Union County, South Dakota — Flood Zone, Water Quality, Soil Foundation, Radon & EPA Hazards
In Union County, South Dakota, public U.S. EPA records track 70 regulated facilities (#19 of 109 in South Dakota), including 0 (0.0%) High-Risk sites and $0 in federal penalties. Countywide due diligence also covers 10 Safe Drinking Water (SDWIS) facilities, 51 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 01, 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 • BERESFORD, SD (ZIP 57004 Sector) | MODERATE (41/100) | Violation Identified (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • ELK POINT, SD (ZIP 57025 Sector) | MODERATE (33/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • ALCESTER, SD (ZIP 57001 Sector) | MODERATE (33/100) | Resolved / Historical Non-Compliance (4 qtrs NC) | 🔒 4 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • NORTH SIOUX CITY, SD (ZIP 57049 Sector) | MODERATE (31/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • , SD (ZIP Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (8 qtrs NC) | 🔒 8 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • NORTH SIOUX CITY, SD (ZIP 57049 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (4 qtrs NC) | 🔒 4 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • NORTH SIOUX CITY, SD (ZIP 57049 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (1 qtrs NC) | 🔒 1 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • ELK POINT, SD (ZIP 57025 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (1 qtrs NC) | 🔒 1 Qtrs Non-Compliance • Unlock → |
| LANAST LLC DBA ARCTIC ICE FREE PREVIEW (LOW RISK) | 605 N. DERBY LANE, NORTH SIOUX CITY, SD 57049 | LOW (19/100) | No Violation Identified (0 qtrs NC) | $0 |
| EMPIRICAL TECHNOLOGY FREE PREVIEW (LOW RISK) | 891 TWO RIVERS DRIVE, DAKOTA DUNES, SD 57049 | LOW (19/100) | No Violation Identified (0 qtrs NC) | $0 |
| DAKOTA DUNES COMMUNITY IMPROVE FREE PREVIEW (LOW RISK) | 335 SIOUX POINTE RD, DAKOTA DUNES, SD 57049 | LOW (18/100) | No Violation Identified (0 qtrs NC) | $0 |
| BERG'S AUTO MALL, INC. FREE PREVIEW (LOW RISK) | 1505 W CEDAR, BERESFORD, SD 57004 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — Union County, South Dakota Environmental Due Diligence
How many EPA-regulated environmental sites are in Union County, South Dakota?
Public U.S. EPA records track 70 regulated facilities in Union County, South Dakota (ranking #19 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 1 (1.4%) have active non-compliance quarters.
Which ZIP codes and cities in Union County have the highest regulated facility density?
Within Union County, the highest concentrations of EPA-tracked facilities are located in ZIP 57049 (North Sioux City, 56 sites), ZIP 57001 (Alcester, 13 sites), ZIP 57038 (Jefferson, 7 sites), spanning municipal corridors including North Sioux City (42 sites), Alcester (13 sites), Dakota Dunes (13 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Union County?
Across Union County, 35 facilities (50.0% 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, SD?
Geologic indoor air screening places Union 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, SD?
Federal records track 10 Safe Drinking Water (SDWIS) facilities, 51 Clean Water Act NPDES permits, and 22 impaired water dischargers in Union 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.