Is JEFFERSON WATERWORKS's water safe to drink?
JEFFERSON WATERWORKS 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 7,926 people through 3,072 service connections.
How this compares nationally
JEFFERSON WATERWORKS has 18 violations on record in total, 12 of thems health-based - ranking it 1,640th of 12,903 systems by violation count, the 87th percentile nationally.
How JEFFERSON WATERWORKS compares within WI
WI's 202 covered systems average 3.6 health-based violations each; JEFFERSON WATERWORKS carries 12, more than typical for the state. The clean-record guide covers what a comparison like this can hide.
Most recent violation on record
The last violation EPA has on record for JEFFERSON WATERWORKS is from 2024-01-10 (health-based: 2024-01-04). Last reported to EPA: 05/29/2026.
What kind of problem, specifically
JEFFERSON 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:
- Lead & copper - flagged from: Lead and Copper Rule
- Microbial contamination / treatment technique - flagged from: Coliform (TCR)
- Radionuclides - flagged from: Combined Radium (-226 and -228); Gross Alpha, Excl. Radon and U
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
This is what JEFFERSON 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. Between the utility's meter and JEFFERSON WATERWORKS's customers' taps is household plumbing, invisible to a system-level record ranked 1,640th of 12,903 by violation count. The guide to what this data misses covers that gap.