Colby Waterworks
EPA ID: WI7370169 · 1,829 people served · 4 ZIP codes
ZipCheckup's reading of EPA records for Colby Waterworks (WI7370169): no drinking-water violations recorded since 2021. Zero violations are listed in EPA monitoring data for Colby Waterworks; a count of records like this is not a water-quality test for the 1,829 residents it serves.
Data: EPA SDWIS
Service Area Map
Coverage area for Colby Waterworks Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Colby Waterworks have a median household income of $63,465 and about 9,733 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 66% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: On average, 43% of census tracts in the counties mapped to this service area are designated disadvantaged by the federal Climate and Economic Justice Screening Tool (CEJST, 2022 version). Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
💧 Where Does Your Water Come From?
Colby 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
Colby Waterworks (EPA ID: WI7370169) is a community water system in Wisconsin that serves approximately 1,829 people from groundwater sources.
This system provides water to 4 ZIP codes across 4 communities.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0009 mg/L | No | 2023-09-30 |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
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: Ask your water utility whether running cold water for 2 minutes is enough to flush your plumbing before drinking.
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.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Colby Waterworks (WI7370169) on EPA.gov.
Frequently Asked Questions
Is Colby Waterworks water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Colby Waterworks 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 Colby Waterworks serve?
Colby Waterworks serves approximately 1,829 people across 4 ZIP codes in Wisconsin.
Where does Colby Waterworks get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Colby Waterworks Water Quality Report, WI. https://zipcheckup.com/water-system/wi7370169/
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title = {{Colby Waterworks Water Quality Report, WI}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/wi7370169/}
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