ZIP 99820 (Angoon, AK) — Flood Zone, Water Quality, Soil Foundation, Radon & EPA Hazards
ZIP code 99820 in Angoon, Alaska (Hoonah-Angoon County) has 10 EPA-tracked facilities, including 4 High-Risk sites (40.0%), 5 active violators, and $288,784 in federal penalties. Beyond industrial pollution, properties in ZIP 99820 are screened across 24 historical Hoonah-Angoon County FEMA disasters, USDA Soil Foundation Shrink-Swell (LOW signal), Tap Water & Watershed Permits (10), and EPA Zone 3 — Low Potential (< 2.0 pCi/L).
ZIP 99820 (Angoon, AK) 6-in-1 Flood, Soil Foundation, Tap Water & Radon Signals
🔒 Parcel-Level Soil LEP %, Water Table Depth & Flood Zone Require Street Address Scan📊 ZIP 99820 (Angoon, AK) Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 01, 2026)ZIP 99820 Sector Screening Map (High-Risk Pin Coordinates Locked)
Exact street pins for 4 High-Risk and 5 Active Violation sites are redacted on public directory maps.
Regulated EPA Facilities in ZIP 99820 (Angoon, AK)
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 • ANGOON, AK (ZIP 99820 Sector) | HIGH (85/100) | Violation Identified (12 qtrs NC) | 🔒 $100,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • ANGOON, AK (ZIP 99820 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 • ANGOON, AK (ZIP 99820 Sector) | HIGH (64/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • ANGOON, AK (ZIP 99820 Sector) | MODERATE (50/100) | Violation Identified (12 qtrs NC) | 🔒 Federal Penalty on File • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • ANGOON, AK (ZIP 99820 Sector) | MODERATE (39/100) | Violation Identified (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| INSIDE PASSAGE ELECTRIC COOP - ANGOON FREE PREVIEW (LOW RISK) | 413 KATANOOK ST, ANGOON, AK 99820 | LOW (19/100) | No Violation Identified (0 qtrs NC) | $0 |
| KOOTZNOOWOO INC FREE PREVIEW (LOW RISK) | MAIN ST, ANGOON, AK 99820 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| USDOT CG GRAVE ISLAND LIGHT FREE PREVIEW (LOW RISK) | PYBUS BAY 18 MI SE OF CY, ANGOON, AK 99820 | LOW (15/100) | No Violation Identified (0 qtrs NC) | $0 |
| THAYER CREEK HYDROELECTRIC FREE PREVIEW (LOW RISK) | TURN POINT, ANGOON, AK 99820 | LOW (11/100) | No Violation Identified (0 qtrs NC) | $0 |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • ANGOON, AK (ZIP 99820 Sector) | LOW (11/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
Frequently Asked Questions — ZIP 99820 (Angoon, AK) EPA Dataset & Radon
DATASET: U.S. EPA ECHO • FRS • RCRAInfo • TRI (November 01, 2026)How many EPA-tracked environmental sites are in ZIP code 99820 (Angoon, AK)?
ZIP code 99820 (Angoon, AK) contains 10 EPA-tracked facilities, of which 4 (40.0%) are classified in the High-Risk tier, 5 (50.0%) have active compliance violations, and 4 (40.0%) handle RCRA hazardous waste.
How does ZIP 99820 compare to Hoonah-Angoon County and Alaska averages?
In ZIP 99820, 40.0% of regulated sites are rated High Risk, compared to 13.2% across Hoonah-Angoon County and 2.0% statewide in Alaska.
What is the EPA Radon Zone and ASTM Phase I screening radius for ZIP 99820?
Geologic screening places ZIP 99820 in EPA Zone 3 — Low Potential (< 2.0 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 99820 (Angoon, AK) in a FEMA flood zone and what is the flood disaster history?
Hoonah-Angoon County has recorded 24 historical FEMA federal disaster declarations (12 flood, hurricane, or severe storm declarations). Run a street address scan in ZIP 99820 to unlock the exact parcel FEMA flood zone (AE / VE / X) and mandatory flood insurance status.
Does ZIP 99820 have expansive clay soil, foundation problems, or drinking water violations?
USDA regional soil screening for ZIP 99820 indicates a LOW shrink-swell risk signal. Within ZIP 99820, federal registries track 4 SDWIS drinking water facilities, 6 Clean Water NPDES permits, and 1 impaired water body dischargers. Unlock a full property report for exact soil LEP %, water table depth, and utility violation dockets.