Waukesha Water Utility
EPA ID: WI2680238 · 70,718 people served · 7 ZIP codes
Looking at the EPA enforcement file for Waukesha Water Utility, 8 violations are listed as unresolved — those findings cover the utility's service area of approximately 70,718 people and remain open in the federal compliance system, awaiting formal corrective action documentation.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Stable · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 1 (2021) to 26 (2025). Violation counts have remained relatively steady.
Service Area Map
Coverage area for Waukesha Water Utility Source: EPA SDWIS service area boundaries.
Service area boundary — Grade D
Service Area Demographics
The Waukesha Water Utility serves a community with a median household income of $96,725 and an estimated 131,234 residents across its service area. Approximately 59% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Waukesha Water Utility's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
About 1% of homes in Waukesha County, Wisconsin rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Superfund Proximity Note: This service area ranks in the 70th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
Detected Contaminants
How Waukesha Water Utility compares to EPA limits
What This Means For You
Contaminant 1006 at 1 mg/L exceeds the EPA maximum of 0.006 mg/L. Cholesterol & blood sugar effects, liver damage. Consider reverse osmosis filtration.
Haloacetic Acids (HAA5) at 1 mg/L exceeds the EPA maximum of 0.06 mg/L. Cancer risk; reproductive & developmental effects. Consider granular activated carbon (GAC) filtration.
Gross Alpha at 8 pCi/L exceeds the EPA maximum of pCi/L. Increased cancer risk from radioactive particles. Consider reverse osmosis filtration.
Lead and Copper Rule at 6 mg/L exceeds the EPA maximum of mg/L.
Stage 1 DBP Rule at 2 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 40 detections recorded. 12 exceed federal EPA limits (4 ppt for PFOA/PFOS).
Contaminant 1006 was detected in this water system. reverse osmosis filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
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Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Waukesha Water Utility (EPA ID: WI2680238) is a community water system in Wisconsin that serves approximately 70,718 people from surface water sources.
This system provides water to 7 ZIP codes across 4 communities.
Average Home Safety Score: D (41/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| July 1, 2025 | Surface Water Treatment Rule | Monitoring | Resolved |
| October 1, 2024 | Contaminant 1006 | Monitoring | Unresolved |
| June 1, 2024 | Stage 1 DBP Rule | Monitoring | Resolved |
| October 1, 2023 | Gross Beta | Health-based | Resolved |
| October 1, 2023 | Haloacetic Acids (HAA5) | Monitoring | Unresolved |
| September 29, 2023 | Lead and Copper Rule | Monitoring | Unresolved |
| September 20, 2023 | Lead and Copper Rule | Monitoring | Resolved |
| July 1, 2023 | Gross Beta | Health-based | Resolved |
| June 1, 2023 | Stage 1 DBP Rule | Monitoring | Unresolved |
| April 1, 2023 | Gross Beta | Health-based | Resolved |
| March 6, 2023 | Lead and Copper Rule | Monitoring | Resolved |
| January 1, 2023 | Gross Beta | Health-based | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Gross Alpha | Radionuclides | 8 | Yes |
| Lead and Copper Rule | Treatment Failure | 6 | No |
| Gross Beta | Radionuclides | 4 | Yes |
| Stage 1 DBP Rule | Treatment Failure | 2 | No |
| Contaminant 1006 | Other Violation | 1 | No |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 1 | No |
| Surface Water Treatment Rule | Treatment Failure | 1 | No |
Health Risk Details
Gross Alpha Particle Activity (EPA limit: pCi/L)
Increased cancer risk from radioactive particles At-risk groups: long-term residents in areas with uranium or radium-rich geology, people on private wells in western US.
