ZIP 99403 (Clarkston, WA) — Flood Zone, Water Quality, Soil Foundation, Radon & EPA Hazards
ZIP code 99403 in Clarkston, Washington (Asotin County) has 73 EPA-tracked facilities, including 5 High-Risk sites (6.8%), 17 active violators, and $4,048 in federal penalties. Beyond industrial pollution, properties in ZIP 99403 are screened across 1 historical Asotin County FEMA disasters, USDA Soil Foundation Shrink-Swell (HIGH signal), Tap Water & Watershed Permits (34), and EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L).
ZIP 99403 (Clarkston, WA) 6-in-1 Flood, Soil Foundation, Tap Water & Radon Signals
🔒 Parcel-Level Soil LEP %, Water Table Depth & Flood Zone Require Street Address Scan📊 ZIP 99403 (Clarkston, WA) Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 01, 2026)ZIP 99403 Sector Screening Map (High-Risk Pin Coordinates Locked)
Exact street pins for 5 High-Risk and 17 Active Violation sites are redacted on public directory maps.
Regulated EPA Facilities in ZIP 99403 (Clarkston, 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 Score (0–100) | Compliance Status | Enforcement / Unlock |
|---|---|---|---|---|
| 🔒 Locked High-Risk EPA Enforcement Record #1 | 🔒 Exact Street & Parcel Redacted • CLARKSTON, WA (ZIP 99403 Sector) | HIGH (64/100) | Significant Violation (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • CLARKSTON, WA (ZIP 99403 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 • CLARKSTON, WA (ZIP 99403 Sector) | HIGH (64/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • CLARKSTON, WA (ZIP 99403 Sector) | HIGH (64/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • CLARKSTON, WA (ZIP 99403 Sector) | HIGH (64/100) | Significant Violation (3 qtrs NC) | 🔒 3 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • CLARKSTON, WA (ZIP 99403 Sector) | MODERATE (57/100) | Violation Identified (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • CLARKSTON, WA (ZIP 99403 Sector) | MODERATE (45/100) | Violation Identified (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • CLARKSTON, WA (ZIP 99403 Sector) | MODERATE (44/100) | Violation Identified (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| US ARMY COE CLARKSTON RESOURCES FREE PREVIEW (LOW RISK) | SNAKE & CLEARWATER RIVERS, CLARKSTON, WA 99403 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| RILLA SMITH FREE PREVIEW (LOW RISK) | 1050 VINELAND DR, CLARKSTON, WA 99403 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| MAGNUM DEVELOPMENT FREE PREVIEW (LOW RISK) | RESERVOIR RD, CLARKSTON, WA 99403 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| WA AGR ASOTIN 2 FREE PREVIEW (LOW RISK) | 2901 A 6TH AVE, CLARKSTON, WA 99403 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — ZIP 99403 (Clarkston, WA) EPA Dataset & Radon
DATASET: U.S. EPA ECHO • FRS • RCRAInfo • TRI (November 01, 2026)How many EPA-tracked environmental sites are in ZIP code 99403 (Clarkston, WA)?
ZIP code 99403 (Clarkston, WA) contains 73 EPA-tracked facilities, of which 5 (6.8%) are classified in the High-Risk tier, 17 (23.3%) have active compliance violations, and 34 (46.6%) handle RCRA hazardous waste.
How does ZIP 99403 compare to Asotin County and Washington averages?
In ZIP 99403, 6.8% of regulated sites are rated High Risk, compared to 9.0% across Asotin County and 5.2% statewide in Washington.
What is the EPA Radon Zone and ASTM Phase I screening radius for ZIP 99403?
Geologic screening places ZIP 99403 in EPA Zone 2 — Moderate Potential (2.0 – 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 99403 (Clarkston, WA) in a FEMA flood zone and what is the flood disaster history?
Asotin County has recorded 1 historical FEMA federal disaster declarations (1 flood, hurricane, or severe storm declarations). Run a street address scan in ZIP 99403 to unlock the exact parcel FEMA flood zone (AE / VE / X) and mandatory flood insurance status.
Does ZIP 99403 have expansive clay soil, foundation problems, or drinking water violations?
USDA regional soil screening for ZIP 99403 indicates a HIGH shrink-swell risk signal. Within ZIP 99403, federal registries track 2 SDWIS drinking water facilities, 32 Clean Water NPDES permits, and 9 impaired water body dischargers. Unlock a full property report for exact soil LEP %, water table depth, and utility violation dockets.