PlainWater
States → Wisconsin

Non-Transient Non-Community Water System · PWS WI2521735

Yorkville Utility Dist 1

Union Grove, Wisconsin 53182 - drinking water served from groundwater sources to 3,900 people, tracked in EPA SDWIS and UCMR5.

3,900
People served
160
EPA violations
5
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 160 drinking-water violations at Yorkville Utility Dist 1, 3% of them health-based - above the Wisconsin per-system average.

160
Total EPA violations on record
3%
Health-based (MCL / treatment failure)
3,900
People served by this system
0
PFAS compounds detected (UCMR5)

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). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

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. Statewide, 78 of 202 UCMR5-tested systems have reported PFAS detections (38.6%).

Yorkville Utility Dist 1's 160 violations sit above the Wisconsin 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
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. 0 of 58 samples detected PFAS.

Contaminant Date Result MRL Status
PFTrDA 6/19/2023 <7.00 ppt 7.00 ppt Not Detected
6:2 FTS 6/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFDoA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 6/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 6/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFNA 6/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxS 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 6/19/2023 <6.00 ppt 6.00 ppt Not Detected
PFTA 6/19/2023 <8.00 ppt 8.00 ppt Not Detected
NEtFOSAA 6/19/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 6/19/2023 <5.00 ppt 5.00 ppt Not Detected
8:2 FTS 6/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 6/19/2023 <5.00 ppt 5.00 ppt Not Detected
ADONA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 6/19/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 6/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFUnA 6/19/2023 <2.00 ppt 2.00 ppt Not Detected
PFHxA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 6/19/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 6/19/2023 <20.00 ppt 20.00 ppt Not Detected
PFEESA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 6/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 6/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 12/18/2023 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 12/18/2023 <5.00 ppt 5.00 ppt Not Detected
PFUnA 12/18/2023 <2.00 ppt 2.00 ppt Not Detected
PFHxA 12/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 12/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 12/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 12/18/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 12/18/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxS 12/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 12/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 12/18/2023 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 12/18/2023 <2.00 ppt 2.00 ppt Not Detected
PFNA 12/18/2023 <4.00 ppt 4.00 ppt Not Detected
PFTrDA 12/18/2023 <7.00 ppt 7.00 ppt Not Detected
8:2 FTS 12/18/2023 <5.00 ppt 5.00 ppt Not Detected
ADONA 12/18/2023 <3.00 ppt 3.00 ppt Not Detected
NEtFOSAA 12/18/2023 <5.00 ppt 5.00 ppt Not Detected
PFTA 12/18/2023 <8.00 ppt 8.00 ppt Not Detected
PFHpS 12/18/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 12/18/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 12/18/2023 <20.00 ppt 20.00 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 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 None 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 (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 Yorkville Utility Dist 1 water safe to drink? ▼
Yorkville Utility Dist 1 (PWS ID: WI2521735) has 160 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. 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? ▼
No. Yorkville Utility Dist 1 was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
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.
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.