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YORKVILLE UTILITY DIST 1

PWS ID: WI2521735 · UNION GROVE, Wisconsin 53182

YORKVILLE UTILITY DIST 1 serves 3,900 people in UNION GROVE, Wisconsin using Groundwater water sources. It has 160 recorded EPA violations, including 5 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (1 compound found).

Water Quality Snapshot: YORKVILLE UTILITY DIST 1

YORKVILLE UTILITY DIST 1 is a local-owned non-transient non-community water system that delivers drinking water to 3,900 residents in UNION GROVE, Wisconsin (Racine County) through 36 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 160 total violations for this system , of which 5 (3%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 142 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Public Notice, recorded in 13 violations (Other). Under EPA's UCMR5 PFAS monitoring program, 1 PFAS compound was detected in samples collected from this system, with a maximum reported concentration of 11 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

Across Wisconsin, EPA tracks 10,988 public water systems serving 5,131,439 people, with 285,161 cumulative violations and 58,688 health-based violations on record. About 72% of systems in the state carry at least one violation, and state-wide the average per system is 26 violations. YORKVILLE UTILITY DIST 1's 160 violations sit above the Wisconsin average. Statewide, 78 of 202 UCMR5-tested systems have reported PFAS detections (38.6%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

PFAS Detected

1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
3,900
Total Violations
160
Health-Based Violations
5
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Local
Connections
36
County
Racine
School/Daycare
No
MCL Violations
5
Monitoring Violations
142
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Public Notice Other 13 2023
Lead and Copper Rule MR 12 2024
Revised Total Coliform Rule MON 12 2021
E. COLI MR 8 2023
Coliform (TCR) MR 7 2013
Chlorine MR 5 2013
Coliform (TCR) MCL 5 2013
Total Haloacetic Acids (HAA5) MR 4 2018
TTHM MR 4 2018
HEXACHLOROBENZENE MR 2 1995
Endrin MR 2 1995
Toxaphene MR 2 1995
Dalapon MR 2 1995
Simazine MR 2 1995
Picloram MR 2 1995
Dinoseb MR 2 1995
Aldicarb sulfoxide MR 2 1995
Aldicarb sulfone MR 2 1995
Carbofuran MR 2 1995
Heptachlor MR 2 1995
2,4-D MR 2 1995
2,4,5-TP MR 2 1995
Pentachlorophenol MR 2 1995
Vinyl chloride MR 2 1995
o-Dichlorobenzene MR 2 1995
Ethylbenzene MR 2 1995
cis-1,2-Dichloroethylene MR 2 1995
DICHLOROMETHANE MR 2 1995
1,1,1-Trichloroethane MR 2 1995
1,1,2-Trichloroethane MR 2 1995

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 1 of 60 samples detected PFAS.

Contaminant Date Result MRL Status
PFTrDA 6/19/2023 <0.007 µg/L 0.007 µg/L Not Detected
6:2 FTS 6/19/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFDoA 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 6/19/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 6/19/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 6/19/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 6/19/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFTA 6/19/2023 <0.008 µg/L 0.008 µg/L Not Detected
NEtFOSAA 6/19/2023 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
lithium 6/19/2023 11.0000 µg/L 9 µg/L Detected
HFPO-DA 6/19/2023 <0.005 µg/L 0.005 µg/L Not Detected
8:2 FTS 6/19/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 6/19/2023 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 6/19/2023 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 6/19/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 6/19/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 6/19/2023 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 6/19/2023 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 6/19/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 6/19/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 12/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 12/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 12/18/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 12/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 12/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 12/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 12/18/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 12/18/2023 <0.004 µg/L 0.004 µg/L Not Detected
lithium 12/18/2023 <9 µg/L 9 µg/L Not Detected
PFHxS 12/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 12/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 12/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 12/18/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFNA 12/18/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFTrDA 12/18/2023 <0.007 µg/L 0.007 µg/L Not Detected
8:2 FTS 12/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 12/18/2023 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 12/18/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFTA 12/18/2023 <0.008 µg/L 0.008 µg/L Not Detected
PFHpS 12/18/2023 <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 YORKVILLE UTILITY DIST 1.

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 WI2521735 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Wisconsin Drinking Water Authority

Wisconsin DNR — Drinking Water and Groundwater is the primacy agency that licenses and inspects YORKVILLE UTILITY DIST 1 under EPA-delegated authority.

Open WI regulator portal

Source: Wisconsin DNR — Drinking Water and Groundwater

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
2024 Lead and Copper Rule MR 12 SDWIS / WI2521735 / 5000
2023 Public Notice Other 13 SDWIS / WI2521735 / 7500
2023 E. COLI MR 8 SDWIS / WI2521735 / 3014
2021 Revised Total Coliform Rule MON 12 SDWIS / WI2521735 / 8000
2018 Total Haloacetic Acids (HAA5) MR 4 SDWIS / WI2521735 / 2456
2018 TTHM MR 4 SDWIS / WI2521735 / 2950
2013 Coliform (TCR) MR 7 SDWIS / WI2521735 / 3100
2013 Chlorine MR 5 SDWIS / WI2521735 / 0999
2013 Coliform (TCR) MCL 5 SDWIS / WI2521735 / 3100
1995 HEXACHLOROBENZENE MR 2 SDWIS / WI2521735 / 2274
1995 Endrin MR 2 SDWIS / WI2521735 / 2005
1995 Toxaphene MR 2 SDWIS / WI2521735 / 2020
1995 Dalapon MR 2 SDWIS / WI2521735 / 2031
1995 Simazine MR 2 SDWIS / WI2521735 / 2037
1995 Picloram MR 2 SDWIS / WI2521735 / 2040

How YORKVILLE UTILITY DIST 1 Compares

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

Metric YORKVILLE UTILITY DIST 1 Wisconsin avg Federal benchmark
Total violations 160 26 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 5 5.3 Indicates a contaminant exceeded a federal MCL
PFAS detection 1 compound 38.6% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 3,900 467 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 10,988 regulated public water systems in Wisconsin.

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 YORKVILLE UTILITY DIST 1 water safe to drink? ▼
YORKVILLE UTILITY DIST 1 (PWS ID: WI2521735) has 160 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 1 PFAS compound found. This system serves 3,900 people using Groundwater sources.
How many people does YORKVILLE UTILITY DIST 1 serve? ▼
YORKVILLE UTILITY DIST 1 serves 3,900 people in UNION GROVE, Wisconsin. It is a Local-owned system using Groundwater water sources with 36 service connections.
What type of violations does YORKVILLE UTILITY DIST 1 have? ▼
YORKVILLE UTILITY DIST 1 has 160 total violations: 5 health-based violations (MCL exceedances or treatment failures), 142 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in YORKVILLE UTILITY DIST 1 water? ▼
Yes. UCMR5 testing detected 1 PFAS compound in YORKVILLE UTILITY DIST 1's water supply: lithium. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does YORKVILLE UTILITY DIST 1 use? ▼
YORKVILLE UTILITY DIST 1 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.

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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