DEERFIELD WATERWORKS: EPA violation history, explained

DEERFIELD WATERWORKS has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 2,510 people get their water from it, across 929 connections.

Ranked against every other system in this dataset

DEERFIELD WATERWORKS has 11 violations on record in total, 7 of thems health-based - ranking it 2,846th of 12,903 systems by violation count, the 78th percentile nationally.

How DEERFIELD WATERWORKS compares within WI

Among the 202 WI systems in this dataset, the average is 3.6 health-based violations - DEERFIELD WATERWORKS's 7 is above that. See the lead and copper guide for why lead counts differently.

Most recent violation on record

The last violation EPA has on record for DEERFIELD WATERWORKS is from 2012-01-10 (health-based: 1998-01-08). Last reported to EPA: 05/29/2026.

What kind of problem, specifically

DEERFIELD 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)

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

This is what DEERFIELD WATERWORKS reported to its state primacy agency and EPA under the Safe Drinking Water Act - real regulatory record, not a lab test of your specific tap. This record - 7 health-based violations on file for DEERFIELD 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.