Janesville Water Utility
EPA ID: WI1540127 · 64,415 people served · 6 ZIP codes
ZipCheckup's reading of EPA records for Janesville Water Utility (WI1540127): no drinking-water violations recorded since 2021. Federal monitoring records show zero violations at Janesville Water Utility for the reporting cycles they cover, at a utility serving approximately 64,415 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Janesville Water Utility Source: EPA SDWIS service area boundaries.
Service area boundary - average Home Safety grade of mapped ZIPs: C
Demographics of ZIP Codes Served
The ZIP codes associated with Janesville Water Utility have a median household income of $73,430 and about 133,848 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 75% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Janesville Water Utility's water is classified in EPA records as a groundwater source. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Wastewater Proximity Note: This service area ranks in the 60th percentile nationally for proximity to wastewater discharge points.
Superfund Proximity Note: This service area ranks in the 80th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
PFAS in ZIP Codes This System Serves
PFAS ("forever chemicals") have been reported in samples from water systems associated with the ZIP codes in this system's area. These results can come from other water systems serving the same ZIP codes; check the UCMR5 section for any results reported for this system. 1 detection recorded.
Comparable Water Systems
Similar-sized systems in Wisconsin
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
Janesville Water Utility (EPA ID: WI1540127) is a community water system in Wisconsin that serves approximately 64,415 people from groundwater sources.
This system provides water to 6 ZIP codes across 4 communities.
ZIP-Area Home Safety Context: C (66/100)
This is the average Home Safety Score for 3 of 6 service-area ZIP codes with all required score domains observed. It is not a grade for the water utility.
Model 4.0.0 uses SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, the UCMR 5 PFAS MCL screen, EPA radon zone, and annual EPA AirData AQI across three equally weighted domains. Missing required evidence suppresses the score.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.01 mg/L | No | 2020-10-31 |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Radon Risk in Service Area
6 of 6 ZIP records with known zones are in EPA Radon Zone 1.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by WI or modeled from parcel and building-footprint data.
- 53501 - Afton
- 53511 - Beloit
- 53545 - Janesville
- 53546 - Janesville
- 53548 - Janesville
- 53563 - Milton
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Janesville Water Utility (WI1540127) on EPA.gov.
Frequently Asked Questions
Is Janesville Water Utility water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Janesville Water Utility in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does Janesville Water Utility serve?
Janesville Water Utility serves approximately 64,415 people across 6 ZIP codes in Wisconsin.
Where does Janesville Water Utility get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: No PFAS Reported Above Reporting Levels
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were reported above UCMR5 minimum reporting levels.
EPA's April 2024 PFAS rule sets MCLs of 4 ppt for PFOA and PFOS and 10 ppt for PFHxS, PFNA and HFPO-DA (GenX); water systems must comply from 2029. Other PFAS compounds have no individual federal MCL. A state standard is shown only where this system's state has its own enforceable PFAS limit. Detection results are EPA UCMR5 samples, not a measurement at your tap.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
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
How to cite this page
ZipCheckup. (n.d.). Janesville Water Utility, WI: Serves 64K People. https://zipcheckup.com/water-system/wi1540127/
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title = {{Janesville Water Utility, WI: Serves 64K People}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/wi1540127/}
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What You Can Do
Test your water
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Check your specific ZIP code
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Contact your utility
Janesville Water Utility (EPA ID: WI1540127) - request the latest Consumer Confidence Report or ask about specific contaminants.