MADISON: EPA violation history, explained

MADISON has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 6,191, over 2,687 connections.

MADISON's record against the rest of the country

35 total violations and 9 health-based ones put MADISON at the 83th percentile nationally for violation burden, rank 2,131 of 12,903.

How MADISON compares within SD

SD's 74 covered systems average 3.0 health-based violations each; MADISON carries 9, 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 MADISON is from 2014-03-04 (health-based: 2013-01-01). Last reported to EPA: 06/17/2026.

What kind of problem, specifically

MADISON'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:

• Disinfection byproducts - flagged from: TTHM

The most severe category on record is disinfection byproducts, which points toward a carbon-class filter if you want to address it directly.

What this data is and is not

This is what MADISON 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 - 9 health-based violations on file for MADISON - 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.