Water Quality in Pewaukee, WI: 49 Violations — Grade D
Grade D · Score 40/100 · 5 water systems · Updated 2026-05-03
Pewaukee's water has significant violations. Water testing and filtration are recommended.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
EPA monitoring has flagged 49 reportable events for water systems in Pewaukee, WI.
Water Quality by ZIP Code in Pewaukee
Water quality varies across Pewaukee's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 53072 | D | 40 | 49 | 27 | View report → |
Violation Trend
EPA violations recorded for water systems serving Pewaukee.
Water Quality Overview
Pewaukee, Wisconsin receives a water quality grade of D with an overall score of 40 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 5 water systems serving Pewaukee have accumulated 49 EPA violations, including 27 health-based violations. These violations are tracked across 1 ZIP codes serving approximately 17,668 people.
What Grade D Means
A grade of D indicates significant compliance issues. Pewaukee's water systems have accumulated violations that suggest ongoing water quality challenges. Residents should check their specific ZIP code report and consider water testing or filtration.
Lead Levels
The average 90th percentile lead level across Pewaukee water systems is 0.0026 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
Radon Risk
Pewaukee is in EPA Radon Zone 1 (High risk). The EPA recommends all homes in Zone 1 areas be tested for radon. Radon is the second leading cause of lung cancer after smoking.
Water Systems Serving Pewaukee
Pewaukee is served by 5 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 17,668 people across 1 ZIP codes.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 10 enforcement actions against water systems serving Pewaukee. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Pewaukee
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
Request your CCR — your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test — certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration — NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories — monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Pewaukee Water Systems
The following contaminants have been detected or caused violations across Pewaukee's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Gross Alpha | Radionuclides | 15 pCi/L | 21 | 1 | Yes |
| Lead and Copper Rule | Treatment Technique | N/A | 17 | 1 | No |
| Gross Beta | Radionuclides | 50 pCi/L | 5 | 1 | Yes |
| Revised Total Coliform Rule | Microbiological | N/A | 4 | 1 | No |
| Stage 2 DBP Rule | Treatment Technique | N/A | 2 | 1 | Yes |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
Violation Trend Over Time
Year-by-year EPA violations recorded for water systems serving Pewaukee:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2024 | 6 | 6 |
| 2025 | 9 | 9 |
Violations have increased from 6 in 2024 to 9 in 2025. This trend warrants monitoring.
EPA Enforcement History
The EPA and state regulators have taken 10 enforcement actions against water systems serving Pewaukee. Recent actions:
| Date | Action Type |
|---|---|
| 2025-08-19 | State Filed Judgment |
| 2025-08-19 | State Informal Action |
| 2025-08-19 | State Filed Suit |
| 2025-07-31 | State Filed Suit |
| 2025-07-31 | State Informal Action |
| 2025-07-31 | State Filed Judgment |
| 2025-06-23 | State Informal Action |
| 2025-06-23 | State Order Extension |
| 2025-06-18 | State Informal Action |
| 2025-06-18 | State Filed Suit |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-08-19.
Pewaukee vs. Nearby Wisconsin Cities
How Pewaukee's water quality compares to similar cities in Wisconsin:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Pewaukee | D | 49 | 5 | 17,668 |
| Hudson | C | 8 | 2 | 17,785 |
| Onalaska | B | 0 | 1 | 18,000 |
| Kaukauna | B | 1 | 3 | 18,088 |
Common Questions About Pewaukee Water
These are the most common questions residents search for about water quality in Pewaukee, Wisconsin:
Is Pewaukee water hard or soft? Water hardness varies by source. Pewaukee's 5 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Pewaukee tap water? Pewaukee's water receives a grade of D (40/100). There are 27 health-based violations — consider filtration.
What is the best water filter for Pewaukee? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Pewaukee vs. Wisconsin Average
Understanding how Pewaukee compares to the broader Wisconsin average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below — water quality can vary significantly even within Pewaukee.
ZIP Codes in Pewaukee
Pewaukee spans 1 ZIP code. The ZIP with the lowest water quality score is 53072. Each ZIP code has its own water quality profile based on the specific water system serving that area. Check each ZIP code for detailed contaminant data, violation history, and system information.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Updated daily.