Columbia County, Washington — Property Hazard, Flood Zone, Soil, Water & EPA Guide
What Are the Flood, Soil Foundation & EPA Risks in Columbia County, WA?
In Columbia County, Washington, public U.S. EPA records track 48 regulated facilities (#59 of 75 in Washington), including 3 (6.2%) High-Risk sites and $0 in federal penalties. Countywide due diligence also covers 11 Safe Drinking Water (SDWIS) facilities, 25 Clean Water NPDES permits, 1 FEMA Federal Disaster Declarations (1 flood/storm), USDA Soil Foundation Shrink-Swell (MODERATE signal), and EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L).
Columbia 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📊 Columbia County, WA Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 05, 2026)Municipalities in Columbia County
ZIP Codes in Columbia County
Top EPA Regulated Facilities in Columbia 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 • DAYTON, WA (ZIP 99328 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 • STARBUCK, WA (ZIP 99359 Sector) | HIGH (64/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • DAYTON, WA (ZIP 99328 Sector) | HIGH (64/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • POMEROY, WA (ZIP 99347 Sector) | MODERATE (40/100) | Violation Identified (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • POMEROY, WA (ZIP 99347 Sector) | MODERATE (40/100) | Violation Identified (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • DAYTON, WA (ZIP 99328 Sector) | MODERATE (39/100) | Violation Identified (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • STARBUCK, WA (ZIP 99359 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (3 qtrs NC) | 🔒 3 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • DAYTON, WA (ZIP 99328 Sector) | MODERATE (30/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| DAYTON ACCLIMATION POND FREE PREVIEW (LOW RISK) | COTTONWOOD STREET, DAYTON, WA 99328 | LOW (18/100) | No Violation Identified (0 qtrs NC) | $0 |
| PORTLAND GENERAL ELECTRIC CO DAYTON FREE PREVIEW (LOW RISK) | 102 BLUE NORTHER, DAYTON, WA 99328 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| WA AGR COLUMBIA 1 FREE PREVIEW (LOW RISK) | 251 N PINE ST, DAYTON, WA 99328 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| QWEST DAYTON CO FREE PREVIEW (LOW RISK) | 116 S 1ST ST, DAYTON, WA 99328 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — Columbia County, Washington Environmental Due Diligence
How many EPA-regulated environmental sites are in Columbia County, Washington?
Public U.S. EPA records track 48 regulated facilities in Columbia County, Washington (ranking #59 of 75 jurisdictions in WA). Of those, 3 (6.2%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 7 (14.6%) have active non-compliance quarters.
Which ZIP codes and cities in Columbia County have the highest regulated facility density?
Within Columbia County, the highest concentrations of EPA-tracked facilities are located in ZIP 99328 (Dayton, 46 sites), ZIP 99359 (Starbuck, 9 sites), spanning municipal corridors including Dayton (45 sites), Starbuck (10 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Columbia County?
Across Columbia County, 22 facilities (45.8% 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 Columbia County, WA?
Geologic indoor air screening places Columbia County in EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L). Counties in EPA Radon Zone 2 have a predicted average indoor radon level between 2.0 and 4.0 pCi/L. Testing basement or ground-floor living areas is recommended during home inspection.
How many drinking water systems (SDWIS), impaired water bodies, and FEMA flood disasters are recorded in Columbia County, WA?
Federal records track 11 Safe Drinking Water (SDWIS) facilities, 25 Clean Water Act NPDES permits, and 7 impaired water dischargers in Columbia County, alongside 1 historical FEMA federal disaster declarations (1 flood/storm events).
Does Columbia County, WA have expansive clay soil or foundation risk?
USDA regional soil engineering screening for Columbia 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.