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LE ROY

PWS ID: IL1130750 · LEROY, Illinois 61752

LE ROY serves 3,498 people in LEROY, Illinois using Groundwater water sources. It has 105 recorded EPA violations, including 64 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: LE ROY

LE ROY is a local-owned community water system that delivers drinking water to 3,498 residents in LEROY, Illinois (McLean County) through 1,549 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 105 total violations for this system , of which 64 (61%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 29 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 Coliform (TCR), recorded in 30 violations (MCL, health-based). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

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. LE ROY's 105 violations sit above the Illinois average. Statewide, 199 of 487 UCMR5-tested systems have reported PFAS detections (40.9%). 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
3,498
Total Violations
105
Health-Based Violations
64
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
1,549
County
McLean
School/Daycare
No
MCL Violations
54
Monitoring Violations
29
Treatment Tech Violations
10

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 30 2015
Total Haloacetic Acids (HAA5) MCL 18 2025
Lead and Copper Rule TT 10 2023
Coliform (TCR) MR 8 2005
Public Notice Other 7 2023
Total Haloacetic Acids (HAA5) MR 7 2024
Arsenic MCL 6 2006
TTHM MR 4 2022
Arsenic MR 4 2022
Consumer Confidence Rule Other 3 2025
Lead and Copper Rule MR 3 2001
Nitrite MR 2 2005
LEAD AND COPPER RULE REVISIONS RPT 2 2025
Gross Alpha, Excl. Radon and U MR 1 1977

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 60 samples detected PFAS.

Contaminant Date Result MRL Status
PFNA 7/12/2023 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 7/12/2023 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 7/12/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 7/12/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 7/12/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 7/12/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFPeS 7/12/2023 <0.004 µg/L 0.004 µg/L Not Detected
NEtFOSAA 7/12/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 7/12/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 7/12/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 7/12/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 7/12/2023 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 7/12/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFTA 7/12/2023 <0.008 µg/L 0.008 µg/L Not Detected
4:2 FTS 7/12/2023 <0.003 µg/L 0.003 µg/L Not Detected
lithium 7/12/2023 <9 µg/L 9 µg/L Not Detected
PFMPA 7/12/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFTrDA 7/12/2023 <0.007 µg/L 0.007 µg/L Not Detected
8:2 FTS 7/12/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 7/12/2023 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 7/12/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 7/12/2023 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 7/12/2023 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 7/12/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 7/12/2023 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 7/12/2023 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 7/12/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 7/12/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 7/12/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 7/12/2023 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 1/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 1/18/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 1/18/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFDoA 1/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 1/18/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 1/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 1/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 1/18/2023 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 1/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 1/18/2023 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 1/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 1/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFHxS 1/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 1/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
lithium 1/18/2023 <9 µg/L 9 µg/L Not Detected
8:2 FTS 1/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 1/18/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 1/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 1/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 1/18/2023 <0.003 µg/L 0.003 µg/L Not Detected

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 LE ROY.

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 IL1130750 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 LE ROY 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) MCL 18 SDWIS / IL1130750 / 2456
2025 Consumer Confidence Rule Other 3 SDWIS / IL1130750 / 7000
2025 LEAD AND COPPER RULE REVISIONS RPT 2 SDWIS / IL1130750 / 5200
2024 Total Haloacetic Acids (HAA5) MR 7 SDWIS / IL1130750 / 2456
2023 Lead and Copper Rule TT 10 SDWIS / IL1130750 / 5000
2023 Public Notice Other 7 SDWIS / IL1130750 / 7500
2022 TTHM MR 4 SDWIS / IL1130750 / 2950
2022 Arsenic MR 4 SDWIS / IL1130750 / 1005
2015 Coliform (TCR) MCL 30 SDWIS / IL1130750 / 3100
2006 Arsenic MCL 6 SDWIS / IL1130750 / 1005
2005 Coliform (TCR) MR 8 SDWIS / IL1130750 / 3100
2005 Nitrite MR 2 SDWIS / IL1130750 / 1041
2001 Lead and Copper Rule MR 3 SDWIS / IL1130750 / 5000
1977 Gross Alpha, Excl. Radon and U MR 1 SDWIS / IL1130750 / 4000

How LE ROY Compares

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

Metric LE ROY Illinois avg Federal benchmark
Total violations 105 69.4 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 64 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 3,498 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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is LE ROY water safe to drink? ▼
LE ROY (PWS ID: IL1130750) has 105 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 3,498 people using Groundwater sources.
How many people does LE ROY serve? ▼
LE ROY serves 3,498 people in LEROY, Illinois. It is a Local-owned system using Groundwater water sources with 1,549 service connections.
What type of violations does LE ROY have? ▼
LE ROY has 105 total violations: 64 health-based violations (MCL exceedances or treatment failures), 29 monitoring/reporting violations, and 10 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in LE ROY water? ▼
No. LE ROY was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does LE ROY use? ▼
LE ROY 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.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

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

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by PlainWater Editorial