Illiopolis, IL Tap Water Quality 2026

Water quality report for Illiopolis, IL — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Illiopolis's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Illiopolis PWSID: IL1670550 Updated: 2026 Q2

✅

No federal limits exceeded on record

Lead was not detected and no violations are open. PFAS has never been sampled at this system.

Illiopolis earns a B for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: not detected

PFAS never sampled at this system

11 violations since 2015, 4 health-based

No violations currently open

Illiopolis's lead level vs. all Illinois community water systems

0 ppb5 ppb10 ppb15 ppb

Lead level: Not detected — 0% of the federal action level

✓ Lower lead than % of Illinois utilities

Population Served

846

~445 connections

Water Source

Groundwater

Purchased groundwater from another system — SDWIS source code GWP

Active Violations

11 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)

90th percentile of tap samples collected across the distribution system

0% of EPA action level

Not detected

Action level: 15 ppb

Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings.

Contaminant Violations (2015–Present)

Contaminant	Type	Measured	Limit	Period	Status
TTHM	MONITORING AND REPORTING	—	0.080 mg/L	2025	Resolved
Total Haloacetic Acids (HAA5)	MONITORING AND REPORTING	—	0.060 mg/L	2025	Resolved
TTHM	MONITORING AND REPORTING	—	0.080 mg/L	2024	Resolved
Lead and Copper Rule	MONITORING AND REPORTING	—	TT	2023	Resolved
Consumer Confidence Rule	OTHER	—	—	2023	Resolved
TTHM	MCL EXCEEDANCE	0.092 MG/L	0.080 mg/L	2022	Resolved
TTHM	MCL EXCEEDANCE	0.091 MG/L	0.080 mg/L	2022	Resolved
TTHM	MCL EXCEEDANCE	0.093 MG/L	0.080 mg/L	2021	Resolved
TTHM	MCL EXCEEDANCE	0.084 MG/L	0.080 mg/L	2021	Resolved
Chlorine	MONITORING AND REPORTING	—	4.0 mg/L	2020	Resolved
Lead and Copper Rule	MONITORING AND REPORTING	—	TT	2017	Resolved

Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

11 violations are on record since 2015, of which 4 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Illiopolis

PWSID IL1670550

Water source Groundwater — Purchased groundwater from another system — SDWIS source code GWP

Population served 846

Service connections 445

Systems serving this area 1

Regulator State primacy agency

Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Illiopolis tap water safe to drink? ▼

No federal limit is exceeded on record. No violations are currently open.

Does Illiopolis water have PFAS? ▼

This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.

Who supplies water to Illiopolis? ▼

Illiopolis (PWSID IL1670550). Groundwater. Purchased groundwater from another system — SDWIS source code GWP

When was this system last inspected? ▼

It was last inspected on 2025-11-21. No significant deficiencies were recorded.

What Should Illiopolis Residents Do?

Read your annual water report

Your supplier publishes a Consumer Confidence Report each July covering the prior year.

Check for a lead service line

Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.

Flush before drinking

If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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