Removal methods: reverse osmosis, ion exchange (anion exchange for radium), lime softening. Find the right filter →
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 53186 | 0.0023 mg/L | No | N/A |
| 53187 | 0.0023 mg/L | No | N/A |
| 53188 | 0.0023 mg/L | No | N/A |
| 53189 | 0.0023 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 1 (High Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: 6 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 1 additional ZIP inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
- 53072 — Pewaukee
- 53146 — New Berlin
- 53183 — Wales
- 53186 — Waukesha
- 53187 — Waukesha
- 53188 — Waukesha
- 53189 — Waukesha
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Waukesha Water Utility (WI2680238) on EPA.gov.
Frequently Asked Questions
Is Waukesha Water Utility water safe to drink?
Waukesha Water Utility has recorded 12 health-based violations in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does Waukesha Water Utility serve?
Waukesha Water Utility serves approximately 70,718 people across 7 ZIP codes in Wisconsin.
Where does Waukesha Water Utility get its water?
The primary water source is surface water.
Contact Your Water Utility
Public-record contact information for the water utility serving this system. Use these channels to request water quality reports, ask about service, or report issues directly.
Contact information from Waukesha Water Utility Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility, does not act as its agent, and does not provide customer support for it. Contact details shown are public-record information from CCR filings. For service issues, contact the utility directly using the information above.
Water Source & Treatment
Where this water originates and how it's treated before reaching your tap.
Source: Waukesha Water Utility Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility. Treatment and source data are sourced from the utility's published CCR filings.
In October 2023, Waukesha Water Utility transitioned from groundwater to 100% Lake Michigan water piped from Milwaukee Water Works. Treated water (~100%) is returned to Lake Michigan via Root River tributary. Prior groundwater came from sandstone aquifer with naturally elevated radium levels.
Treatment regime
How this utility classifies its treatment process and what each reported treatment chemical does.
Treatment chemicals and what each one does
Chemical names are reported verbatim by the utility. Purpose categories are ZipCheckup annotations based on standard drinking-water treatment practice.
Watershed exposure sources reported
Land-use and natural conditions identified in the utility's source-water assessment as potential contamination sources upstream of treatment.
Treatment classification and chemical list sourced from Waukesha Water Utility Consumer Confidence Report.
Treatment intensity is a ZipCheckup-derived classification based on the chemicals and processes the utility reports. Chemicals and contamination sources are taken verbatim from the utility's CCR filing. Routine federal monitoring and contaminant testing shown elsewhere on this page determine whether the water meets safety standards, not the treatment classification.
Federal UCMR5 PFAS Monitoring: Tested Clean
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were detected.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
PFAS Substances Detected in This System
This water system's Consumer Confidence Report disclosed the following PFAS compounds. Levels are from the utility's most recent reporting cycle.
In April 2024, EPA finalized the first National Primary Drinking Water Regulation for six PFAS. Public water systems have until 2029 to comply. EPA — PFAS regulation overview →
Source: Consumer Confidence Report disclosed by Waukesha Water Utility.
ZipCheckup is not affiliated with this water utility. PFAS detection data is sourced from public Consumer Confidence Reports filed by the utility itself.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
Notable events and violations
This section summarizes events the utility chose to disclose in its most recent Consumer Confidence Report, plus any federal compliance violations the utility recorded against itself. Both lists are utility-authored — ZipCheckup does not audit, judge, or reorder them.
Notable events from the utility's CCR
These bullet entries are the utility's own narration of operational, regulatory, or infrastructure events during the reporting period.
- In October 2023, Waukesha Water Utility transitioned from groundwater supply to 100% Lake Michigan water piped from Milwaukee Water Works. All back-page sample data reflects pre-October 2023 groundwater testing.
- In June 2016, the Great Lakes Compact unanimously approved Waukesha's application to borrow water from Lake Michigan. Treated return water flows via Root River tributary back to Lake Michigan.
ZipCheckup note: items above reflect what the utility published in its most recent CCR. Federal violation records are also tracked separately by the EPA Safe Drinking Water Information System (SDWIS) — the SDWIS record is the authoritative federal source for any specific regulatory action.
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Waukesha Water Utility (EPA ID: WI2680238) — request the latest Consumer Confidence Report or ask about specific contaminants.