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Water system · PWSID MA3288000

SUDBURY WATER DISTRICT

SUDBURY, MA · ~18,416 people served

Check your exact address → SUDBURY overview

Good

PurityRadar safety score

PWSID

MA3288000

State

Massachusetts

City

SUDBURY

Population served

18,416

Primary source

Groundwater

Score history

▼ 27 points — the score moved from 100 to 73 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 73

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 Jun 2025). Levels in parts per trillion (ppt).

PFOA

Perfluorooctanoic acid

8 ppt

limit 4 ppt

Above EPA limit · 2.0×

PFBA

5 ppt

limit —

No federal limit

PFHxA

5 ppt

limit —

No federal limit

PFPeA

5 ppt

limit —

No federal limit

PFBS

4 ppt

limit —

No federal limit

PFHpA

3 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jan 2026. Official EPA record →

Monitoring & reporting · EPA contaminant 3002 began Jun 2019 Unaddressed

Treatment technique · Lead & Copper Rule health-based began Aug 2025 Addressed

Monitoring & reporting · Lead & Copper Rule began Jun 2022 Addressed

Monitoring & reporting · Lead & Copper Rule began Jun 2018 Addressed

Monitoring & reporting · Gross alpha began Mar 2014 Resolved

Monitoring & reporting · EPA contaminant 2992 began Jun 2010 Resolved

Monitoring & reporting · EPA contaminant 2983 began Jun 2010 Resolved

Monitoring & reporting · EPA contaminant 2996 began Jun 2010 Resolved

Monitoring & reporting · EPA contaminant 2989 began Jun 2010 Resolved

Monitoring & reporting · EPA contaminant 2976 began Jun 2010 Resolved

Monitoring & reporting · EPA contaminant 2380 began Jun 2010 Resolved

Monitoring & reporting · EPA contaminant 2968 began Jun 2010 Resolved

Recent enforcement actions

State action · SFL Jan 2026
State action · SFL Feb 2023
State action · SFL Jul 2019
State action · SFL Feb 2019
State action · SOX May 2014
State action · SFJ May 2014
State action · SIE Oct 2011
State action · SOX Jun 2011

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.

ContaminantMedian · max · samples

Nitrate

7 stations · latest Sep 2024

0.525 · max 4.99 mg/L · 78

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 MA3288000 — 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.