GREENDALE WATERWORKS: EPA violation history, explained

GREENDALE WATERWORKS has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 14,393, over 5,330 connections.

Ranked against every other system in this dataset

8 total violations and 1 health-based ones put GREENDALE WATERWORKS at the 35th percentile nationally for violation burden, rank 8,362 of 12,903.

Against the WI average

GREENDALE WATERWORKS's 1 health-based violations sit within the WI average of 3.6, across 202 systems statewide. The clean-record guide covers what a comparison like this can hide.

Most recent violation on record

GREENDALE WATERWORKS's most recent violation on record is dated 2023-01-10, with the most recent health-based one dated 2011-01-09. Last reported to EPA: 05/29/2026.

The concern categories on record

GREENDALE 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 GREENDALE WATERWORKS's record does not cover

This is what GREENDALE 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 - 1 health-based violation on file for GREENDALE 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.