Deforest Waterworks

ZipCheckup's reading of EPA SDWIS for Deforest Waterworks (WI1130221): 1 unresolved EPA violation on record. In the current EPA monitoring period, Deforest Waterworks has 1 violation still listed as unresolved, with the utility supplying water to approximately 10,500 residents.

Data: EPA SDWIS

System Overview

Deforest Waterworks (EPA ID: WI1130221) is a community water system in Wisconsin that serves approximately 10,500 people from groundwater sources.

This system provides water to 4 ZIP codes across 4 communities.

ZIP-Area Home Safety Context: C (60/100)

This is the average Home Safety Score for 1 of 4 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 1 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

Contaminants Detected

The following contaminants have been flagged in EPA records for this water system:

Lead & Copper

EPA Lead and Copper Rule evidence attributed directly to this water system:

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

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.

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.

• 53532 - De Forest
• 53590 - Sun Prairie
• 53598 - Windsor
• 53718 - Madison

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Deforest Waterworks (WI1130221) on EPA.gov.

Frequently Asked Questions

Is Deforest Waterworks water safe to drink?

The accepted 2026Q2 ECHO snapshot shows 1 current noncompliance record and zero current records classified as health-based. That classification is not a property-specific water test or safety guarantee.

How many people does Deforest Waterworks serve?

Deforest Waterworks serves approximately 10,500 people across 4 ZIP codes in Wisconsin.

Where does Deforest Waterworks get its water?

The primary water source is groundwater.

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  author = {{ZipCheckup}},
  title  = {{Deforest Waterworks (WI): 1 Health Violation}},
  year   = {n.d.},
  url    = {https://zipcheckup.com/water-system/wi1130221/}
}