WATERLOO: EPA violation history, explained
WATERLOO has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 10,190, over 4,942 connections.
WATERLOO's record against the rest of the country
39 total violations and 1 health-based ones put WATERLOO at the 42th percentile nationally for violation burden, rank 7,536 of 12,903.
How WATERLOO compares within IL
Among the 560 IL systems in this dataset, the average is 5.0 health-based violations - WATERLOO's 1 is at or below that. 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 is from 2025-01-04 (health-based: 1993-01-07). Last reported to EPA: 05/27/2026.
What kind of problem, specifically
WATERLOO'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: Surface Water Treatment Rule
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
WATERLOO'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. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 39 logged violations can see. The guide to what this data misses covers that gap.