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Water system · PWSID NJ1225001

MIDDLESEX WATER COMPANY

ISELIN, NJ · ~233,376 people served

Check your exact address → ISELIN overview
76
Good
PurityRadar safety score

PWSID

NJ1225001

State

New Jersey

City

ISELIN

Population served

233,376

Primary source

Surface water

Score history

▼ 24 points — the score moved from 100 to 76 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 76

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

PFOA

Perfluorooctanoic acid

4.5 ppt

limit 4 ppt

Above EPA limit · 1.1×

Lithium

14,000 ppt

limit —

No federal limit

PFBA

7.3 ppt

limit —

No federal limit

PFHxA

3.5 ppt

limit —

No federal limit

PFPeA

3.3 ppt

limit —

No federal limit

Violations & enforcement

60

Violations on record

0

Unaddressed

1

Health-based

42

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2023. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Apr 2023 Resolved
Other · EPA contaminant 7500 began Feb 2022 Resolved
Monitoring & reporting · Lead & Copper Rule began Jan 2022 Resolved
Other · EPA contaminant 7000 began Jul 2020 Resolved
Treatment technique · Lead & Copper Rule health-based began Jul 2019 Resolved
Monitoring & reporting · Lead & Copper Rule began Oct 2018 Resolved
Other · EPA contaminant 7000 began Jul 2018 Resolved
Monitoring & reporting · Lead & Copper Rule began Jul 2017 Resolved
Monitoring & reporting · Lead & Copper Rule began Jan 2017 Resolved
Monitoring & reporting · EPA contaminant 0999 began Oct 2015 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jun 2014 Resolved
Monitoring & reporting · Nitrate began Jan 2014 Resolved

Recent enforcement actions

  • State action · SOX Aug 2023
  • State action · SOX May 2023
  • State action · SFJ May 2023
  • State action · SOX Sep 2022
  • State action · SIE Aug 2022
  • State action · SFJ Aug 2022
  • State action · SOX Dec 2020
  • State action · SFJ Sep 2020

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

Arsenic

2 stations · latest Nov 2023

948 · max 1,710 ng/L · 11

Copper

2 stations · latest Nov 2023

3.09 · max 9.43 ug/L · 11

Lead

1 station · latest Nov 2023

525 · max 3,290 ng/L · 10

Fluoride

2 stations · latest Aug 2022

0.085 · max 0.09 mg/l · 2

Manganese

2 stations · latest Aug 2022

201 · max 402 ug/l · 2

Nitrate

1 station · latest Aug 2022

4.21 · max 4.21 mg/l as N · 2

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 NJ1225001 — 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.