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About This Data
This site uses data from the EPA's Safe Drinking Water Information System (SDWIS), which tracks violations reported by all 50 states, territories, and tribes. The data covers public water systems serving everything from small communities to major cities.
What is a health-based violation?
A health-based violation means a water system exceeded an EPA maximum contaminant level (MCL) or failed to treat water to required standards. These violations indicate potential health risks from contaminants like lead, arsenic, bacteria, nitrates, or disinfection byproducts.
What should I do if my water system has violations?
If your water system has active health-based violations, consider using a certified water filter appropriate for the specific contaminants found. Contact your water utility for their latest Consumer Confidence Report, and check whether violations have been resolved.