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Winthrop Harbor, IL Tap Water Quality 2026

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

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

Main Utility: Winthrop Harbor PWSID: IL0971950 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 5.70 ppb, 38% of the action level and no violations are open. No PFAS was detected.

C

Winthrop Harbor earns a C for water quality

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

Lead: 5.70 ppb — 38% of the federal action level
PFAS tested, none detected
27 violations since 2015, 0 health-based
No violations currently open
Winthrop Harbor's lead level vs. all Illinois community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 5.70 ppb — 38% of the federal action level
✓ Lower lead than 28% of Illinois utilities
Population Served
5592
~2172 connections
Water Source
Surface water
Purchased from another system — SDWIS source code SWP
Active Violations
0
27 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
38% of EPA action level
5.70 ppb
Action level: 15 ppb
The 90th-percentile lead result is 5.70 ppb, 38% 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 MONITORING AND REPORTING — TT 2026 Unaddressed
TTHM MONITORING AND REPORTING — 0.080 mg/L 2026 Archived
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2026 Archived
Consumer Confidence Rule OTHER — — 2025 Unaddressed
Public Notice OTHER — — 2025 Resolved
Public Notice OTHER — — 2024 Resolved
Public Notice OTHER — — 2024 Resolved
Consumer Confidence Rule OTHER — — 2024 Resolved
Consumer Confidence Rule OTHER — — 2024 Unaddressed
Lead and Copper Rule MONITORING AND REPORTING — TT 2023 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2023 Resolved
Consumer Confidence Rule OTHER — — 2023 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2023 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2023 Resolved
Consumer Confidence Rule OTHER — — 2023 Unaddressed
Lead and Copper Rule MONITORING AND REPORTING — TT 2022 Unaddressed
Lead and Copper Rule MONITORING AND REPORTING — TT 2021 Unaddressed
Public Notice OTHER — — 2021 Unaddressed
Consumer Confidence Rule OTHER — — 2021 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2020 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2020 Resolved
Consumer Confidence Rule OTHER — — 2019 Resolved
Consumer Confidence Rule OTHER — — 2018 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2017 Resolved
Consumer Confidence Rule OTHER — — 2017 Resolved
Consumer Confidence Rule OTHER — — 2016 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

27 violations are on record since 2015, of which 0 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Winthrop Harbor
PWSID IL0971950
Water source Surface water — Purchased from another system — SDWIS source code SWP
Population served 5,592
Service connections 2,172
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Winthrop Harbor tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 5.70 ppb, 38% of the action level.
Does Winthrop Harbor water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Winthrop Harbor? ▼
Winthrop Harbor (PWSID IL0971950), one of 2 systems serving this area. Surface water. Purchased from another system — SDWIS source code SWP
When was this system last inspected? ▼
It was last inspected on 2025-04-22. Inspectors recorded 3 significant deficiencies.

What Should Winthrop Harbor 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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