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Community Water System · PWS IL0890950

West Dundee

West Dundee, Illinois 60118 - drinking water served from groundwater sources to 7,845 people, tracked in EPA SDWIS and UCMR5.

7,845
People served
111
EPA violations
44
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 111 drinking-water violations at West Dundee, 40% of them health-based - above the Illinois per-system average.

111
Total EPA violations on record
40%
Health-based (MCL / treatment failure)
7,845
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: West Dundee

West Dundee is a local-owned community water system that delivers drinking water to 7,845 residents in West Dundee, Illinois (Kane County) through 2,444 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 111 total violations for this system , of which 44 (40%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 53 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Barium, 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. Statewide, 199 of 487 UCMR5-tested systems have reported PFAS detections (40.9%).

West Dundee's 111 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
7,845
Total Violations
111
Health-Based Violations
44
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
2,444
County
Kane
School/Daycare
No
MCL Violations
37
Monitoring Violations
53
Treatment Tech Violations
7

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Barium MCL 30 2014
Coliform (TCR) MR 9 1994
Lead and Copper Rule TT 7 1993
Combined Radium (-226 and -228) MCL 7 1985
Arsenic MR 4 1986
Barium MR 4 1986
Cadmium MR 4 1986
Chromium MR 4 1986
Fluoride MR 4 1986
TTHM MR 4 2018
Mercury MR 4 1986
Nitrate MR 4 1986
Total Haloacetic Acids (HAA5) MR 4 2018
Selenium MR 4 1986
Combined Radium (-226 and -228) MR 2 2021
Lead and Copper Rule MR 1 1992
Gross Alpha, Excl. Radon and U MR 1 1977

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 116 samples detected PFAS.

Contaminant Date Result MRL Status
PFMBA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 4/3/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFPeS 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 4/3/2023 <20.00 ppt 20.00 ppt Not Detected
PFPeA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFBS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
NMeFOSAA 4/3/2023 <6.00 ppt 6.00 ppt Not Detected
PFHxS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 4/3/2023 <8.00 ppt 8.00 ppt Not Detected
PFUnA 4/3/2023 <2.00 ppt 2.00 ppt Not Detected
NEtFOSAA 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFHpA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFTrDA 4/3/2023 <7.00 ppt 7.00 ppt Not Detected
PFDoA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 4/3/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 4/3/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
NFDHA 4/3/2023 <20.00 ppt 20.00 ppt Not Detected
NMeFOSAA 4/3/2023 <6.00 ppt 6.00 ppt Not Detected
PFTrDA 4/3/2023 <7.00 ppt 7.00 ppt Not Detected
PFOA 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFBA 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
NEtFOSAA 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFPeS 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFTA 4/3/2023 <8.00 ppt 8.00 ppt 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 West Dundee.

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 IL0890950 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 West Dundee 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
2021 Combined Radium (-226 and -228) MR 2 SDWIS / IL0890950 / 4010
2018 TTHM MR 4 SDWIS / IL0890950 / 2950
2018 Total Haloacetic Acids (HAA5) MR 4 SDWIS / IL0890950 / 2456
2014 Barium MCL 30 SDWIS / IL0890950 / 1010
1994 Coliform (TCR) MR 9 SDWIS / IL0890950 / 3100
1993 Lead and Copper Rule TT 7 SDWIS / IL0890950 / 5000
1992 Lead and Copper Rule MR 1 SDWIS / IL0890950 / 5000
1986 Arsenic MR 4 SDWIS / IL0890950 / 1005
1986 Barium MR 4 SDWIS / IL0890950 / 1010
1986 Cadmium MR 4 SDWIS / IL0890950 / 1015
1986 Chromium MR 4 SDWIS / IL0890950 / 1020
1986 Fluoride MR 4 SDWIS / IL0890950 / 1025
1986 Mercury MR 4 SDWIS / IL0890950 / 1035
1986 Nitrate MR 4 SDWIS / IL0890950 / 1040
1986 Selenium MR 4 SDWIS / IL0890950 / 1045

How West Dundee Compares

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

Metric West Dundee Illinois avg Federal benchmark
Total violations 111 69.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 44 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 7,845 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 West Dundee water safe to drink? ▼
West Dundee (PWS ID: IL0890950) has 111 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 7,845 people using Groundwater sources.
How many people does West Dundee serve? ▼
West Dundee serves 7,845 people in West Dundee, Illinois. It is a Local-owned system using Groundwater water sources with 2,444 service connections.
What type of violations does West Dundee have? ▼
West Dundee has 111 total violations: 44 health-based violations (MCL exceedances or treatment failures), 53 monitoring/reporting violations, and 7 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in West Dundee water? ▼
No. West Dundee was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does West Dundee use? ▼
West Dundee 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. 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.

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.