ZIP 57656 (Timber Lake, SD) — Flood Zone, Water Quality, Soil Foundation, Radon & EPA Hazards
ZIP code 57656 in Timber Lake, South Dakota (Dewey County) has 12 EPA-tracked facilities, including 1 High-Risk sites (8.3%), 1 active violators, and $2,445 in federal penalties. Beyond industrial pollution, properties in ZIP 57656 are screened across 15 historical Dewey County FEMA disasters, USDA Soil Foundation Shrink-Swell (HIGH signal), Tap Water & Watershed Permits (8), and EPA Zone 1 — High Potential (> 4.0 pCi/L).
ZIP 57656 (Timber Lake, SD) 6-in-1 Flood, Soil Foundation, Tap Water & Radon Signals
🔒 Parcel-Level Soil LEP %, Water Table Depth & Flood Zone Require Street Address Scan📊 ZIP 57656 (Timber Lake, SD) Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 01, 2026)ZIP 57656 Sector Screening Map (High-Risk Pin Coordinates Locked)
Exact street pins for 1 High-Risk and 1 Active Violation sites are redacted on public directory maps.
Regulated EPA Facilities in ZIP 57656 (Timber Lake, 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 Score (0–100) | 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 • TIMBER LAKE, SD (ZIP 57656 Sector) | MODERATE (30/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • TIMBER LAKE, SD (ZIP 57656 Sector) | MODERATE (30/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 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 |
| SANITARY SEWER SYSTEM IMPROVEMENTS FREE PREVIEW (LOW RISK) | TIMBER LAKE, SD, TIMBER LAKE, SD 57656 | LOW (12/100) | No Violation Identified (0 qtrs NC) | $0 |
| WATER SYSTEM IMPROVEMENTS FREE PREVIEW (LOW RISK) | 700 MAIN ST, TIMBER LAKE, SD 57656 | LOW (12/100) | No Violation Identified (0 qtrs NC) | $0 |
| MNI WW SUPPLY N HWY 63 TREATED WATER PIPELINE PH 2 FREE PREVIEW (LOW RISK) | ALONG UTILITY ROW ALONG N HWY 63 & HWY 20 DEWEY CO, EAGLE BUTTE, SD 57656 | LOW (12/100) | No Violation Identified (0 qtrs NC) | $0 |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • TIMBER LAKE, SD (ZIP 57656 Sector) | LOW (12/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • TIMBER LAKE, SD (ZIP 57656 Sector) | LOW (12/100) | 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) | LOW (8/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
Frequently Asked Questions — ZIP 57656 (Timber Lake, SD) EPA Dataset & Radon
DATASET: U.S. EPA ECHO • FRS • RCRAInfo • TRI (November 01, 2026)How many EPA-tracked environmental sites are in ZIP code 57656 (Timber Lake, SD)?
ZIP code 57656 (Timber Lake, SD) contains 12 EPA-tracked facilities, of which 1 (8.3%) are classified in the High-Risk tier, 1 (8.3%) have active compliance violations, and 1 (8.3%) handle RCRA hazardous waste.
How does ZIP 57656 compare to Dewey County and South Dakota averages?
In ZIP 57656, 8.3% of regulated sites are rated High Risk, compared to 2.6% across Dewey County and 0.7% statewide in South Dakota.
What is the EPA Radon Zone and ASTM Phase I screening radius for ZIP 57656?
Geologic screening places ZIP 57656 in EPA Zone 1 — High Potential (> 4.0 pCi/L). Property buyers should screen a 0.25-mile immediate buffer for vapor-intrusion sources and a 1.0-mile radius for CERCLA/RCRA sites.
Is ZIP 57656 (Timber Lake, SD) in a FEMA flood zone and what is the flood disaster history?
Dewey County has recorded 15 historical FEMA federal disaster declarations (8 flood, hurricane, or severe storm declarations). Run a street address scan in ZIP 57656 to unlock the exact parcel FEMA flood zone (AE / VE / X) and mandatory flood insurance status.
Does ZIP 57656 have expansive clay soil, foundation problems, or drinking water violations?
USDA regional soil screening for ZIP 57656 indicates a HIGH shrink-swell risk signal. Within ZIP 57656, federal registries track 0 SDWIS drinking water facilities, 8 Clean Water NPDES permits, and 0 impaired water body dischargers. Unlock a full property report for exact soil LEP %, water table depth, and utility violation dockets.