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Frankfort, IL Tap Water Quality 2026

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

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

Main Utility: Frankfort PWSID: IL1970400 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 0.98 ppb, 7% of the action level and no violations are open. No PFAS was detected.

B

Frankfort earns a B for water quality

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

Lead: 0.98 ppb — 7% of the federal action level
PFAS tested, none detected
16 violations since 2015, 0 health-based
No violations currently open
Frankfort's lead level vs. all Illinois community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 0.98 ppb — 7% of the federal action level
✓ Lower lead than 93% of Illinois utilities
Population Served
20106
~10823 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
16 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
7% of EPA action level
0.98 ppb
Action level: 15 ppb
The 90th-percentile lead result is 0.98 ppb, 7% 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
Consumer Confidence Rule OTHER — — 2025 Unaddressed
Xylenes, Total MONITORING AND REPORTING — 10 mg/L 2024 Resolved
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2024 Resolved
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2021 Resolved
Consumer Confidence Rule OTHER — — 2018 Resolved
Pentachlorophenol MONITORING AND REPORTING — 0.001 mg/L 2018 Resolved
OXAMYL MONITORING AND REPORTING — 0.2 mg/L 2017–2019 Resolved
Carbofuran MONITORING AND REPORTING — 0.04 mg/L 2017–2019 Resolved
Simazine MONITORING AND REPORTING — 0.004 mg/L 2017–2019 Resolved
Atrazine MONITORING AND REPORTING — 0.003 mg/L 2017–2019 Resolved
Di(2-ethylhexyl) adipate MONITORING AND REPORTING — 0.4 mg/L 2017–2019 Resolved
Endothall MONITORING AND REPORTING — 0.1 mg/L 2017–2019 Resolved
Di(2-ethylhexyl) phthalate MONITORING AND REPORTING — 0.006 mg/L 2017–2019 Resolved
Diquat MONITORING AND REPORTING — 0.02 mg/L 2017–2019 Resolved
Benzo(a)pyrene MONITORING AND REPORTING — 0.0002 mg/L 2017–2019 Resolved
LASSO MONITORING AND REPORTING — — 2017–2019 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

16 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 Frankfort
PWSID IL1970400
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 20,106
Service connections 10,823
Systems serving this area 3
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Frankfort tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 0.98 ppb, 7% of the action level.
Does Frankfort water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Frankfort? ▼
Frankfort (PWSID IL1970400), one of 3 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-09-22. Inspectors recorded 4 significant deficiencies.

What Should Frankfort Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
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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