Sioux County, Iowa — Property Hazard, Flood Zone, Soil, Water & EPA Guide
What Are the Flood, Soil Foundation & EPA Risks in Sioux County, IA?
In Sioux County, Iowa, public U.S. EPA records track 324 regulated facilities (#11 of 117 in Iowa), including 6 (1.9%) High-Risk sites and $32,250 in federal penalties. Countywide due diligence also covers 14 Safe Drinking Water (SDWIS) facilities, 111 Clean Water NPDES permits, 1 FEMA Federal Disaster Declarations (1 flood/storm), USDA Soil Foundation Shrink-Swell (HIGH signal), and EPA Zone 1 — High Potential (> 4.0 pCi/L).
Sioux County, IA 6-in-1 Flood, Soil Foundation, Tap Water & Radon Signals
🔒 Parcel-Level Soil LEP %, Water Table Depth & Flood Zone Require Street Address Scan📊 Sioux County, IA Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 05, 2026)Municipalities in Sioux County
Top EPA Regulated Facilities in Sioux County, IA
100% of High-Risk & penalized facilities have facility names, street names, and dockets redacted (3 Low-Risk compliant records shown as Free Previews).
| Facility Name / Hazard Type | Sector Location (Street Redacted) | Risk Tier & Score | Compliance Status | Enforcement / Unlock |
|---|---|---|---|---|
| 🔒 Locked High-Risk EPA Enforcement Record #1 | 🔒 Exact Street & Parcel Redacted • SIOUX CENTER, IA (ZIP 51250 Sector) | HIGH (70/100) | Significant Violation (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • HULL, IA (ZIP 51239 Sector) | HIGH (67/100) | Significant Violation (9 qtrs NC) | 🔒 9 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • SIOUX CENTER, IA (ZIP 51250 Sector) | HIGH (64/100) | Significant Violation (11 qtrs NC) | 🔒 Federal Penalty on File • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • HULL, IA (ZIP 51239 Sector) | MODERATE (45/100) | Violation Identified (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • SIOUX CENTER, IA (ZIP 51250 Sector) | MODERATE (40/100) | Violation Identified (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • BOYDEN, IA (ZIP 51234 Sector) | MODERATE (38/100) | Violation Identified (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • SIOUX CENTER, IA (ZIP 51250 Sector) | MODERATE (33/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • SIOUX CENTER, IA (ZIP 51250 Sector) | MODERATE (33/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| ROCK INDUSTRIES INC FREE PREVIEW (LOW RISK) | 880 10TH STREET, ROCK VALLEY, IA 51247 | LOW (19/100) | No Violation Identified (0 qtrs NC) | $0 |
| HAWARDEN MACHINE INC FREE PREVIEW (LOW RISK) | 123 10TH STREET, HAWARDEN, IA 51023 | LOW (19/100) | No Violation Identified (0 qtrs NC) | $0 |
| COLORFX FREE PREVIEW (LOW RISK) | 1000 RAILROAD ST, BOYDEN, IA 51234 | LOW (19/100) | No Violation Identified (0 qtrs NC) | $0 |
| FARMERS ELEVATOR CO - ROCK VALLEY NH3 FREE PREVIEW (LOW RISK) | 1219 MAIN ST, ROCK VALLEY, IA 51247 | LOW (19/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — Sioux County, Iowa Environmental Due Diligence
How many EPA-regulated environmental sites are in Sioux County, Iowa?
Public U.S. EPA records track 324 regulated facilities in Sioux County, Iowa (ranking #11 of 117 jurisdictions in IA). Of those, 6 (1.9%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 13 (4.0%) have active non-compliance quarters.
Which ZIP codes and cities in Sioux County have the highest regulated facility density?
Within Sioux County, the highest concentrations of EPA-tracked facilities are located in ZIP 51250 (Sioux Center, 78 sites), ZIP 51247 (Rock Valley, 72 sites), ZIP 51041 (Orange City, 41 sites), spanning municipal corridors including Sioux Center (76 sites), Rock Valley (71 sites), Orange City (38 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Sioux County?
Across Sioux County, 105 facilities (32.4% of regulated sites) are registered Resource Conservation and Recovery Act (RCRA) hazardous waste generators or handlers, and 0 industrial sites report toxic chemical releases to the EPA Toxics Release Inventory (TRI).
What is the EPA Radon Zone classification for Sioux County, IA?
Geologic indoor air screening places Sioux County in EPA Zone 1 — High Potential (> 4.0 pCi/L). Counties in EPA Radon Zone 1 have a predicted average indoor radon screening level greater than 4.0 pCi/L (the EPA action threshold). Short-term or continuous indoor radon testing is strongly recommended prior to closing.
How many drinking water systems (SDWIS), impaired water bodies, and FEMA flood disasters are recorded in Sioux County, IA?
Federal records track 14 Safe Drinking Water (SDWIS) facilities, 111 Clean Water Act NPDES permits, and 12 impaired water dischargers in Sioux County, alongside 1 historical FEMA federal disaster declarations (1 flood/storm events).
Does Sioux County, IA have expansive clay soil or foundation risk?
USDA regional soil engineering screening for Sioux County indicates a HIGH shrink-swell risk signal and steel pipe corrosivity rated Moderate. Run a street address scan to unlock the exact parcel soil series, LEP %, and water table depth.