Lake Mills Waterworks
EPA ID: WI1280108 · 6,211 people served · 1 ZIP code
ZipCheckup's reading of EPA records for Lake Mills Waterworks (WI1280108): 1 health-based violation recorded since 2021. Although 1 violation appeared on Lake Mills Waterworks's record, each is listed as resolved; the system serves about 6,211 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Lake Mills Waterworks 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 Lake Mills Waterworks have a median household income of $89,841 and about 9,485 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 56% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Lake Mills Waterworks'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.
Infrastructure Risk
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
Lake Mills Waterworks (EPA ID: WI1280108) is a community water system in Wisconsin that serves approximately 6,211 people from groundwater sources.
This system serves ZIP code 53551 in Lake Mills.
ZIP-Area Home Safety Context: C (66/100)
This is the average Home Safety Score for 1 of 1 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
Status breakdown for accepted records with record years 2021-2026: 1 resolved, 0 archived, 0 addressed, and 0 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| September 17, 2022 | Lead and Copper Rule | Health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Lead and Copper Rule | Treatment Technique | 1 | Yes |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0046 mg/L | No | 2025-09-30 |
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
1 of 1 ZIP records with known zones is 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.
- 53551 - Lake Mills
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Lake Mills Waterworks (WI1280108) on EPA.gov.
Frequently Asked Questions
Is Lake Mills Waterworks water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Lake Mills Waterworks; its 1 accepted 2021-2026 record are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Lake Mills Waterworks serve?
Lake Mills Waterworks serves approximately 6,211 people across 1 ZIP code in Wisconsin.
Where does Lake Mills Waterworks 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.
- #38 / 50 Highest Exposure Burden (Wisconsin)
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Lake Mills Waterworks (WI): 1 Health Violation. https://zipcheckup.com/water-system/wi1280108/
@misc{zipcheckup-water-system-wi1280108,
author = {{ZipCheckup}},
title = {{Lake Mills Waterworks (WI): 1 Health Violation}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/wi1280108/}
}
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
Lake Mills Waterworks (EPA ID: WI1280108) - request the latest Consumer Confidence Report or ask about specific contaminants.