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Hamilton, MA Tap Water Quality 2026

Water quality report for Hamilton, MA — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Hamilton's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Hamilton Water Dept PWSID: MA3119000 Updated: 2026 Q2
⚠️

PFAS above the federal limit at 1 of 2 sampling points

Lead is 2.70 ppb, 18% of the action level and no violations are open. However, PFAS exceeds the federal limit at 1 of 2 sampling points, running as high as 2.51 times the limit.

C

Hamilton earns a C for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 2.70 ppb — 18% of the federal action level
PFAS above the federal limit at 1 of 2 sampling points
1 violations since 2015, 1 health-based
No violations currently open
Hamilton's lead level vs. all Massachusetts community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 2.70 ppb — 18% of the federal action level
✓ Lower lead than 48% of Massachusetts utilities
Population Served
7502
~2567 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
1 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
18% of EPA action level
2.70 ppb
Action level: 15 ppb
The 90th-percentile lead result is 2.70 ppb, 18% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE — 0.060 mg/L 2019 Archived
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

1 violations are on record since 2015, of which 1 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Hamilton Water Dept
PWSID MA3119000
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 7,502
Service connections 2,567
Systems serving this area 5
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Hamilton tap water safe to drink? ▼
It meets most federal standards, but PFAS exceeds the federal limit at 1 of 2 sampling points. No violations are currently open. Lead is 2.70 ppb, 18% of the action level.
Does Hamilton water have PFAS? ▼
Yes. PFAS exceeds the federal limit at 1 of 2 sampling points, running as high as 2.51 times the limit. Limits are enforced on a running annual average at each sampling point, not on a single sample.
Who supplies water to Hamilton? ▼
Hamilton Water Dept (PWSID MA3119000), one of 5 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2026-05-29. No significant deficiencies were recorded.

What Should Hamilton Residents Do?

1
Consider a reverse-osmosis filter
Reverse osmosis removes more than 95% of PFAS. Standard carbon pitchers do not.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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