Mayville Waterworks, WI Water Quality
What's in Mayville Waterworks's water?
Mayville Waterworks has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 5,112 people get their water from it, across 1,893 connections.
Mayville Waterworks's record against the rest of the country
12 total violations and 6 health-based ones put Mayville Waterworks at the 75th percentile nationally for violation burden, rank 3,224 of 12,903.
Against the WI average
Mayville Waterworks's 6 health-based violations sit above the WI average of 5.4, across 259 systems statewide. The clean-record guide covers what a comparison like this can hide.
Most recent violation on record
Mayville Waterworks's most recent violation on record is dated 2018-03-11, with the most recent health-based one dated 2010-01-07. Last reported to EPA: 05/29/2026.
The concern categories on record
Mayville 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)
- Radionuclides - flagged from: Combined Radium (-226 and -228)
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 Mayville Waterworks's record does not cover
This is what Mayville 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. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 12 logged violations can see. The guide to what this data misses covers that gap.