Union County, South Dakota — Property Hazard, Flood Zone, Soil, Water & EPA Guide
What Are the Flood, Soil Foundation & EPA Risks in Union County, SD?
In Union County, South Dakota, public U.S. EPA records track 32 regulated facilities (#47 of 109 in South Dakota), including 0 (0.0%) High-Risk sites and $0 in federal penalties. Countywide due diligence also covers 0 Safe Drinking Water (SDWIS) facilities, 31 Clean Water NPDES permits, 1 FEMA Federal Disaster Declarations (1 flood/storm), USDA Soil Foundation Shrink-Swell (MODERATE signal), and EPA Zone 1 — High Potential (> 4.0 pCi/L).
Union County, SD 6-in-1 Flood, Soil Foundation, Tap Water & Radon Signals
🔒 Parcel-Level Soil LEP %, Water Table Depth & Flood Zone Require Street Address Scan📊 Union County, SD Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 03, 2026)Municipalities in Union County
ZIP Codes in Union County
Top EPA Regulated Facilities in Union County, SD
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 Regulated EPA Enforcement Record #1 | 🔒 Exact Street & Parcel Redacted • NORTH SIOUX CITY, SD (ZIP 57049 Sector) | MODERATE (30/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • NORTH SIOUX CITY, SD (ZIP 57049 Sector) | MODERATE (30/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • NORTH SIOUX CITY, SD (ZIP 57049 Sector) | MODERATE (30/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| FLYNN STREET MORTON BUILDING FREE PREVIEW (LOW RISK) | 507 S. FLYNN STREET, NORTH SIOUX CITY, SD 57049 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| MCCOOK LAKE REHABILITATION FREE PREVIEW (LOW RISK) | 29 NORTHSHORE DRIVE (MCCOOK LAKE), NORTH SIOUX CITY, SD 57049 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| RIVER VALLEY CONDOMINIUMS FREE PREVIEW (LOW RISK) | INTERSECTION OF SODRAC DR & BELMONT PARK AVE (NW C, NORTH SIOUX CITY, SD 57049 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| STREETER DRIVE REALIGNMENT FREE PREVIEW (LOW RISK) | 205 SODRAC DRIVE, NORTH SIOUX CITY, SD 57049 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • DAKOTA DUNES, SD (ZIP 57049 Sector) | LOW (17/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • JEFFERSON, SD (ZIP 57038 Sector) | LOW (17/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • DAKOTA DUNES, SD (ZIP 57049 Sector) | LOW (17/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • DAKOTA DUNES, SD (ZIP 57049 Sector) | LOW (17/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • DAKOTA DUNES, SD (ZIP 57049 Sector) | LOW (16/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
Frequently Asked Questions — Union County, South Dakota Environmental Due Diligence
How many EPA-regulated environmental sites are in Union County County, South Dakota?
Public U.S. EPA records track 32 regulated facilities in Union County County, South Dakota (ranking #47 of 109 jurisdictions in SD). 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 Union County County have the highest regulated facility density?
Within Union County County, the highest concentrations of EPA-tracked facilities are located in ZIP 57004 (Beresford, 43 sites), ZIP 57025 (Elk Point, 13 sites), spanning municipal corridors including Elk Point (14 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Union County County?
Across Union County County, 0 facilities (0.0% 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 Union County County, SD?
Geologic indoor air screening places Union 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 Union County County, SD?
Federal records track 0 Safe Drinking Water (SDWIS) facilities, 31 Clean Water Act NPDES permits, and 16 impaired water dischargers in Union County County, alongside 1 historical FEMA federal disaster declarations (1 flood/storm events).
Does Union County, SD have expansive clay soil or foundation risk?
USDA regional soil engineering screening for Union County indicates a MODERATE 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.