Dewey County, South Dakota — Flood Zone, Water Quality, Soil Foundation, Radon & EPA Hazards
In Dewey County, South Dakota, public U.S. EPA records track 39 regulated facilities (#39 of 109 in South Dakota), including 1 (2.6%) High-Risk sites and $4,454 in federal penalties. Countywide due diligence also covers 5 Safe Drinking Water (SDWIS) facilities, 33 Clean Water NPDES permits, 15 FEMA Federal Disaster Declarations (8 flood/storm), USDA Soil Foundation Shrink-Swell (HIGH signal), and EPA Zone 1 — High Potential (> 4.0 pCi/L).
Dewey 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📊 Dewey County, SD Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 01, 2026)Municipalities in Dewey County
ZIP Codes in Dewey County
Top EPA Regulated Facilities in Dewey 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 High-Risk EPA Enforcement Record #1 | 🔒 Exact Street & Parcel Redacted • TIMBER LAKE, SD (ZIP 57656 Sector) | HIGH (64/100) | Significant Violation (6 qtrs NC) | 🔒 6 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • EAGLE BUTTE, SD (ZIP 57625 Sector) | MODERATE (30/100) | No Violation Identified (0 qtrs NC) | 🔒 Federal Penalty on File • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • EAGLE BUTTE, SD (ZIP 57625 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (7 qtrs NC) | 🔒 7 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • ISABEL, SD (ZIP 57633 Sector) | MODERATE (30/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • ISABEL, SD (ZIP 57633 Sector) | MODERATE (30/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • TIMBER LAKE, SD (ZIP 57656 Sector) | MODERATE (30/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| BIA - CHEYENNE RIVER AGENCY FREE PREVIEW (LOW RISK) | LAND OPS SHOP - BLDG #2010, EAGLE BUTTE, SD 57625 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| L & L BODY SHOP FREE PREVIEW (LOW RISK) | MAIN STREET, ISABEL, SD 57633 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| TED'S SERVICE FREE PREVIEW (LOW RISK) | 26436 US HWY 212, RIDGEVIEW, SD 57652 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| OCTAFLEX ENVIRONMENTAL SYSTEMS, INC. FREE PREVIEW (LOW RISK) | 707 E STREET, TIMBER LAKE, SD 57656 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • EAGLE BUTTE, SD (ZIP 57625 Sector) | LOW (15/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • EAGLE BUTTE, SD (ZIP 57625 Sector) | LOW (13/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
Frequently Asked Questions — Dewey County, South Dakota Environmental Due Diligence
How many EPA-regulated environmental sites are in Dewey County, South Dakota?
Public U.S. EPA records track 39 regulated facilities in Dewey County, South Dakota (ranking #39 of 109 jurisdictions in SD). Of those, 1 (2.6%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 1 (2.6%) have active non-compliance quarters.
Which ZIP codes and cities in Dewey County have the highest regulated facility density?
Within Dewey County, the highest concentrations of EPA-tracked facilities are located in ZIP 57625 (Eagle Butte, 39 sites), ZIP 57652 (Ridgeview, 5 sites), ZIP 57636 (Lantry, 2 sites), spanning municipal corridors including Lantry (2 sites), Glencross (1 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Dewey County?
Across Dewey County, 5 facilities (12.8% 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 Dewey County, SD?
Geologic indoor air screening places Dewey 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 Dewey County, SD?
Federal records track 5 Safe Drinking Water (SDWIS) facilities, 33 Clean Water Act NPDES permits, and 5 impaired water dischargers in Dewey County, alongside 15 historical FEMA federal disaster declarations (8 flood/storm events).
Does Dewey County, SD have expansive clay soil or foundation risk?
USDA regional soil engineering screening for Dewey County indicates a HIGH shrink-swell risk signal and steel pipe corrosivity rated High. Run a street address scan to unlock the exact parcel soil series, LEP %, and water table depth.