What's in MADISON WATER UTILITY's water?
MADISON WATER UTILITY had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. 272,000 people get their water from it, across 100,740 connections.
Ranked against every other system in this dataset
Out of 12,903 systems in this dataset, MADISON WATER UTILITY ranks 3,986th by violation burden (69th percentile) - 71 violations total, 4 health-baseds.
How MADISON WATER UTILITY compares within
's 244 covered systems average 11.2 health-based violations each; MADISON WATER UTILITY carries 4, not more than typical for the state. 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 MADISON WATER UTILITY is from 2025-05-10 (health-based: 2025-05-10). Last reported to EPA: 05/29/2026.
What kind of problem, specifically
MADISON WATER UTILITY'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:
- Lead & copper - flagged from: LEAD AND COPPER RULE REVISIONS; Lead and Copper Rule
The most severe category on record is lead & copper, which points toward a lead-class filter if you want to address it directly.
What this data is and is not
MADISON WATER UTILITY's numbers here come from its own required reporting to EPA under the Safe Drinking Water Act, not from an independent test of your glass of water. Between the utility's meter and MADISON WATER UTILITY's customers' taps is household plumbing, invisible to a system-level record ranked 3,986th of 12,903 by violation count. The guide to what this data misses covers that gap.