MWRA
PWS ID: MA6000000 · CHELSEA, Massachusetts 02150
Population Served
2,660,000
Total Violations
6
Health-Based Violations
1
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- State
- Connections
- 217
- County
- Suffolk
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 2
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Simazine | MR | 1 | 2001 |
| Atrazine | MR | 1 | 2001 |
| Surface Water Treatment Rule | TT | 1 | 1992 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.