States ›Massachusetts ›Middlesex County ›Lexington

Lexington, MA Tap Water Quality 2026

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

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

Main Utility: Lexington Water Dept. (mwra) PWSID: MA3155000 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 1.79 ppb, 12% of the action level and no violations are open. No PFAS was detected.

A

Lexington earns an A for water quality

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

Lead: 1.79 ppb — 12% of the federal action level
PFAS tested, none detected
2 violations since 2015, 0 health-based
No violations currently open
Lexington's lead level vs. all Massachusetts community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 1.79 ppb — 12% of the federal action level
✓ Lower lead than 72% of Massachusetts utilities
Population Served
32349
~13445 connections
Water Source
Surface water
Purchased from another system — SDWIS source code SWP
Active Violations
0
2 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
12% of EPA action level
1.79 ppb
Action level: 15 ppb
The 90th-percentile lead result is 1.79 ppb, 12% 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
Lead and Copper Rule MONITORING AND REPORTING — TT 2025 Addressed
Lead and Copper Rule MONITORING AND REPORTING — TT 2024 Addressed
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

2 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 Lexington Water Dept. (Mwra)
PWSID MA3155000
Water source Surface water — Purchased from another system — SDWIS source code SWP
Population served 32,349
Service connections 13,445
Systems serving this area 7
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Lexington tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 1.79 ppb, 12% of the action level.
Does Lexington water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Lexington? ▼
Lexington Water Dept. (Mwra) (PWSID MA3155000), one of 7 systems serving this area. Surface water. Purchased from another system — SDWIS source code SWP
When was this system last inspected? ▼
It was last inspected on 2023-09-08. No significant deficiencies were recorded.

What Should Lexington 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.

Nearby Cities in Massachusetts

Cambridge, Ma Tap Water Quality 2026 Middlesex Lowell, Ma Tap Water Quality 2026 Middlesex Somerville, Ma Tap Water Quality 2026 Middlesex Newton, Ma Tap Water Quality 2026 Middlesex Framingham, Ma Tap Water Quality 2026 Middlesex Malden, Ma Tap Water Quality 2026 Middlesex