# Cohasset Water Dept: health-based drinking water violation (tthm) in Cohasset, MA

**Score:** 75/100

| Field | Value |
|---|---|
| Water system | Cohasset Water Dept |
| PWSID | MA4065000 |
| System type | Community water system |
| Owner type | Local government |
| Population served | 7555 |
| Location | Cohasset, MA |
| Contaminant | TTHM |
| Rule group | Disinfectants and disinfection byproducts |
| Compliance period | 2026-07-01 to 2026-09-30 |
| Status | Known, unaddressed |
| Public notice tier | 2 |

## Why this score
- Not yet returned to compliance.
- Serves 7,555 people.
- Community water system.

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) via Envirofacts and EPA ECHO (https://echo.epa.gov/detailed-facility-report?fid=110048116169). Last refreshed: 2026-11-04T06:06:47.254Z.
From EPA SDWIS federal data, which lags state records by up to a quarter. A violation is a regulatory finding about a water system, not a statement about current water quality. Verify with the state drinking water program.