Sully County, South Dakota — Property Hazard, Flood Zone, Soil, Water & EPA Guide
What Are the Flood, Soil Foundation & EPA Risks in Sully County, SD?
In Sully County, South Dakota, public U.S. EPA records track 11 regulated facilities (#105 of 109 in South Dakota), including 0 (0.0%) High-Risk sites and $0 in federal penalties. Countywide due diligence also covers 1 Safe Drinking Water (SDWIS) facilities, 10 Clean Water NPDES permits, 15 FEMA Federal Disaster Declarations (8 flood/storm), USDA Soil Foundation Shrink-Swell (MODERATE signal), and EPA Zone 1 — High Potential (> 4.0 pCi/L).
Sully 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📊 Sully County, SD Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 05, 2026)Municipalities in Sully County
ZIP Codes in Sully County
Top EPA Regulated Facilities in Sully 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 • ONIDA, SD (ZIP 57564 Sector) | MODERATE (43/100) | Violation Identified (3 qtrs NC) | 🔒 3 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • ONIDA, SD (ZIP 57564 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (2 qtrs NC) | 🔒 2 Qtrs Non-Compliance • Unlock → |
| AGAR SCHOOL DISTRICT 58-1 FREE PREVIEW (LOW RISK) | 101 PINE STREET, AGAR, SD 57520 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| LAMB CHEVROLET & IMPLEMENT INC. FREE PREVIEW (LOW RISK) | 18500 US HIGHWAY 83, ONIDA, SD 57564 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| SEXAUER COMPANY FREE PREVIEW (LOW RISK) | NOT AVAILABLE, AGAR, SD 57520 | LOW (15/100) | No Violation Identified (0 qtrs NC) | $0 |
| ONIDA, CITY OF FREE PREVIEW (LOW RISK) | 106 S. MAIN ST., ONIDA, CITY OF, SD 57564 | LOW (12/100) | No Violation Identified (0 qtrs NC) | $0 |
| 🔒 Locked Regulated EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • AGAR, SD (ZIP 57520 Sector) | LOW (12/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • AGAR, SD (ZIP 57520 Sector) | LOW (11/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • PIERRE, SD (ZIP 57501 Sector) | LOW (11/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • , SD (ZIP Sector) | LOW (10/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • ONIDA, SD (ZIP 57564 Sector) | LOW (9/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
Frequently Asked Questions — Sully County, South Dakota Environmental Due Diligence
How many EPA-regulated environmental sites are in Sully County, South Dakota?
Public U.S. EPA records track 11 regulated facilities in Sully County, South Dakota (ranking #105 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 2 (18.2%) have active non-compliance quarters.
Which ZIP codes and cities in Sully County have the highest regulated facility density?
Within Sully County, the highest concentrations of EPA-tracked facilities are located in ZIP 57564 (Onida, 8 sites), ZIP 57520 (Agar, 5 sites), spanning municipal corridors including Onida (7 sites), Agar (5 sites), Onida, City Of (1 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Sully County?
Across Sully County, 3 facilities (27.3% 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 Sully County, SD?
Geologic indoor air screening places Sully 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 Sully County, SD?
Federal records track 1 Safe Drinking Water (SDWIS) facilities, 10 Clean Water Act NPDES permits, and 2 impaired water dischargers in Sully County, alongside 15 historical FEMA federal disaster declarations (8 flood/storm events).
Does Sully County, SD have expansive clay soil or foundation risk?
USDA regional soil engineering screening for Sully 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.