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Water system · PWSID IL0930150

OSWEGO

OSWEGO, IL · ~38,169 people served

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

PWSID

IL0930150

State

Illinois

City

OSWEGO

Population served

38,169

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 Feb 2025). Levels in parts per trillion (ppt).

Lithium

93,100 ppt

limit —

No federal limit

Violations & enforcement

51

Violations on record

0

Unaddressed

24

Health-based

151

Enforcement actions

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

Monitoring & reporting · EPA contaminant 0999 began Sep 2024 Resolved
Other · EPA contaminant 7000 began Jul 2022 Resolved
Other · EPA contaminant 7000 began Jul 2017 Resolved
Other · EPA contaminant 7500 began May 2017 Resolved
Max contaminant level (MCL) · Uranium health-based began Jan 2017 Resolved
Monitoring & reporting · Uranium began Jul 2016 Resolved
Monitoring & reporting · Uranium began Apr 2014 Resolved
Monitoring & reporting · Uranium began Apr 2010 Resolved
Monitoring & reporting · Uranium began Jan 2007 Resolved
Monitoring & reporting · Uranium began Jul 2006 Resolved
Max contaminant level (MCL) · Uranium health-based began Apr 2006 Resolved
Max contaminant level (MCL) · Uranium health-based began Jan 2006 Resolved

Recent enforcement actions

  • State action · SIF Jun 2025
  • State action · SOX Nov 2024
  • State action · SIE Oct 2024
  • State action · SIA Oct 2024
  • State action · SOX Jun 2023
  • State action · SIA Jul 2022
  • State action · SOX Jun 2018
  • State action · SOX Aug 2017

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 May 2022

1.11 · max 1.16 ug/L · 2

Manganese

1 station · latest May 2022

34.8 · max 64.7 ug/L · 2

Fluoride

1 station · latest May 2022

0.14 · max 0.14 mg/L · 1

Lead

1 station · latest May 2022

1.61 · max 1.61 ug/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 IL0930150 — 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.