MASON CITY WATER DEPARTMENT: EPA violation history, explained
MASON CITY WATER DEPARTMENT has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 27,338 people through 19,000 service connections.
MASON CITY WATER DEPARTMENT's record against the rest of the country
Out of 12,903 systems in this dataset, MASON CITY WATER DEPARTMENT ranks 979th by violation burden (92th percentile) - 143 violations total, 18 health-baseds.
Against the IA average
IA's 203 covered systems average 3.5 health-based violations each; MASON CITY WATER DEPARTMENT carries 18, more than typical for the state. The clean-record guide covers what a comparison like this can hide.
Most recent violation on record
MASON CITY WATER DEPARTMENT's most recent violation on record is dated 2024-01-06, with the most recent health-based one dated 2012-01-08. Last reported to EPA: 06/17/2026.
The concern categories on record
MASON CITY WATER DEPARTMENT'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 MASON CITY WATER DEPARTMENT's record does not cover
Everything on this page is MASON CITY WATER DEPARTMENT's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. Between the utility's meter and MASON CITY WATER DEPARTMENT's customers' taps is household plumbing, invisible to a system-level record ranked 979th of 12,903 by violation count. The guide to what this data misses covers that gap.