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Marseilles, IL Tap Water Quality 2026

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

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

Main Utility: Marseilles PWSID: IL0990500 Updated: 2026 Q2
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Lead above the federal action level

Lead is 19.10 ppb, 127% of the action level. No PFAS was detected.

F

Marseilles earns an F for water quality

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

Lead: 19.10 ppb — 127% of the federal action level
PFAS tested, none detected
8 violations since 2015, 1 health-based
1 violation currently open
Marseilles's lead level vs. all Illinois community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 19.10 ppb — 100% of the federal action level
✓ Lower lead than 1% of Illinois utilities
Population Served
4627
~2209 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
1
1 open of 8 since 2015

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
100% of EPA action level
19.10 ppb
Action level: 15 ppb
The 90th-percentile lead result is 19.10 ppb, 127% 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)

ContaminantTypeMeasuredLimitPeriodStatus
Public Notice OTHER — — 2025 Unaddressed
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2025 Unaddressed
LEAD AND COPPER RULE REVISIONS TREATMENT TECHNIQUE — — 2024 Unaddressed
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2024 Resolved
Consumer Confidence Rule OTHER — — 2024 Resolved
Consumer Confidence Rule OTHER — — 2023 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2021–2022 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2021–2022 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

1 violation remains open, out of 8 recorded since 2015 (1 health-based).

About the Main Water System

Utility Marseilles
PWSID IL0990500
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 4,627
Service connections 2,209
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Marseilles tap water safe to drink? ▼
No federal limit is exceeded on record. 1 violation(s) remain open. Lead is 19.10 ppb, 127% of the action level.
Does Marseilles water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Marseilles? ▼
Marseilles (PWSID IL0990500), one of 2 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-01-07. No significant deficiencies were recorded.

What Should Marseilles Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
2
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.
3
Follow the open violation
This system has an unresolved violation. Contact the supplier for its corrective-action schedule.

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