WONDER LAKE (NIU)

WONDER LAKE, IL · ~1,950 people served

Check your exact address → WONDER LAKE overview

100

Excellent

PurityRadar safety score

PWSID

IL1115850

State

Illinois

City

WONDER LAKE

Population served

1,950

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 · Lead & Copper Rule began Nov 2024 Resolved

Monitoring & reporting · EPA contaminant 0999 began Nov 2024 Resolved

Max contaminant level (MCL) · Arsenic health-based began Jul 2013 Resolved

Max contaminant level (MCL) · Arsenic health-based began Apr 2013 Resolved

Monitoring & reporting · Lead & Copper Rule began Oct 2004 Resolved

Recent enforcement actions

State action · SIF Oct 2025
State action · SIF Oct 2025
State action · SIE Dec 2024
State action · SIE Dec 2024
State action · SIA Dec 2024
State action · SIA Dec 2024
State action · SOX Dec 2024
State action · SOX Dec 2024

This profile is built from EPA public records for system IL1115850 — 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.