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Community Water System · PWS IL2030400

Minonk

Minonk, Illinois 61760 - drinking water served from groundwater sources to 1,928 people, tracked in EPA SDWIS and UCMR5.

1,928
People served
151
EPA violations
88
Health-based
Untested
UCMR5 result

The verdict

EPA records 151 drinking-water violations at Minonk, 58% of them health-based - above the Illinois per-system average.

151
Total EPA violations on record
58%
Health-based (MCL / treatment failure)
1,928
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Minonk

Minonk is a local-owned community water system that delivers drinking water to 1,928 residents in Minonk, Illinois (Woodford County) through 988 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 151 total violations for this system , of which 88 (58%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 60 monitoring and reporting violations are on file. The most recent violation on record dates to 2002.

The most frequently cited contaminant at this system is Gross Alpha, Excl. Radon and U, recorded in 39 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Illinois, EPA tracks 5,117 public water systems serving 12,576,876 people, with 355,322 cumulative violations and 52,932 health-based violations on record. About 81% of systems in the state carry at least one violation, and state-wide the average per system is 69.4 violations. Statewide, 199 of 487 UCMR5-tested systems have reported PFAS detections (40.9%).

Minonk's 151 violations sit above the Illinois average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
1,928
Total Violations
151
Health-Based Violations
88
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
988
County
Woodford
School/Daycare
No
MCL Violations
88
Monitoring Violations
60
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Gross Alpha, Excl. Radon and U MCL 39 1989
Combined Radium (-226 and -228) MCL 36 1993
Fluoride MCL 13 1985
Gross Alpha, Excl. Radon and U MR 4 2002
Xylenes, Total MR 3 1992
p-Dichlorobenzene MR 3 1992
1,1-Dichloroethylene MR 3 1992
Carbon tetrachloride MR 3 1992
1,2-Dichloropropane MR 3 1992
CHLOROBENZENE MR 3 1992
Toluene MR 3 1992
Ethylbenzene MR 3 1992
Combined Radium (-226 and -228) MR 3 2002
cis-1,2-Dichloroethylene MR 3 1992
Trichloroethylene MR 3 1992
1,1,1-Trichloroethane MR 3 1992
trans-1,2-Dichloroethylene MR 3 1992
Benzene MR 3 1992
1,2-Dichloroethane MR 3 1992
Tetrachloroethylene MR 3 1992
o-Dichlorobenzene MR 3 1992
Styrene MR 3 1992
Lead and Copper Rule MR 2 1996

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Minonk.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID IL2030400 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Illinois Drinking Water Authority

Illinois EPA, Bureau of Water is the primacy agency that licenses and inspects Minonk under EPA-delegated authority.

Open IL regulator portal

Source: Illinois EPA, Bureau of Water

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2002 Gross Alpha, Excl. Radon and U MR 4 SDWIS / IL2030400 / 4000
2002 Combined Radium (-226 and -228) MR 3 SDWIS / IL2030400 / 4010
1996 Lead and Copper Rule MR 2 SDWIS / IL2030400 / 5000
1993 Combined Radium (-226 and -228) MCL 36 SDWIS / IL2030400 / 4010
1992 Xylenes, Total MR 3 SDWIS / IL2030400 / 2955
1992 p-Dichlorobenzene MR 3 SDWIS / IL2030400 / 2969
1992 1,1-Dichloroethylene MR 3 SDWIS / IL2030400 / 2977
1992 Carbon tetrachloride MR 3 SDWIS / IL2030400 / 2982
1992 1,2-Dichloropropane MR 3 SDWIS / IL2030400 / 2983
1992 CHLOROBENZENE MR 3 SDWIS / IL2030400 / 2989
1992 Toluene MR 3 SDWIS / IL2030400 / 2991
1992 Ethylbenzene MR 3 SDWIS / IL2030400 / 2992
1992 cis-1,2-Dichloroethylene MR 3 SDWIS / IL2030400 / 2380
1992 Trichloroethylene MR 3 SDWIS / IL2030400 / 2984
1992 1,1,1-Trichloroethane MR 3 SDWIS / IL2030400 / 2981

How Minonk Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Minonk Illinois avg Federal benchmark
Total violations 151 69.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 88 10.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 40.9% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,928 2,458 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 5,117 regulated public water systems in Illinois.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Minonk water safe to drink? ▼
Minonk (PWS ID: IL2030400) has 151 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,928 people using Groundwater sources.
How many people does Minonk serve? ▼
Minonk serves 1,928 people in Minonk, Illinois. It is a Local-owned system using Groundwater water sources with 988 service connections.
What type of violations does Minonk have? ▼
Minonk has 151 total violations: 88 health-based violations (MCL exceedances or treatment failures), 60 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Minonk water? ▼
No PFAS testing data is available for Minonk under the EPA's UCMR5 monitoring program.
What water source does Minonk use? ▼
Minonk uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.