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Community Water System · PWS IL0670650

Warsaw

Warsaw, Illinois 62379 - drinking water served from surface water sources to 1,607 people, tracked in EPA SDWIS and UCMR5.

1,607
People served
106
EPA violations
50
Health-based
Untested
UCMR5 result

The verdict

EPA records 106 drinking-water violations at Warsaw, 47% of them health-based - above the Illinois per-system average.

106
Total EPA violations on record
47%
Health-based (MCL / treatment failure)
1,607
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Warsaw

Warsaw is a local-owned community water system that delivers drinking water to 1,607 residents in Warsaw, Illinois (Hancock County) through 805 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 106 total violations for this system , of which 50 (47%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 31 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 26 violations (TT, 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%).

Warsaw's 106 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
1,607
Total Violations
106
Health-Based Violations
50
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
805
County
Hancock
School/Daycare
No
MCL Violations
24
Monitoring Violations
31
Treatment Tech Violations
26

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule TT 26 1994
TTHM MCL 24 2009
Chloramine MR 12 2016
Public Notice Other 6 2005
CARBON, TOTAL MR 6 2023
Consumer Confidence Rule Other 2 2005
Surface Water Treatment Rule MR 2 1994
Total Haloacetic Acids (HAA5) MR 1 2025
Fluoride MR 1 1979
Selenium MR 1 1979
Nitrate MR 1 1979
Chromium MR 1 1979
Mercury MR 1 1979
Arsenic MR 1 1979
Barium MR 1 1979
Gross Alpha, Excl. Radon and U MR 1 1977
TTHM MR 1 2025
Cadmium MR 1 1979

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 Warsaw.

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 IL0670650 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 Warsaw 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
2025 Total Haloacetic Acids (HAA5) MR 1 SDWIS / IL0670650 / 2456
2025 TTHM MR 1 SDWIS / IL0670650 / 2950
2023 CARBON, TOTAL MR 6 SDWIS / IL0670650 / 2920
2016 Chloramine MR 12 SDWIS / IL0670650 / 1006
2009 TTHM MCL 24 SDWIS / IL0670650 / 2950
2005 Public Notice Other 6 SDWIS / IL0670650 / 7500
2005 Consumer Confidence Rule Other 2 SDWIS / IL0670650 / 7000
1994 Surface Water Treatment Rule TT 26 SDWIS / IL0670650 / 0200
1994 Surface Water Treatment Rule MR 2 SDWIS / IL0670650 / 0200
1979 Fluoride MR 1 SDWIS / IL0670650 / 1025
1979 Selenium MR 1 SDWIS / IL0670650 / 1045
1979 Nitrate MR 1 SDWIS / IL0670650 / 1040
1979 Chromium MR 1 SDWIS / IL0670650 / 1020
1979 Mercury MR 1 SDWIS / IL0670650 / 1035
1979 Arsenic MR 1 SDWIS / IL0670650 / 1005

How Warsaw Compares

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

Metric Warsaw Illinois avg Federal benchmark
Total violations 106 69.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 50 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 1,607 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 Warsaw water safe to drink? ▼
Warsaw (PWS ID: IL0670650) has 106 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,607 people using Surface Water sources.
How many people does Warsaw serve? ▼
Warsaw serves 1,607 people in Warsaw, Illinois. It is a Local-owned system using Surface Water water sources with 805 service connections.
What type of violations does Warsaw have? ▼
Warsaw has 106 total violations: 50 health-based violations (MCL exceedances or treatment failures), 31 monitoring/reporting violations, and 26 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Warsaw water? ▼
No PFAS testing data is available for Warsaw under the EPA's UCMR5 monitoring program.
What water source does Warsaw use? ▼
Warsaw uses Surface Water 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.