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F0/100

PEWAUKEE CITY WATER AND SEWER UTILITY — Water Quality Report 2026

Serving 8,671 people · Wisconsin

Water Source
Groundwater
County
—
System ID
WI2680214
Violations
97

Contaminant Test Results

4 contaminants above EPA health goals
ContaminantDetectedLimit (MCL)Status
PFHxS
0.069 µg/L0.010 µg/LOver Limit
PFOA
0.009 µg/L0.004 µg/LOver Limit
PFOS
0.008 µg/L0.004 µg/LOver Limit
Lead (90th percentile)
0.003 mg/L0.015 mg/LAbove Goal

EPA Violation History

15

Violations (last 5yr)

13

Unresolved

9

Health-Related

TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: October 1, 2025 – December 15, 2025Verify on EPA.gov
TIER 3Unresolved

Disinfection byproduct treatment technique failure

When: August 18, 2025Rule: Ground Water RuleVerify on EPA.gov
TIER 3Unresolved

Disinfection byproduct treatment technique failure

When: August 18, 2025Rule: Ground Water RuleVerify on EPA.gov
TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: July 1, 2025 – September 30, 2025Enforcement: Formal — state order issuedVerify on EPA.gov
TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: April 1, 2025 – June 30, 2025Enforcement: Formal — state order issuedVerify on EPA.gov
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: March 3, 2025 – June 23, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: January 1, 2025 – March 31, 2025Enforcement: Formal — state order issuedVerify on EPA.gov
TIER 3Unresolved

Disinfection byproduct treatment technique failure

When: November 18, 2024Rule: Ground Water RuleVerify on EPA.gov
TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: October 1, 2024 – December 31, 2024Enforcement: Formal — state order issuedVerify on EPA.gov
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: August 29, 2024 – January 8, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved

Disinfection byproduct treatment technique failure

When: July 16, 2024Rule: Ground Water RuleVerify on EPA.gov
TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: July 1, 2024 – September 30, 2024Enforcement: Formal — state order issuedVerify on EPA.gov
TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: April 1, 2024 – June 30, 2024Enforcement: Formal — state order issuedVerify on EPA.gov
TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: January 1, 2024 – March 31, 2024Enforcement: Formal — state order issuedVerify on EPA.gov
TIER 2Unresolved

Exceeded the Maximum Contaminant Level (running average)

When: October 1, 2023 – December 31, 2023Enforcement: Formal — state order issuedVerify on EPA.gov

Understanding violation severity

Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.

Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly

Frequently Asked Questions About PEWAUKEE CITY WATER AND SEWER UTILITY

Is PEWAUKEE CITY WATER AND SEWER UTILITY water safe to drink?

PEWAUKEE CITY WATER AND SEWER UTILITY water receives a grade of F (0/100), which is considered failing. 3 contaminant(s) exceed EPA legal limits and 97 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has PEWAUKEE CITY WATER AND SEWER UTILITY detected?

31 contaminants were tested in PEWAUKEE CITY WATER AND SEWER UTILITY's water. Notable contaminants include PFHxS, PFOA, PFOS, Lead (90th percentile). 3 exceed EPA legal limits (MCLs). 4 exceed EPA health goals (MCLGs).

Does PEWAUKEE CITY WATER AND SEWER UTILITY have any EPA violations?

Yes, PEWAUKEE CITY WATER AND SEWER UTILITY has 97 EPA violation(s) on record, with the most recent in 2025. Violation types include MCL, Other, MR. 27 are health-based violations.

How many people does PEWAUKEE CITY WATER AND SEWER UTILITY serve?

PEWAUKEE CITY WATER AND SEWER UTILITY serves approximately 8,671 people, Wisconsin. The system provides water to 1 community: Pewaukee.

What type of water does PEWAUKEE CITY WATER AND SEWER UTILITY provide?

PEWAUKEE CITY WATER AND SEWER UTILITY sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI2680214.

How does PEWAUKEE CITY WATER AND SEWER UTILITY compare to other utilities in Wisconsin?

PEWAUKEE CITY WATER AND SEWER UTILITY scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Wisconsin state page for a full comparison of water systems.

Cities Served

Pewaukee