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Winchester, MA Tap Water Quality 2026

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

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

Main Utility: Winchester Water Dept PWSID: MA3344000 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 4.20 ppb, 28% of the action level and no violations are open. No PFAS was detected.

A

Winchester earns an A for water quality

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

Lead: 4.20 ppb — 28% of the federal action level
PFAS tested, none detected
12 violations since 2015, 0 health-based
No violations currently open
Winchester's lead level vs. all Massachusetts community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 4.20 ppb — 28% of the federal action level
✓ Lower lead than 24% of Massachusetts utilities
Population Served
22957
~7142 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
12 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
28% of EPA action level
4.20 ppb
Action level: 15 ppb
The 90th-percentile lead result is 4.20 ppb, 28% 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
Fluoride MONITORING AND REPORTING — 4.0 mg/L 2026 Archived
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2026 Archived
Mercury MONITORING AND REPORTING — 0.002 mg/L 2026 Archived
Selenium MONITORING AND REPORTING — 0.05 mg/L 2026 Archived
Barium MONITORING AND REPORTING — 2 mg/L 2026 Archived
Cadmium MONITORING AND REPORTING — 0.005 mg/L 2026 Archived
Chromium MONITORING AND REPORTING — 0.1 mg/L 2026 Archived
Antimony, Total MONITORING AND REPORTING — 0.006 mg/L 2026 Archived
Beryllium, Total MONITORING AND REPORTING — 0.004 mg/L 2026 Archived
Nickel MONITORING AND REPORTING — — 2026 Archived
Thallium, Total MONITORING AND REPORTING — 0.002 mg/L 2026 Archived
CYANIDE MONITORING AND REPORTING — 0.2 mg/L 2026 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

12 violations are on record since 2015, of which 0 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Winchester Water Dept
PWSID MA3344000
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 22,957
Service connections 7,142
Systems serving this area 5
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Winchester tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 4.20 ppb, 28% of the action level.
Does Winchester water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Winchester? ▼
Winchester Water Dept (PWSID MA3344000), one of 5 systems serving this area. Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2025-11-06. No significant deficiencies were recorded.

What Should Winchester Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
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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