Sioux County, North Dakota — Flood Zone, Water Quality, Soil Foundation, Radon & EPA Hazards
In Sioux County, North Dakota, public U.S. EPA records track 16 regulated facilities (#66 of 75 in North Dakota), including 0 (0.0%) High-Risk sites and $0 in federal penalties. Countywide due diligence also covers 0 Safe Drinking Water (SDWIS) facilities, 15 Clean Water NPDES permits, 2 FEMA Federal Disaster Declarations (2 flood/storm), USDA Soil Foundation Shrink-Swell (LOW signal), and EPA Zone 1 — High Potential (> 4.0 pCi/L).
Sioux County, ND 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, ND Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 01, 2026)Municipalities in Sioux County
ZIP Codes in Sioux County
Top EPA Regulated Facilities in Sioux County, ND
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 |
|---|---|---|---|---|
| PORCUPINE WALKING PATH FREE PREVIEW (LOW RISK) | BIA RTE 7, PORCUPINE, ND 58568 | LOW (18/100) | No Violation Identified (0 qtrs NC) | $0 |
| FORT YATES WATER TREATMENT PLANT FREE PREVIEW (LOW RISK) | 166 STANDING ROCK AVE, FORT YATES, ND 58538 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| SIOUX CO ND: RAISE GRANT CONST PROJ. BIA 6 & BIA 3 FREE PREVIEW (LOW RISK) | 85TH ST S, SELFRIDGE, ND 58568 | LOW (13/100) | No Violation Identified (0 qtrs NC) | $0 |
| CONSTRUCTION OF STANDING ROCK SEWER MAIN REPLACEMENTS FREE PREVIEW (LOW RISK) | 1ST AVE, CANNONBALL, ND 58528 | LOW (13/100) | No Violation Identified (0 qtrs NC) | $0 |
| 🔒 Locked Regulated EPA Enforcement Record #1 | 🔒 Exact Street & Parcel Redacted • FORT YATES, ND (ZIP 58538 Sector) | LOW (13/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • SELFRIDGE, ND (ZIP 58568 Sector) | LOW (13/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • FORT YATES, ND (ZIP 58538 Sector) | LOW (12/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • SOLEN, ND (ZIP 58570 Sector) | LOW (12/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • SELFRIDGE, ND (ZIP 58568 Sector) | LOW (12/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • FORT YATES, ND (ZIP 58538 Sector) | LOW (12/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • SELFRIDGE, ND (ZIP 58568 Sector) | LOW (12/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • STANDING ROCK, ND (ZIP 58538 Sector) | LOW (11/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
Frequently Asked Questions — Sioux County, North Dakota Environmental Due Diligence
How many EPA-regulated environmental sites are in Sioux County County, North Dakota?
Public U.S. EPA records track 16 regulated facilities in Sioux County County, North Dakota (ranking #66 of 75 jurisdictions in ND). Of those, 0 (0.0%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 0 (0.0%) have active non-compliance quarters.
Which ZIP codes and cities in Sioux County County have the highest regulated facility density?
Within Sioux County County, the highest concentrations of EPA-tracked facilities are located in ZIP 58538 (Fort Yates, 24 sites), spanning municipal corridors including Fort Yates (22 sites), Porcupine (2 sites), Standing Rock (1 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Sioux County County?
Across Sioux County County, 1 facilities (6.2% 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 County, ND?
Geologic indoor air screening places Sioux County 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 County, ND?
Federal records track 0 Safe Drinking Water (SDWIS) facilities, 15 Clean Water Act NPDES permits, and 1 impaired water dischargers in Sioux County County, alongside 2 historical FEMA federal disaster declarations (2 flood/storm events).
Does Sioux County, ND have expansive clay soil or foundation risk?
USDA regional soil engineering screening for Sioux County indicates a LOW 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.