Safe Drinking Water Information System
EPA’s Safe Drinking Water Information System (SDWIS) databases store information about drinking water. The federal version (SDWIS/FED) stores the information 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.
- Basic Information
- Drinking Water Data Managers’ Information - The following links are intended for users of EPA’s drinking water data management systems.
- Data Reliability - EPA routinely evaluates state drinking water programs by conducting data verification audits, which evaluate state compliance decisions and reporting to SDWIS/FED.