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Mendota, IL Tap Water Quality 2026

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

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

Main Utility: Mendota PWSID: IL0990550 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 8.07 ppb, 54% of the action level and no violations are open. No PFAS was detected.

C

Mendota earns a C for water quality

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

Lead: 8.07 ppb — 54% of the federal action level
PFAS tested, none detected
6 violations since 2015, 3 health-based
No violations currently open
Mendota's lead level vs. all Illinois community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 8.07 ppb — 54% of the federal action level
✓ Lower lead than 15% of Illinois utilities
Population Served
7040
~2818 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
6 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
54% of EPA action level
8.07 ppb
Action level: 15 ppb
The 90th-percentile lead result is 8.07 ppb, 54% 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
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2025 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2025 Resolved
Consumer Confidence Rule OTHER — — 2025 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.084 MG/L 0.060 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.089 MG/L 0.060 mg/L 2020 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.082 MG/L 0.060 mg/L 2020 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

6 violations are on record since 2015, of which 3 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Mendota
PWSID IL0990550
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 7,040
Service connections 2,818
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Mendota tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 8.07 ppb, 54% of the action level.
Does Mendota water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Mendota? ▼
Mendota (PWSID IL0990550). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2023-08-01. Inspectors recorded 1 significant deficiency.

What Should Mendota 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
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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