OCONOMOWOC WATERWORKS: EPA violation history, explained

OCONOMOWOC WATERWORKS has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 15,805 people through 1 service connections.

OCONOMOWOC WATERWORKS's record against the rest of the country

9 total violations and 3 health-based ones put OCONOMOWOC WATERWORKS at the 59th percentile nationally for violation burden, rank 5,318 of 12,903.

Against the average

Among the 244 systems in this dataset, the average is 11.2 health-based violations - OCONOMOWOC WATERWORKS's 3 is at or below that. The clean-record guide covers what a comparison like this can hide.

Most recent violation on record

OCONOMOWOC WATERWORKS's most recent violation on record is dated 2014-01-01, with the most recent health-based one dated 2001-01-11. Last reported to EPA: 05/29/2026.

The concern categories on record

OCONOMOWOC 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 OCONOMOWOC WATERWORKS's record does not cover

This is what OCONOMOWOC 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 - 3 health-based violations on file for OCONOMOWOC 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.