Deforest Waterworks, WI Water Quality
Is Deforest Waterworks's water safe to drink?
Deforest Waterworks had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. Population served: 10,500, over 3,888 connections.
Deforest Waterworks's record against the rest of the country
Deforest Waterworks has 7 violations on record in total, 4 of them health-based - ranking it 4,502th of 12,903 systems by violation count, the 65th percentile nationally.
How Deforest Waterworks compares within WI
Deforest Waterworks's 4 health-based violations sit within the WI average of 5.4, across 259 systems statewide. See the lead and copper guide for why lead counts differently.
Most recent violation on record
The last violation EPA has on record for Deforest Waterworks is from 2025-05-10 (health-based: 2025-05-10). Last reported to EPA: 05/29/2026.
What kind of problem, specifically
Deforest Waterworks's flagged contaminants and rule violations, grouped by what they actually mean for a filter choice rather than left as EPA's raw code list:
- Lead & copper - flagged from: Lead and Copper Rule Revisions
- Microbial contamination / treatment technique - flagged from: Coliform (TCR)
The most severe category on record is lead & copper, which points toward a lead-class filter if you want to address it directly.
What this data is and is not
Deforest Waterworks's numbers here come from its own required reporting to EPA under the Safe Drinking Water Act, not from an independent test of your glass of water. This record - 4 health-based violations on file for Deforest Waterworks - stops at the meter and cannot see household plumbing on the other side of it. The guide to what this data misses covers that gap.