CAMBRIDGE WATER DEPARTMENT

CAMBRIDGE, MA · ~118,214 people served

Check your exact address → CAMBRIDGE overview

Excellent

PurityRadar safety score

PWSID

MA3049000

State

Massachusetts

City

CAMBRIDGE

Population served

118,214

Primary source

Surface water

Score history

▼ 13 points — the score moved from 100 to 87 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 87

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 Dec 2023). Levels in parts per trillion (ppt).

PFOA

Perfluorooctanoic acid

4.8 ppt

limit 4 ppt

Above EPA limit · 1.2×

PFPeA

3.6 ppt

limit —

No federal limit

PFHxA

3.1 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jul 2018. Official EPA record →

Other · EPA contaminant 7000 began Jul 2017 Resolved

Recent enforcement actions

State action · SOX Jul 2018
State action · SFL Jul 2018
State action · SFJ Aug 2009
State action · SFL Nov 2008
State action · SFO Mar 2007

This profile is built from EPA public records for system MA3049000 — 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.