United States Environmental Protection Agency
Safe Drinking Water Information System
The federal record of public water system regulation in the United States: every public water system, the population it serves, its source type, and its history of violations of the National Primary Drinking Water Regulations, including maximum contaminant level exceedances and monitoring failures.
Rights
- Commercial reuse
- Yes
- Redistribution
- Yes
- Derivative use
- Yes
- Attribution required
- No
- Restrictions
- Applies to material authored by US federal agencies. Third-party material carried within a federal product may be separately protected.
- Terms last checked
- 23 August 2026
Access and coverage
- Publisher
- United States Environmental Protection Agency
- Geographic coverage
- United States — ~150,000 public water systems
- Temporal coverage
- 1993 onwards
- Update frequency
- quarterly
- Formats
- csv, json, api
- Bulk download
- Available
- Registration required
- No
- Cost to Hydrionis
- Free
- Domains
- quality, contaminant, enforcement, utility performance