SIOUX CITY WATER SUPPLY
PWSID: IA9778054 · Sioux City, IA · Serves 85,791 people
SIOUX CITY WATER SUPPLY has 10 health-based violations out of 10 total. Health violations indicate contaminant levels exceeded EPA limits or required treatment was not followed.
SIOUX CITY WATER SUPPLY (PWSID IA9778054) is a cws water system drawing from a surface water source, regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act. It serves approximately 85,791 people in Sioux City, IA, and is subject to primacy enforcement by the Iowa drinking-water program.
The system's federal compliance record contains 10 total violations, with 10 classified as health-based (MCL exceedances or treatment-technique failures). 2 distinct contaminants have been cited, including Contaminant 2257, Total Trihalomethanes (TTHM). Recorded violations span 2016–2019.
A historical violation does not necessarily describe current water quality, systems must notify customers and remediate, and monitoring-type violations often reflect reporting lapses rather than contamination. The most authoritative real-time source is the utility's annual Consumer Confidence Report. For enforcement history and corrective-action orders, consult EPA ECHO and the Iowa state drinking-water program's public portal.
System Details
- EPA ID (PWSID)
- IA9778054
- System Type
- CWS
- Water Source
- Surface Water
- Location
- Sioux City, IA
- Population Served
- 85,791
- Health Violations
- Yes (10)
What contaminants are in this water system?
| Contaminant | Violations | Health-Based |
|---|---|---|
| Contaminant 2257 | 6 | 6 |
| Total Trihalomethanes (TTHM) | 4 | 4 |
Violation History (10)
| Contaminant | Health | Date |
|---|---|---|
| Total Trihalomethanes (TTHM) | Yes | Oct 1, 2019 |
| Total Trihalomethanes (TTHM) | Yes | Oct 1, 2019 |
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2019 |
| Total Trihalomethanes (TTHM) | Yes | Jul 1, 2019 |
| Contaminant 2257 | Yes | Mar 6, 2017 |
| Contaminant 2257 | Yes | Mar 6, 2017 |
| Contaminant 2257 | Yes | Nov 25, 2016 |
| Contaminant 2257 | Yes | Nov 25, 2016 |
| Contaminant 2257 | Yes | May 19, 2016 |
| Contaminant 2257 | Yes | May 19, 2016 |
Frequently Asked Questions
Is SIOUX CITY WATER SUPPLY water safe to drink?
How many people does SIOUX CITY WATER SUPPLY serve?
What violations does SIOUX CITY WATER SUPPLY have?
What contaminants have been found in SIOUX CITY WATER SUPPLY water?
Nearby Water Systems
Explore More
About This Data
Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Violation records may span multiple years.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.