What's in HORICON WATERWORKS's water?
HORICON WATERWORKS had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. 3,682 people get their water from it, across 1,363 connections.
How this compares nationally
15 total violations and 9 health-based ones put HORICON WATERWORKS at the 83th percentile nationally for violation burden, rank 2,233 of 12,903.
How HORICON WATERWORKS compares within WI
HORICON WATERWORKS's 9 health-based violations sit above the WI average of 3.6, across 202 systems statewide. The filter guide explains what a violation like this actually calls for.
Most recent violation on record
The last violation EPA has on record for HORICON WATERWORKS is from 2023-01-01 (health-based: 2023-01-01). Last reported to EPA: 05/29/2026.
What kind of problem, specifically
HORICON 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:
- Microbial contamination / treatment technique - flagged from: Coliform (TCR); Groundwater Rule
The most severe category on record is microbial contamination / treatment technique, which points toward a microbial-class filter if you want to address it directly.
What this data is and is not
Everything on this page is HORICON WATERWORKS's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 15 logged violations can see. The guide to what this data misses covers that gap.