Siskiyou County, California — Flood Zone, Water Quality, Soil Foundation, Radon & EPA Hazards
In Siskiyou County, California, public U.S. EPA records track 761 regulated facilities (#49 of 136 in California), including 13 (1.7%) High-Risk sites and $5,705,268 in federal penalties. Countywide due diligence also covers 68 Safe Drinking Water (SDWIS) facilities, 75 Clean Water NPDES permits, 4 FEMA Federal Disaster Declarations (2 flood/storm), USDA Soil Foundation Shrink-Swell (MODERATE signal), and EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L).
Siskiyou County, CA 6-in-1 Flood, Soil Foundation, Tap Water & Radon Signals
🔒 Parcel-Level Soil LEP %, Water Table Depth & Flood Zone Require Street Address Scan📊 Siskiyou County, CA Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 01, 2026)Municipalities in Siskiyou County
ZIP Codes in Siskiyou County
Top EPA Regulated Facilities in Siskiyou County, CA
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 • YREKA, CA (ZIP 96097 Sector) | HIGH (64/100) | No Violation Identified (0 qtrs NC) | 🔒 $100,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • DUNSMUIR, CA (ZIP 96025 Sector) | HIGH (64/100) | No Violation Identified (0 qtrs NC) | 🔒 $100,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • WEED, CA (ZIP 96094 Sector) | HIGH (64/100) | Resolved / Historical Non-Compliance (1 qtrs NC) | 🔒 $10,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • DUNSMUIR, CA (ZIP 96025 Sector) | HIGH (64/100) | No Violation Identified (0 qtrs NC) | 🔒 $10,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • MOUNT SHASTA, CA (ZIP 96067 Sector) | HIGH (64/100) | Significant Violation (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • , CA (ZIP Sector) | HIGH (64/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • SACRAMENTO, CA (ZIP 95016 Sector) | MODERATE (45/100) | Violation Identified (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • YREKA, CA (ZIP 96097 Sector) | MODERATE (41/100) | Violation Identified (7 qtrs NC) | 🔒 7 Qtrs Non-Compliance • Unlock → |
| WEED UNION ELEMENTARY SCHOOL DISTRICT FREE PREVIEW (LOW RISK) | 575 WHITE AVE, WEED, CA 96094 | LOW (25/100) | No Violation Identified (0 qtrs NC) | $0 |
| IRONGATE HATCHERY WWTS FREE PREVIEW (LOW RISK) | COPCO RD, HORNBROOK, CA 96044 | LOW (18/100) | Unknown (0 qtrs NC) | $0 |
| PONDOSA MILL SITE FREE PREVIEW (LOW RISK) | 1 PONDOSA ROAD, PONDOSA, CA 96057 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| LITTLE SHASTA ELEMENTARY SCHOOL FREE PREVIEW (LOW RISK) | 409 LOWER LITTLE SHASTA ROAD, MONTAGUE, CA 96064 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — Siskiyou County, California Environmental Due Diligence
How many EPA-regulated environmental sites are in Siskiyou County, California?
Public U.S. EPA records track 761 regulated facilities in Siskiyou County, California (ranking #49 of 136 jurisdictions in CA). Of those, 13 (1.7%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 30 (3.9%) have active non-compliance quarters.
Which ZIP codes and cities in Siskiyou County have the highest regulated facility density?
Within Siskiyou County, the highest concentrations of EPA-tracked facilities are located in ZIP 96097 (Yreka, 220 sites), ZIP 96067 (Mount Shasta, 138 sites), ZIP 96094 (Weed, 106 sites), spanning municipal corridors including Yreka (216 sites), Mount Shasta (128 sites), Weed (111 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Siskiyou County?
Across Siskiyou County, 664 facilities (87.3% 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 Siskiyou County, CA?
Geologic indoor air screening places Siskiyou 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 Siskiyou County, CA?
Federal records track 68 Safe Drinking Water (SDWIS) facilities, 75 Clean Water Act NPDES permits, and 50 impaired water dischargers in Siskiyou County, alongside 4 historical FEMA federal disaster declarations (2 flood/storm events).
Does Siskiyou County, CA have expansive clay soil or foundation risk?
USDA regional soil engineering screening for Siskiyou County indicates a MODERATE 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.