KNOLLS WATER COOPERATIVE

HINSDALE, IL · ~400 people served

Check your exact address → HINSDALE overview

100

Excellent

PurityRadar safety score

PWSID

WI2300145

State

Illinois

City

HINSDALE

Population served

400

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 Aug 2014. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Jan 2013 Resolved

Monitoring & reporting · Lead & Copper Rule began Jan 2012 Resolved

Monitoring & reporting · Total coliform began Jul 2006 Resolved

Monitoring & reporting · Total coliform began Jun 2004 Resolved

Monitoring & reporting · Total coliform began Oct 2003 Resolved

Monitoring & reporting · Total coliform began May 2000 Resolved

Monitoring & reporting · Total coliform began Sep 1998 Resolved

Monitoring & reporting · EPA contaminant 2032 began Jan 1994 Resolved

Monitoring & reporting · EPA contaminant 2033 began Jan 1994 Resolved

Monitoring & reporting · EPA contaminant 2034 began Jan 1994 Resolved

Recent enforcement actions

State action · SOX Aug 2014
State action · SO8 Aug 2014
State action · SOX Jul 2013
State action · SO8 Jan 2013
State action · SO8 Feb 2012
State action · SIF Sep 2006
State action · SFG Aug 2006
State action · SIE Aug 2006

This profile is built from EPA public records for system WI2300145 — 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.