Sun Prairie Utilities, WI Water Quality
What's in Sun Prairie Utilities's water?
Sun Prairie Utilities had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. It serves 39,300 people through 14,555 service connections.
How this compares nationally
Out of 12,903 systems in this dataset, Sun Prairie Utilities ranks 6,139th by violation burden (52th percentile) - 25 violations total, 2 health-based.
How Sun Prairie Utilities compares within WI
Among the 259 WI systems in this dataset, the average is 5.4 health-based violations - Sun Prairie Utilities's 2 is at or below that. 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 Sun Prairie Utilities is from 2023-01-01 (health-based: 2023-01-01). Last reported to EPA: 05/29/2026.
What kind of problem, specifically
Sun Prairie Utilities'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)
- Other regulated metals - flagged from: Fluoride
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 this data is and is not
Sun Prairie Utilities'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 Sun Prairie Utilities's customers' taps is household plumbing, invisible to a system-level record ranked 6,139th of 12,903 by violation count. The guide to what this data misses covers that gap.