Okanogan County, Washington — Property Hazard, Flood Zone, Soil, Water & EPA Guide
What Are the Flood, Soil Foundation & EPA Risks in Okanogan County, WA?
In Okanogan County, Washington, public U.S. EPA records track 381 regulated facilities (#24 of 75 in Washington), including 24 (6.3%) High-Risk sites and $5,317,078 in federal penalties. Countywide due diligence also covers 123 Safe Drinking Water (SDWIS) facilities, 126 Clean Water NPDES permits, 12 FEMA Federal Disaster Declarations (4 flood/storm), USDA Soil Foundation Shrink-Swell (LOW signal), and EPA Zone 1 — High Potential (> 4.0 pCi/L).
Okanogan County, WA 6-in-1 Flood, Soil Foundation, Tap Water & Radon Signals
🔒 Parcel-Level Soil LEP %, Water Table Depth & Flood Zone Require Street Address Scan📊 Okanogan County, WA Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 05, 2026)Municipalities in Okanogan County
Top EPA Regulated Facilities in Okanogan County, WA
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 • OKANOGAN, WA (ZIP 98840 Sector) | HIGH (68/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • OROVILLE, WA (ZIP 98844 Sector) | HIGH (67/100) | Significant Violation (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • OMAK, WA (ZIP 98841 Sector) | HIGH (66/100) | Significant Violation (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • RIVERSIDE, WA (ZIP 98849 Sector) | HIGH (65/100) | Significant Violation (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • RIVERSIDE, WA (ZIP 98849 Sector) | HIGH (64/100) | Significant Violation (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • WINTHROP, WA (ZIP 98862 Sector) | HIGH (64/100) | Significant Violation (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • TONASKET, WA (ZIP 98855 Sector) | HIGH (64/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • BREWSTER, WA (ZIP 98812 Sector) | HIGH (64/100) | Significant Violation (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| SILVER MOUNTAIN MINE FREE PREVIEW (LOW RISK) | T38N R26E WM S34 SILVER MOUNTAIN, LOOMIS, WA 98827 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| US BUREAU LAND MGMT OROVILLE FREE PREVIEW (LOW RISK) | T40N R26E S12 SW1/4, OROVILLE, WA 98844 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| US DOI BLM OROVILLE LDFL FREE PREVIEW (LOW RISK) | T40N R27E S18 SW1/4 2.5 MI W, OROVILLE, WA 98844 | LOW (15/100) | No Violation Identified (0 qtrs NC) | $0 |
| US DA FHA BEVERLY BARKER FARM FREE PREVIEW (LOW RISK) | S10 T32N R25EWM SW1/4, OKANOGAN, WA 98840 | LOW (15/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — Okanogan County, Washington Environmental Due Diligence
How many EPA-regulated environmental sites are in Okanogan County, Washington?
Public U.S. EPA records track 381 regulated facilities in Okanogan County, Washington (ranking #24 of 75 jurisdictions in WA). Of those, 24 (6.3%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 64 (16.8%) have active non-compliance quarters.
Which ZIP codes and cities in Okanogan County have the highest regulated facility density?
Within Okanogan County, the highest concentrations of EPA-tracked facilities are located in ZIP 98841 (Omak, 65 sites), ZIP 98840 (Okanogan, 44 sites), ZIP 98844 (Oroville, 40 sites), spanning municipal corridors including Omak (64 sites), Okanogan (43 sites), Oroville (40 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Okanogan County?
Across Okanogan County, 141 facilities (37.0% 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 Okanogan County, WA?
Geologic indoor air screening places Okanogan 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 Okanogan County, WA?
Federal records track 123 Safe Drinking Water (SDWIS) facilities, 126 Clean Water Act NPDES permits, and 23 impaired water dischargers in Okanogan County, alongside 12 historical FEMA federal disaster declarations (4 flood/storm events).
Does Okanogan County, WA have expansive clay soil or foundation risk?
USDA regional soil engineering screening for Okanogan County indicates a LOW shrink-swell risk signal and steel pipe corrosivity rated Low. Run a street address scan to unlock the exact parcel soil series, LEP %, and water table depth.