Middleton Waterworks, WI Water Quality
Middleton Waterworks: EPA violation history, explained
Middleton Waterworks had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. 23,868 people get their water from it, across 8,840 connections.
How this compares nationally
33 total violations and 3 health-based ones put Middleton Waterworks at the 62th percentile nationally for violation burden, rank 4,886 of 12,903.
How Middleton Waterworks compares within WI
WI's 259 covered systems average 5.4 health-based violations each; Middleton Waterworks carries 3, not more than typical for the state. See the lead and copper guide for why lead counts differently.
Most recent violation on record
The last violation EPA has on record for Middleton Waterworks is from 2025-05-10 (health-based: 2025-05-10). Last reported to EPA: 05/29/2026.
What kind of problem, specifically
Middleton 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
Middleton 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. Between the utility's meter and Middleton Waterworks's customers' taps is household plumbing, invisible to a system-level record ranked 4,886th of 12,903 by violation count. The guide to what this data misses covers that gap.