DERRY WATER DEPT

DERRY, NH · ~17,290 people served

Check your exact address → DERRY overview

Excellent

PurityRadar safety score

PWSID

NH0611010

State

New Hampshire

City

DERRY

Population served

17,290

Primary source

SWP

Score history

▼ 9 points — the score moved from 100 to 91 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 91

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 Oct 2024). Levels in parts per trillion (ppt).

PFOA

Perfluorooctanoic acid

4.2 ppt

limit 4 ppt

Above EPA limit · 1.0×

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Feb 2005. Official EPA record →

Max contaminant level (MCL) · Total coliform health-based began Aug 2004 Resolved

Max contaminant level (MCL) · Total coliform health-based began Sep 1998 Resolved

Max contaminant level (MCL) · Total coliform health-based began Jun 1998 Resolved

Recent enforcement actions

State action · SOX Feb 2005
State action · SIF Aug 2004
State action · SIA Aug 2004
State action · SIE Aug 2004
State action · SOX Mar 1999
State action · SIA Sep 1998
State action · SIE Sep 1998
State action · SIF Sep 1998

This profile is built from EPA public records for system NH0611010 — 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.