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PEWAUKEE CITY WATER AND SEWER UTILITY

PWS ID: WI2680214 · PEWAUKEE, Wisconsin 53072

PEWAUKEE CITY WATER AND SEWER UTILITY serves 8,671 people in PEWAUKEE, Wisconsin using Groundwater water sources. It has 467 recorded EPA violations, including 222 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (11 compounds found).

Water Quality Snapshot: PEWAUKEE CITY WATER AND SEWER UTILITY

PEWAUKEE CITY WATER AND SEWER UTILITY is a local-owned community water system that delivers drinking water to 8,671 residents in PEWAUKEE, Wisconsin (Waukesha County) through 3,211 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 467 total violations for this system , of which 222 (48%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 224 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 Gross Alpha, Excl. Radon and U, recorded in 117 violations (MCL, health-based). Under EPA's UCMR5 PFAS monitoring program, 11 PFAS compounds were 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. PEWAUKEE CITY WATER AND SEWER UTILITY's 467 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

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

Population Served
8,671
Total Violations
467
Health-Based Violations
222
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
3,211
County
Waukesha
School/Daycare
No
MCL Violations
222
Monitoring Violations
224
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Gross Alpha, Excl. Radon and U MCL 117 2025
Combined Radium (-226 and -228) MCL 105 2019
Radium-228 MR 23 2020
Gross Alpha, Excl. Radon and U MR 21 2020
Radium-226 MR 19 2018
Public Notice Other 13 2025
Coliform (TCR) MR 6 2001
Diquat MR 5 2014
Nitrate MR 5 2018
Combined Uranium MR 5 2006
Consumer Confidence Rule Other 4 2005
Chromium MR 4 2020
Cadmium MR 4 2020
Barium MR 4 2020
Mercury MR 4 2020
Nickel MR 4 2020
Selenium MR 4 2020
Beryllium, Total MR 4 2020
Thallium, Total MR 4 2020
Antimony, Total MR 4 2020
Combined Radium (-226 and -228) MR 4 2020
Tetrachloroethylene MR 4 2020
1,2,4-Trichlorobenzene MR 4 2020
Toluene MR 4 2020
Benzene MR 4 2020
Carbon tetrachloride MR 4 2020
1,1,1-Trichloroethane MR 4 2020
1,2-Dichloroethane MR 4 2020
1,1-Dichloroethylene MR 4 2020
p-Dichlorobenzene MR 4 2020

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 45 of 480 samples detected PFAS.

Contaminant Date Result MRL Status
PFHxA 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 6/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 6/24/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 6/24/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 6/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 6/24/2024 0.0031 µg/L 0.003 µg/L Detected
PFOS 6/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFUnA 6/24/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFDoA 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 6/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
HFPO-DA 6/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 6/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 6/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 6/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 6/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 6/24/2024 0.0033 µg/L 0.003 µg/L Detected
lithium 6/24/2024 9.2000 µg/L 9 µg/L Detected
NMeFOSAA 6/24/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFTA 6/24/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 6/24/2024 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 6/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFDA 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 6/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFDoA 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
lithium 6/24/2024 <9 µg/L 9 µg/L Not Detected
PFBS 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 6/24/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFHxS 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 6/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 6/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 6/24/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 6/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 6/24/2024 <0.002 µg/L 0.002 µg/L Not Detected
NEtFOSAA 6/24/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 6/24/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFPeS 6/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 6/24/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 6/24/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 6/24/2024 <0.005 µg/L 0.005 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 PEWAUKEE CITY WATER AND SEWER UTILITY.

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 WI2680214 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 PEWAUKEE CITY WATER AND SEWER UTILITY 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
2025 Gross Alpha, Excl. Radon and U MCL 117 SDWIS / WI2680214 / 4000
2025 Public Notice Other 13 SDWIS / WI2680214 / 7500
2020 Radium-228 MR 23 SDWIS / WI2680214 / 4030
2020 Gross Alpha, Excl. Radon and U MR 21 SDWIS / WI2680214 / 4000
2020 Chromium MR 4 SDWIS / WI2680214 / 1020
2020 Cadmium MR 4 SDWIS / WI2680214 / 1015
2020 Barium MR 4 SDWIS / WI2680214 / 1010
2020 Mercury MR 4 SDWIS / WI2680214 / 1035
2020 Nickel MR 4 SDWIS / WI2680214 / 1036
2020 Selenium MR 4 SDWIS / WI2680214 / 1045
2020 Beryllium, Total MR 4 SDWIS / WI2680214 / 1075
2020 Thallium, Total MR 4 SDWIS / WI2680214 / 1085
2020 Antimony, Total MR 4 SDWIS / WI2680214 / 1074
2020 Combined Radium (-226 and -228) MR 4 SDWIS / WI2680214 / 4010
2020 Tetrachloroethylene MR 4 SDWIS / WI2680214 / 2987

How PEWAUKEE CITY WATER AND SEWER UTILITY Compares

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

Metric PEWAUKEE CITY WATER AND SEWER UTILITY Wisconsin avg Federal benchmark
Total violations 467 26 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 222 5.3 Indicates a contaminant exceeded a federal MCL
PFAS detection 11 compounds 38.6% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 8,671 467 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 PEWAUKEE CITY WATER AND SEWER UTILITY water safe to drink? ▼
PEWAUKEE CITY WATER AND SEWER UTILITY (PWS ID: WI2680214) has 467 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 11 PFAS compounds found. This system serves 8,671 people using Groundwater sources.
How many people does PEWAUKEE CITY WATER AND SEWER UTILITY serve? ▼
PEWAUKEE CITY WATER AND SEWER UTILITY serves 8,671 people in PEWAUKEE, Wisconsin. It is a Local-owned system using Groundwater water sources with 3,211 service connections.
What type of violations does PEWAUKEE CITY WATER AND SEWER UTILITY have? ▼
PEWAUKEE CITY WATER AND SEWER UTILITY has 467 total violations: 222 health-based violations (MCL exceedances or treatment failures), 224 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in PEWAUKEE CITY WATER AND SEWER UTILITY water? ▼
Yes. UCMR5 testing detected 11 PFAS compounds in PEWAUKEE CITY WATER AND SEWER UTILITY's water supply: PFHxS, PFPeA, lithium, PFPeS, 6:2 FTS, and others. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does PEWAUKEE CITY WATER AND SEWER UTILITY use? ▼
PEWAUKEE CITY WATER AND SEWER UTILITY 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.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by PlainWater Editorial