LITTLE SWAN LAKE SD

MONMOUTH, IL · ~438 people served

Check your exact address → MONMOUTH overview

100

Excellent

PurityRadar safety score

PWSID

IL1875050

State

Illinois

City

MONMOUTH

Population served

438

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

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

Violations on record

Unaddressed

Health-based

Enforcement actions

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

Monitoring & reporting · Lead & Copper Rule began Jul 2025 Unaddressed

Monitoring & reporting · Lead & Copper Rule began Dec 2022 Resolved

Other · EPA contaminant 7000 began Jul 2011 Resolved

Monitoring & reporting · EPA contaminant 0999 began Oct 2007 Resolved

Monitoring & reporting · EPA contaminant 0999 began Apr 2007 Resolved

Max contaminant level (MCL) · Fluoride health-based began Jun 1984 Resolved

Recent enforcement actions

State action · SIE Oct 2025
State action · SIA Oct 2025
State action · SOX Jan 2023
State action · SIA Jan 2023
State action · SOX Aug 2011
State action · SIA Jul 2011
State action · SOX Dec 2007
State action · SIA Nov 2007

This profile is built from EPA public records for system IL1875050 — 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.