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MUKWONAGO WATERWORKS

PWS ID: WI2680209 · MUKWONAGO, Wisconsin 53149

MUKWONAGO WATERWORKS serves 8,190 people in MUKWONAGO, Wisconsin using Groundwater water sources. It has 284 recorded EPA violations, including 65 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: MUKWONAGO WATERWORKS

MUKWONAGO WATERWORKS is a local-owned community water system that delivers drinking water to 8,190 residents in MUKWONAGO, Wisconsin (Waukesha County) through 3,033 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 284 total violations for this system , of which 65 (23%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 209 monitoring and reporting violations are on file. The most recent violation on record dates to 2015.

The most frequently cited contaminant at this system is Gross Alpha, Excl. Radon and U, recorded in 34 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 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. MUKWONAGO WATERWORKS's 284 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.

Population Served
8,190
Total Violations
284
Health-Based Violations
65
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
3,033
County
Waukesha
School/Daycare
No
MCL Violations
65
Monitoring Violations
209
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Gross Alpha, Excl. Radon and U MCL 34 2001
Combined Radium (-226 and -228) MCL 31 2001
Gross Alpha, Excl. Radon and U MR 14 2011
Radium-228 MR 12 2011
Combined Radium (-226 and -228) MR 12 2011
Coliform (TCR) MR 11 2015
Chlorine MR 8 2015
TTHM MR 8 2005
Nitrate MR 7 2003
Radium-226 MR 6 2000
1,2,4-Trichlorobenzene MR 6 2003
cis-1,2-Dichloroethylene MR 6 2003
Xylenes, Total MR 6 2003
DICHLOROMETHANE MR 6 2003
o-Dichlorobenzene MR 6 2003
p-Dichlorobenzene MR 6 2003
Vinyl chloride MR 6 2003
trans-1,2-Dichloroethylene MR 6 2003
1,2-Dichloroethane MR 6 2003
1,1,1-Trichloroethane MR 6 2003
1,2-Dichloropropane MR 6 2003
Trichloroethylene MR 6 2003
1,1,2-Trichloroethane MR 6 2003
Tetrachloroethylene MR 6 2003
Benzene MR 6 2003
Toluene MR 6 2003
Ethylbenzene MR 6 2003
Styrene MR 6 2003
1,1-Dichloroethylene MR 6 2003
Carbon tetrachloride MR 6 2003

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 120 samples detected PFAS.

Contaminant Date Result MRL Status
PFEESA 9/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 9/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 9/24/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 9/24/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 9/24/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 9/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 9/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 9/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
lithium 9/24/2025 <9 µg/L 9 µg/L Not Detected
PFHpS 9/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 9/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 9/24/2025 <0.02 µg/L 0.02 µg/L Not Detected
6:2 FTS 9/24/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFMBA 9/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 9/24/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxA 9/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 9/24/2025 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 9/24/2025 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 9/24/2025 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 9/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 9/24/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 9/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 9/24/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 9/24/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 9/24/2025 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 9/24/2025 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 9/24/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 9/24/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 9/24/2025 <0.008 µg/L 0.008 µg/L Not Detected
HFPO-DA 9/24/2025 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 9/22/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 9/22/2025 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 9/22/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 9/22/2025 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 9/22/2025 <0.003 µg/L 0.003 µg/L Not Detected
lithium 9/22/2025 <9 µg/L 9 µg/L Not Detected
8:2 FTS 9/22/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 9/22/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFHpS 9/22/2025 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 9/22/2025 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 9/22/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFTA 9/22/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFNA 9/22/2025 <0.004 µg/L 0.004 µg/L Not Detected
9Cl-PF3ONS 9/22/2025 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 9/22/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 9/22/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 9/22/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 9/22/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 9/22/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 9/22/2025 <0.02 µg/L 0.02 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 MUKWONAGO WATERWORKS.

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 WI2680209 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 MUKWONAGO WATERWORKS 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
2015 Coliform (TCR) MR 11 SDWIS / WI2680209 / 3100
2015 Chlorine MR 8 SDWIS / WI2680209 / 0999
2012 Lead and Copper Rule MR 5 SDWIS / WI2680209 / 5000
2011 Gross Alpha, Excl. Radon and U MR 14 SDWIS / WI2680209 / 4000
2011 Radium-228 MR 12 SDWIS / WI2680209 / 4030
2011 Combined Radium (-226 and -228) MR 12 SDWIS / WI2680209 / 4010
2011 Public Notice Other 2 SDWIS / WI2680209 / 7500
2010 Consumer Confidence Rule Other 4 SDWIS / WI2680209 / 7000
2005 TTHM MR 8 SDWIS / WI2680209 / 2950
2003 Nitrate MR 7 SDWIS / WI2680209 / 1040
2003 1,2,4-Trichlorobenzene MR 6 SDWIS / WI2680209 / 2378
2003 cis-1,2-Dichloroethylene MR 6 SDWIS / WI2680209 / 2380
2003 Xylenes, Total MR 6 SDWIS / WI2680209 / 2955
2003 DICHLOROMETHANE MR 6 SDWIS / WI2680209 / 2964
2003 o-Dichlorobenzene MR 6 SDWIS / WI2680209 / 2968

How MUKWONAGO WATERWORKS Compares

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

Metric MUKWONAGO WATERWORKS Wisconsin avg Federal benchmark
Total violations 284 26 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 65 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 8,190 467 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 MUKWONAGO WATERWORKS water safe to drink? ▼
MUKWONAGO WATERWORKS (PWS ID: WI2680209) has 284 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 8,190 people using Groundwater sources.
How many people does MUKWONAGO WATERWORKS serve? ▼
MUKWONAGO WATERWORKS serves 8,190 people in MUKWONAGO, Wisconsin. It is a Local-owned system using Groundwater water sources with 3,033 service connections.
What type of violations does MUKWONAGO WATERWORKS have? ▼
MUKWONAGO WATERWORKS has 284 total violations: 65 health-based violations (MCL exceedances or treatment failures), 209 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in MUKWONAGO WATERWORKS water? ▼
No. MUKWONAGO WATERWORKS was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does MUKWONAGO WATERWORKS use? ▼
MUKWONAGO WATERWORKS 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