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Water system · PWSID IL1635090

S L M WATER COMMISSION

MASCOUTAH, IL · ~385 people served

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

PWSID

IL1635090

State

Illinois

City

MASCOUTAH

Population served

385

Primary source

Surface water

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

4

Violations on record

0

Unaddressed

2

Health-based

31

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Oct 2014. Official EPA record →

Treatment technique · EPA contaminant 0800 health-based began Jun 2014 Resolved
Monitoring & reporting · Total coliform began Aug 2006 Resolved
Monitoring & reporting · EPA contaminant 1006 began Jul 2006 Resolved
Max contaminant level (MCL) · EPA contaminant 2050 health-based began Apr 1995 Resolved

Recent enforcement actions

  • State action · SFK Oct 2014
  • State action · SFJ Aug 2014
  • State action · SIF Aug 2014
  • State action · SOX Aug 2014
  • State action · SIA Jul 2014
  • State action · SIE Jul 2014
  • State action · SOX Oct 2006
  • State action · SIA Sep 2006

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

1 station · latest Oct 2021

4.09 · max 5.69 ug/L · 5

Fluoride

1 station · latest Oct 2021

0.19 · max 0.22 mg/L · 5

Manganese

1 station · latest Oct 2021

205 · max 310 ug/L · 5

Atrazine

1 station · latest Oct 2021

0.93 · max 6 ug/L · 4

Lead

1 station · latest Oct 2021

1.1 · max 1.24 ug/L · 4

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 IL1635090 — 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.