mean the water is currently unsafe, utilities are required to notify customers and remediate under state primacy oversight. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the District of Columbia drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.