What's in WATERLOO WATER WORKS's water?
WATERLOO WATER WORKS has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 69,504 people through 27,430 service connections.
Ranked against every other system in this dataset
23 total violations and 3 health-based ones put WATERLOO WATER WORKS at the 61th percentile nationally for violation burden, rank 4,988 of 12,903.
How WATERLOO WATER WORKS compares within IA
IA's 203 covered systems average 3.5 health-based violations each; WATERLOO WATER WORKS carries 3, not more than typical for the state. See the lead and copper guide for why lead counts differently.
Most recent violation on record
The last violation EPA has on record for WATERLOO WATER WORKS is from 2015-01-11 (health-based: 2015-01-11). Last reported to EPA: 06/17/2026.
What kind of problem, specifically
WATERLOO WATER WORKS'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)
- Nitrate / nitrite - flagged from: Nitrate
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
Everything on this page is WATERLOO WATER WORKS'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 WATERLOO WATER WORKS's customers' taps is household plumbing, invisible to a system-level record ranked 4,988th of 12,903 by violation count. The guide to what this data misses covers that gap.