Is SIOUX CITY WATER SUPPLY's water safe to drink?
SIOUX CITY WATER SUPPLY has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 85,791, over 29,424 connections.
How this compares nationally
SIOUX CITY WATER SUPPLY has 35 violations on record in total, 14 of thems health-based - ranking it 1,354th of 12,903 systems by violation count, the 90th percentile nationally.
How SIOUX CITY WATER SUPPLY compares within IA
Among the 203 IA systems in this dataset, the average is 3.5 health-based violations - SIOUX CITY WATER SUPPLY's 14 is above that. 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 SIOUX CITY WATER SUPPLY is from 2024-01-05 (health-based: 2019-01-10). Last reported to EPA: 06/17/2026.
What kind of problem, specifically
SIOUX CITY 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: Coliform (TCR); Interim Enhanced Surface Water Treatment Rule; Surface Water Treatment Rule
- Radionuclides - flagged from: Combined Radium (-226 and -228)
- Synthetic organic chemicals / pesticides / VOCs - flagged from: Epichlorohydrin
- Disinfection byproducts - flagged from: TTHM
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
This is what SIOUX CITY WATER SUPPLY 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. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 35 logged violations can see. The guide to what this data misses covers that gap.