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The Safe Drinking Water Information System (SDWIS) databases store information about drinking water. The federal version (SDWIS/FED) stores the information the Environmental Protection Agency (EPA) needs to monitor approximately 156,000 public water systems. The state version (SDWIS/STATE) is a database designed to help states run their drinking water programs. These databases contain information submitted by states, EPA regions, and public water systems in conformance with reporting requirements established by the Safe Drinking Water Act (SDWA) and related regulations. EPA uses these data to address non-compliant systems, oversee state drinking water systems, track contaminant levels, respond to public inquiries, and prepare national reports (such as the Annual Potable Water Systems Compliance Report 2).


  • Environmental Protection Agency, Office of Water (EPA/OW)



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Included for each water system: Basic information: name, location, type of system, number of people served. Violation information: compliance with monitoring and treatment schedules, etc. Enforcement information: actions taken to return system to compliance. Sampling information: for unregulated and regulated contaminants.

References and related web pages. Accessed September 5, 2010. Accessed September 5, 2010.