F0/100
Pewaukee Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 16,837 residents · Wisconsin
What's In Pewaukee's Tap Water?
31
Contaminants Tested
3
Exceed EPA Limits
1
Above EPA Goals
4 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFHxS | 0.069 µg/L | 0.010 µg/L | Over Limit |
PFOA | 0.009 µg/L | 0.004 µg/L | Over Limit |
PFOS | 0.008 µg/L | 0.004 µg/L | Over Limit |
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above 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
TIER 3Unresolved
Disinfection byproduct treatment technique failure
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
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)
TIER 3Unresolved
Disinfection byproduct treatment technique failure
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
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
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
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
Water Utility Details
PEWAUKEE CITY WATER AND SEWER UTILITY
Population Served
8,671
Water Source
Groundwater
System ID
WI2680214
PEWAUKEE VILLAGE WATERWORKS
Population Served
8,166
Water Source
Groundwater
System ID
WI2680229
Frequently Asked Questions About Pewaukee Water
Is Pewaukee tap water safe to drink?
Pewaukee, Wisconsin tap water receives a grade of F (0/100), which is considered failing. 3 contaminant(s) exceed EPA maximum contaminant levels and 151 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Pewaukee's water?
Of the 31 contaminants tested in Pewaukee's water supply, the most notable include PFHxS, PFOA, PFOS, Lead (90th percentile). 3 contaminant(s) exceed EPA legal limits (MCLs). 4 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Pewaukee have any water quality violations?
Yes, Pewaukee has 151 EPA violation(s) on record, with the most recent in 2025. Violation types include MCL, Other, TT. 59 of these are health-based violations, which are the most serious category.
Do I need a water filter in Pewaukee?
Based on EPA data, using a water filter in Pewaukee is recommended. 3 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does Pewaukee's tap water come from?
Pewaukee's drinking water is sourced from groundwater and supplied by PEWAUKEE CITY WATER AND SEWER UTILITY and 1 other water system(s). The system serves approximately 16,837 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Pewaukee's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Pewaukee's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Pewaukee's water compare to other cities in Wisconsin?
Pewaukee's water quality score of 0/100 earns a grade of F, which is considered failing. This is a concerning score that suggests significant water quality issues. Visit our Wisconsin state page to see how all cities in the state compare.
What should I do if I'm concerned about Pewaukee's water quality?
If you have concerns about Pewaukee's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (PEWAUKEE CITY WATER AND SEWER UTILITY) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.