Is CRESTON WATER SUPPLY's water safe to drink?
CRESTON WATER SUPPLY has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 7,536 people get their water from it, across 3,300 connections.
Ranked against every other system in this dataset
CRESTON WATER SUPPLY has 15 violations on record in total, 5 of thems health-based - ranking it 3,650th of 12,903 systems by violation count, the 72th percentile nationally.
How CRESTON WATER SUPPLY compares within IA
IA's 203 covered systems average 3.5 health-based violations each; CRESTON WATER SUPPLY carries 5, 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 CRESTON WATER SUPPLY is from 2019-01-07 (health-based: 2018-11-06). Last reported to EPA: 06/17/2026.
What kind of problem, specifically
CRESTON WATER SUPPLY'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: Interim Enhanced Surface Water Treatment Rule
- Synthetic organic chemicals / pesticides / VOCs - flagged from: Epichlorohydrin
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
CRESTON WATER SUPPLY'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 CRESTON WATER SUPPLY's customers' taps is household plumbing, invisible to a system-level record ranked 3,650th of 12,903 by violation count. The guide to what this data misses covers that gap.