PFAS in Sioux City, IA Drinking Water
PFAS data for Sioux City, Iowa · 89,537 residents · 9 ZIP codes
ZipCheckup's reading of PFAS in Sioux City, Iowa: the highest detected level is 8.6 ppt; the EPA limit is 4 ppt (PFOA/PFOS individually). PFAS carries a high health-risk designation.
In Sioux City, Iowa, PFAS has been detected in the public water supply - a contaminant that health agencies track because of documented effects associated with prolonged exposure at elevated concentrations.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-07-13
PFAS in Sioux City Tap Water
PFAS has been detected in Sioux City, Iowa drinking water at a maximum level of 8.6 detections — relative to the EPA MCL of 4 ppt (PFOA/PFOS individually).
This analysis covers 89,537 residents across 9 ZIP codes in Sioux City.
Sioux City's overall water quality grade is C (66/100).
Is PFAS in Sioux City Water Safe?
If you live in an affected ZIP code, consider installing a reverse osmosis or granular activated carbon filter certified under NSF 53 / NSF 58 and testing your water independently.
PFAS Levels by ZIP Code
| ZIP Code | PFAS Level | EPA Limit | Status |
|---|---|---|---|
| 51101 | 31 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 51102 | 31 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 51103 | 31 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 51104 | 31 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 51105 | 31 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 51106 | 31 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 51108 | 31 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 51111 | 31 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 51101 | 8.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 51102 | 8.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 51103 | 8.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 51104 | 8.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 51105 | 8.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 51106 | 8.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 51108 | 8.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 51109 | 8.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 51111 | 8.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 51101 | 4.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 51102 | 4.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 51103 | 4.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 51104 | 4.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 51105 | 4.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 51106 | 4.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 51108 | 4.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| 51109 | 4.6 ng/L | 4 ppt (PFOA/PFOS individually) | Exceeds limit |
| ...1 more ZIP codes |
Average pfas level across Sioux City: 14.11 ppt
Health Effects of PFAS
- Increased risk of kidney and testicular cancer
- Thyroid disease and immune system suppression
- Reproductive problems and reduced fertility
- Elevated cholesterol and liver effects
- Developmental effects in infants and children
Health risk severity: High. Governed by the PFAS National Primary Drinking Water Regulation (2024).
How PFAS Gets Into Drinking Water
- Firefighting foam (AFFF) used at military bases and airports
- Industrial manufacturing (non-stick coatings, stain-resistant fabrics)
- Wastewater treatment plants that receive industrial discharge
- Landfill leachate from PFAS-containing consumer products
What to Do About PFAS in Sioux City Water
- Install a reverse osmosis system (most effective — removes 90%+ of PFAS)
- Granular activated carbon (GAC) filters remove some PFAS compounds
- Look for NSF 53 or NSF 58 certification specifically tested for PFAS
- Pitcher filters with activated carbon provide partial reduction
Look for filters certified under NSF 53 / NSF 58 for pfas removal.