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Water system · PWSID WI1130224

MADISON WATER UTILITY

MADISON, WI · ~272,000 people served

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

PWSID

WI1130224

State

Wisconsin

City

MADISON

Population served

272,000

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

Latest detections from EPA’s UCMR5 monitoring (through Oct 2024). Levels in parts per trillion (ppt).

PFHxS

Perfluorohexanesulfonic acid

4.8 ppt

limit 10 ppt

Below EPA limit

PFBA

47 ppt

limit —

No federal limit

Violations & enforcement

70

Violations on record

1

Unaddressed

4

Health-based

27

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Sep 2025. Official EPA record →

Other · EPA contaminant 7500 began Oct 2024 Unaddressed
Treatment technique · EPA contaminant 5200 health-based began Oct 2024 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jul 2013 Resolved
Other · EPA contaminant 7500 began Jan 2004 Resolved
Monitoring & reporting · EPA contaminant 2969 began Jan 2001 Resolved
Monitoring & reporting · EPA contaminant 2976 began Jan 2001 Resolved
Monitoring & reporting · EPA contaminant 2955 began Jan 2001 Resolved
Monitoring & reporting · EPA contaminant 2980 began Jan 2001 Resolved
Monitoring & reporting · EPA contaminant 2968 began Jan 2001 Resolved
Monitoring & reporting · EPA contaminant 2981 began Jan 2001 Resolved
Monitoring & reporting · EPA contaminant 2982 began Jan 2001 Resolved
Monitoring & reporting · EPA contaminant 2979 began Jan 2001 Resolved

Recent enforcement actions

  • EPA/federal action · EFL Sep 2025
  • State action · SOX Dec 2024
  • State action · SIF May 2014
  • State action · SOX Oct 2013
  • State action · SIA Oct 2013
  • State action · SIE Oct 2013
  • State action · SO6 Feb 2011
  • State action · SOX Jan 2004

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

Manganese

3 stations · latest Sep 2020

25 · max 70 ug/l · 10

Copper

3 stations · latest Sep 2020

9 · max 11 ug/l · 8

Lead

3 stations · latest Sep 2020

4 · max 8 ug/l · 8

Nitrate

3 stations · latest Jul 2023

0.978 · max 3.13 mg/l as N · 8

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 WI1130224 — 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.