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Water system · PWSID NH1951010

PORTSMOUTH WATER WORKS

PORTSMOUTH, NH · ~33,000 people served

Check your exact address → PORTSMOUTH overview
59
Fair
PurityRadar safety score

PWSID

NH1951010

State

New Hampshire

City

PORTSMOUTH

Population served

33,000

Primary source

Surface water

Score history

▼ 41 points — the score moved from 100 to 59 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 59

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

PFOS

Perfluorooctanesulfonic acid

5 ppt

limit 4 ppt

Above EPA limit · 1.3×

PFOA

Perfluorooctanoic acid

4 ppt

limit 4 ppt

Near EPA limit

PFHxS

Perfluorohexanesulfonic acid

4 ppt

limit 10 ppt

Below EPA limit

Lithium

9,650 ppt

limit —

No federal limit

PFBS

6 ppt

limit —

No federal limit

PFBA

5 ppt

limit —

No federal limit

PFPeA

4 ppt

limit —

No federal limit

PFHpA

3 ppt

limit —

No federal limit

PFHxA

3 ppt

limit —

No federal limit

Violations & enforcement

12

Violations on record

0

Unaddressed

12

Health-based

38

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Feb 2015. Official EPA record →

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2014 Resolved
Treatment technique · EPA contaminant 0300 health-based began Jan 2008 Resolved
Treatment technique · EPA contaminant 0200 health-based began Mar 2007 Resolved
Treatment technique · EPA contaminant 0300 health-based began Jul 2006 Resolved
Treatment technique · EPA contaminant 0300 health-based began Oct 2005 Resolved
Treatment technique · EPA contaminant 0300 health-based began Oct 2005 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Apr 2003 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jan 2003 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jan 2003 Resolved
Max contaminant level (MCL) · Total coliform health-based began Oct 2001 Resolved
Treatment technique · EPA contaminant 0200 health-based began Jul 2001 Resolved
Treatment technique · EPA contaminant 0200 health-based began Dec 1998 Resolved

Recent enforcement actions

  • State action · SIF Feb 2015
  • State action · SOX Feb 2015
  • State action · SIE Nov 2014
  • State action · SIA Nov 2014
  • State action · SOX Oct 2008
  • State action · SIF Apr 2008
  • State action · SIE Feb 2008
  • State action · SIA Feb 2008

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

1 station · latest Jul 2022

0.12 · max 0.2 mg/L · 8

Lead

1 station · latest Jul 2022

0.0007 · max 0.001 mg/L · 3

Copper

1 station · latest Jul 2020

0.0011 · max 0.0011 mg/L · 1

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 NH1951010 — 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.