Lemont, IL Tap Water Quality 2026

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

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

Main Utility: Lemont PWSID: IL0311620 Updated: 2026 Q2

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Lead above the federal action level

Lead is 20.00 ppb, 133% of the action level and no violations are open. No PFAS was detected.

Lemont earns a D for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 20.00 ppb — 133% of the federal action level

PFAS tested, none detected

8 violations since 2015, 6 health-based

No violations currently open

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

0 ppb5 ppb10 ppb15 ppb

Lead level: 20.00 ppb — 100% of the federal action level

✓ Lower lead than 1% of Illinois utilities

Population Served

16739

~6396 connections

Water Source

Groundwater

Drawn from wells — SDWIS source code GW

Active Violations

8 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)

90th percentile of tap samples collected across the distribution system

100% of EPA action level

20.00 ppb

Action level: 15 ppb

The 90th-percentile lead result is 20.00 ppb, 133% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

Contaminant	Type	Measured	Limit	Period	Status
Lead and Copper Rule	TREATMENT TECHNIQUE	—	TT	2025	Resolved
Lead and Copper Rule	MONITORING AND REPORTING	—	TT	2023	Resolved
Lead and Copper Rule	MONITORING AND REPORTING	—	TT	2020	Resolved
Combined Radium (-226 and -228)	MCL EXCEEDANCE	7 PCI/L	5 pCi/L	2015	Resolved
Combined Radium (-226 and -228)	MCL EXCEEDANCE	7 PCI/L	5 pCi/L	2015	Resolved
Combined Radium (-226 and -228)	MCL EXCEEDANCE	7 PCI/L	5 pCi/L	2015	Resolved
Combined Radium (-226 and -228)	MCL EXCEEDANCE	26 PCI/L	5 pCi/L	2015	Resolved
Combined Radium (-226 and -228)	MCL EXCEEDANCE	7 PCI/L	5 pCi/L	2015	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

8 violations are on record since 2015, of which 6 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Lemont

PWSID IL0311620

Water source Groundwater — Drawn from wells — SDWIS source code GW

Population served 16,739

Service connections 6,396

Systems serving this area 4

Regulator State primacy agency

Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Lemont tap water safe to drink? ▼

No federal limit is exceeded on record. No violations are currently open. Lead is 20.00 ppb, 133% of the action level.

Does Lemont water have PFAS? ▼

It was tested for the six regulated PFAS compounds and none were detected.

Who supplies water to Lemont? ▼

Lemont (PWSID IL0311620), one of 4 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW

When was this system last inspected? ▼

It was last inspected on 2023-06-27. Inspectors recorded 2 significant deficiencies.

What Should Lemont Residents Do?

Consider a filter certified for lead

Look for NSF/ANSI 53 certification for lead reduction.

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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