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Non-Transient Non-Community Water System · PWS IL3088518

Cog Hill Country Club

Lemont, Illinois 60439 - drinking water served from groundwater sources to 340 people, tracked in EPA SDWIS and UCMR5.

340
People served
1,849
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 1,849 drinking-water violations at Cog Hill Country Club - above the Illinois per-system average.

1,849
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
340
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Cog Hill Country Club

Cog Hill Country Club is a private-owned non-transient non-community water system that delivers drinking water to 340 residents in Lemont, Illinois (Cook County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 1,849 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 1,830 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 Toxaphene, recorded in 44 violations (MR). 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%).

Cog Hill Country Club's 1,849 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
340
Total Violations
1,849
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
1
County
Cook
School/Daycare
No
MCL Violations
0
Monitoring Violations
1,830
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Toxaphene MR 44 2023
Carbofuran MR 44 2023
Atrazine MR 44 2023
2,4-D MR 44 2023
Total Polychlorinated Biphenyls (PCB) MR 44 2023
Chlordane MR 44 2023
Methoxychlor MR 44 2023
Heptachlor MR 44 2023
Heptachlor epoxide MR 44 2023
2,4,5-TP MR 44 2023
ETHYLENE DIBROMIDE MR 44 2023
BHC-GAMMA MR 44 2023
LASSO MR 44 2023
1,2-DIBROMO-3-CHLOROPROPANE MR 44 2023
Pentachlorophenol MR 44 2023
1,2,4-Trichlorobenzene MR 40 2023
cis-1,2-Dichloroethylene MR 40 2023
DICHLOROMETHANE MR 40 2023
o-Dichlorobenzene MR 40 2023
Vinyl chloride MR 40 2023
1,2-Dichloroethane MR 40 2023
1,2-Dichloropropane MR 40 2023
Trichloroethylene MR 40 2023
1,1,2-Trichloroethane MR 40 2023
Tetrachloroethylene MR 40 2023
Ethylbenzene MR 40 2023
Xylenes, Total MR 40 2023
p-Dichlorobenzene MR 40 2023
trans-1,2-Dichloroethylene MR 40 2023
Carbon tetrachloride MR 40 2023

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 Cog Hill Country Club.

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 IL3088518 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 Cog Hill Country Club 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 Lead and Copper Rule MR 32 SDWIS / IL3088518 / 5000
2023 Toxaphene MR 44 SDWIS / IL3088518 / 2020
2023 Carbofuran MR 44 SDWIS / IL3088518 / 2046
2023 Atrazine MR 44 SDWIS / IL3088518 / 2050
2023 2,4-D MR 44 SDWIS / IL3088518 / 2105
2023 Total Polychlorinated Biphenyls (PCB) MR 44 SDWIS / IL3088518 / 2383
2023 Chlordane MR 44 SDWIS / IL3088518 / 2959
2023 Methoxychlor MR 44 SDWIS / IL3088518 / 2015
2023 Heptachlor MR 44 SDWIS / IL3088518 / 2065
2023 Heptachlor epoxide MR 44 SDWIS / IL3088518 / 2067
2023 2,4,5-TP MR 44 SDWIS / IL3088518 / 2110
2023 ETHYLENE DIBROMIDE MR 44 SDWIS / IL3088518 / 2946
2023 BHC-GAMMA MR 44 SDWIS / IL3088518 / 2010
2023 LASSO MR 44 SDWIS / IL3088518 / 2051
2023 1,2-DIBROMO-3-CHLOROPROPANE MR 44 SDWIS / IL3088518 / 2931

How Cog Hill Country Club Compares

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

Metric Cog Hill Country Club Illinois avg Federal benchmark
Total violations 1,849 69.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 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 340 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 Cog Hill Country Club water safe to drink? ▼
Cog Hill Country Club (PWS ID: IL3088518) has 1849 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 340 people using Groundwater sources.
How many people does Cog Hill Country Club serve? ▼
Cog Hill Country Club serves 340 people in Lemont, Illinois. It is a Private-owned system using Groundwater water sources with 1 service connections.
What type of violations does Cog Hill Country Club have? ▼
Cog Hill Country Club has 1,849 total violations: 0 health-based violations (MCL exceedances or treatment failures), 1,830 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Cog Hill Country Club water? ▼
No PFAS testing data is available for Cog Hill Country Club under the EPA's UCMR5 monitoring program.
What water source does Cog Hill Country Club use? ▼
Cog Hill Country Club uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.