PWSID
MA3119000
State
Massachusetts
City
HAMILTON
Population served
7,377
Primary source
Groundwater
Score history
▼ 66 points — the score moved from 100 to 34 on Jun 18, 2026, as newly published EPA data was incorporated.
2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.
PFAS & contaminant readings
Latest detections from EPA’s UCMR5 monitoring (through Oct 2023). Levels in parts per trillion (ppt).
PFOS
Perfluorooctanesulfonic acid
11 ppt
limit 4 ppt
PFOA
Perfluorooctanoic acid
11 ppt
limit 4 ppt
PFBS
4.7 ppt
limit —
PFHxA
3.2 ppt
limit —
PFPeA
3 ppt
limit —
Violations & enforcement
3
Violations on record
0
Unaddressed
3
Health-based
20
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Jan 2022. Official EPA record →
Recent enforcement actions
- State action · SFJ Jan 2022
- State action · SFL Sep 2016
- State action · SIE Jan 2016
- State action · SOX Jan 2012
- State action · SFL Nov 2011
- State action · SFL Aug 2010
- State action · SFL Sep 2009
- State action · SOX Sep 2009
Area water-quality monitoring
Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.
Nitrate
1 station · latest Aug 2022
Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.
This profile is built from EPA public records for system MA3119000 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.