Knox County, California — Property Hazard, Flood Zone, Soil, Water & EPA Guide
What Are the Flood, Soil Foundation & EPA Risks in Knox County, CA?
In Knox County, California, public U.S. EPA records track 4 regulated facilities (#164 of 164 in California), including 0 (0.0%) High-Risk sites and $0 in federal penalties. Countywide due diligence also covers 4 Safe Drinking Water (SDWIS) facilities, 0 Clean Water NPDES permits, 55 FEMA Federal Disaster Declarations (13 flood/storm), USDA Soil Foundation Shrink-Swell (HIGH signal), and EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L).
Knox 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📊 Knox County, CA Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 03, 2026)Municipalities in Knox County
ZIP Codes in Knox County
Top EPA Regulated Facilities in Knox 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 |
|---|---|---|---|---|
| HI LO MARKET GALESBURG-TREATMENT PLANT FREE PREVIEW (LOW RISK) | , VISTA, CA 92081 | LOW (10/100) | No Violation Identified (0 qtrs NC) | $0 |
| KNOXVILLE IGA-TREATMENT PLANT FREE PREVIEW (LOW RISK) | 1385 PARK CITY DR, VISTA, CA 92081 | LOW (9/100) | Inactive (0 qtrs NC) | $0 |
| CIRCLE K 1233 GALESBURG-TREATMENT PLANT FREE PREVIEW (LOW RISK) | 1385 PARK CITY DR, VISTA, CA 92081 | LOW (9/100) | Inactive (0 qtrs NC) | $0 |
| HY-VEE MAIN-TREATMENT PLANT FREE PREVIEW (LOW RISK) | 1385 PARK CITY DR, VISTA, CA 92081 | LOW (8/100) | Inactive (0 qtrs NC) | $0 |
Frequently Asked Questions — Knox County, California Environmental Due Diligence
How many EPA-regulated environmental sites are in Knox County, California?
Public U.S. EPA records track 4 regulated facilities in Knox County, California (ranking #164 of 164 jurisdictions in CA). Of those, 0 (0.0%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 0 (0.0%) have active non-compliance quarters.
Which ZIP codes and cities in Knox County have the highest regulated facility density?
Within Knox County, the highest concentrations of EPA-tracked facilities are located in ZIP 40905 (Singapore, 2 sites), spanning municipal corridors including Knox.
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Knox County?
Across Knox County, 0 facilities (0.0% 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 Knox County, CA?
Geologic indoor air screening places Knox 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 Knox County, CA?
Federal records track 4 Safe Drinking Water (SDWIS) facilities, 0 Clean Water Act NPDES permits, and 0 impaired water dischargers in Knox County, alongside 55 historical FEMA federal disaster declarations (13 flood/storm events).
Does Knox County, CA have expansive clay soil or foundation risk?
USDA regional soil engineering screening for Knox County indicates a HIGH shrink-swell risk signal and steel pipe corrosivity rated High. Run a street address scan to unlock the exact parcel soil series, LEP %, and water table depth.