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Community Water System · PWS IL0110800

Ohio

Ohio, Illinois 61349 - drinking water served from groundwater sources to 465 people, tracked in EPA SDWIS and UCMR5.

465
People served
157
EPA violations
100
Health-based
Untested
UCMR5 result

The verdict

EPA records 157 drinking-water violations at Ohio, 64% of them health-based - above the Illinois per-system average.

157
Total EPA violations on record
64%
Health-based (MCL / treatment failure)
465
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Ohio

Ohio is a local-owned community water system that delivers drinking water to 465 residents in Ohio, Illinois (Bureau County) through 246 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 157 total violations for this system , of which 100 (64%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 42 monitoring and reporting violations are on file. The most recent violation on record dates to 2009.

The most frequently cited contaminant at this system is Arsenic, recorded in 94 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%).

Ohio's 157 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
465
Total Violations
157
Health-Based Violations
100
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
246
County
Bureau
School/Daycare
No
MCL Violations
100
Monitoring Violations
42
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MCL 94 2009
Coliform (TCR) MR 6 1992
Total Haloacetic Acids (HAA5) MCL 6 2007
1,1-Dichloroethylene MR 5 1991
Trichloroethylene MR 5 1991
p-Dichlorobenzene MR 5 1991
Carbon tetrachloride MR 5 1991
1,2-Dichloroethane MR 5 1991
Benzene MR 5 1991
1,1,1-Trichloroethane MR 5 1991
Consumer Confidence Rule Other 2 2009
Gross Alpha, Excl. Radon and U MR 1 1977

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 Ohio.

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 IL0110800 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 Ohio 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
2009 Arsenic MCL 94 SDWIS / IL0110800 / 1005
2009 Consumer Confidence Rule Other 2 SDWIS / IL0110800 / 7000
2007 Total Haloacetic Acids (HAA5) MCL 6 SDWIS / IL0110800 / 2456
1992 Coliform (TCR) MR 6 SDWIS / IL0110800 / 3100
1991 1,1-Dichloroethylene MR 5 SDWIS / IL0110800 / 2977
1991 Trichloroethylene MR 5 SDWIS / IL0110800 / 2984
1991 p-Dichlorobenzene MR 5 SDWIS / IL0110800 / 2969
1991 Carbon tetrachloride MR 5 SDWIS / IL0110800 / 2982
1991 1,2-Dichloroethane MR 5 SDWIS / IL0110800 / 2980
1991 Benzene MR 5 SDWIS / IL0110800 / 2990
1991 1,1,1-Trichloroethane MR 5 SDWIS / IL0110800 / 2981
1977 Gross Alpha, Excl. Radon and U MR 1 SDWIS / IL0110800 / 4000

How Ohio Compares

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

Metric Ohio Illinois avg Federal benchmark
Total violations 157 69.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 100 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 465 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 Ohio water safe to drink? ▼
Ohio (PWS ID: IL0110800) has 157 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 465 people using Groundwater sources.
How many people does Ohio serve? ▼
Ohio serves 465 people in Ohio, Illinois. It is a Local-owned system using Groundwater water sources with 246 service connections.
What type of violations does Ohio have? ▼
Ohio has 157 total violations: 100 health-based violations (MCL exceedances or treatment failures), 42 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Ohio water? ▼
No PFAS testing data is available for Ohio under the EPA's UCMR5 monitoring program.
What water source does Ohio use? ▼
Ohio 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.