Home/ Directory/ NH/ GREAT BAY WATER SYSTEM

Water system · PWSID NH1732030

GREAT BAY WATER SYSTEM

NASHUA, NH · ~218 people served

Check your exact address → NASHUA overview
100
Excellent
PurityRadar safety score

PWSID

NH1732030

State

New Hampshire

City

NASHUA

Population served

218

Primary source

Groundwater

Score history

No change since tracking began Jun 18, 2026.

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

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

123

Violations on record

0

Unaddressed

6

Health-based

30

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2010. Official EPA record →

Max contaminant level (MCL) · Total coliform health-based began Dec 2009 Resolved
Max contaminant level (MCL) · Total coliform health-based began Oct 2009 Resolved
Max contaminant level (MCL) · Total coliform health-based began Aug 2008 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jul 2005 Resolved
Max contaminant level (MCL) · Gross alpha health-based began Jan 2004 Resolved
Max contaminant level (MCL) · Uranium health-based began Jan 2004 Resolved
Monitoring & reporting · EPA contaminant 2010 began Jan 1998 Resolved
Monitoring & reporting · EPA contaminant 2005 began Jan 1998 Resolved
Monitoring & reporting · Nitrate began Jan 1998 Resolved
Monitoring & reporting · Nitrite began Jan 1998 Resolved
Monitoring & reporting · EPA contaminant 2378 began Jan 1998 Resolved
Monitoring & reporting · EPA contaminant 2380 began Jan 1998 Resolved

Recent enforcement actions

  • State action · SOX Aug 2010
  • State action · SIF Dec 2009
  • State action · SFJ Dec 2009
  • State action · SIE Dec 2009
  • State action · SIA Dec 2009
  • State action · SIF Oct 2009
  • State action · SIA Oct 2009
  • State action · SIE Oct 2009

This profile is built from EPA public records for system NH1732030 — 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.