Sonoma County, California — Property Hazard, Flood Zone, Soil, Water & EPA Guide
What Are the Flood, Soil Foundation & EPA Risks in Sonoma County, CA?
In Sonoma County, California, public U.S. EPA records track 372 regulated facilities (#62 of 136 in California), including 0 (0.0%) High-Risk sites and $0 in federal penalties. Countywide due diligence also covers 3 Safe Drinking Water (SDWIS) facilities, 361 Clean Water NPDES permits, 4 FEMA Federal Disaster Declarations (4 flood/storm), USDA Soil Foundation Shrink-Swell (MODERATE signal), and EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L).
Sonoma 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📊 Sonoma County, CA Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 05, 2026)Municipalities in Sonoma County
ZIP Codes in Sonoma County
Top EPA Regulated Facilities in Sonoma 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 Regulated EPA Enforcement Record #1 | 🔒 Exact Street & Parcel Redacted • WINDSOR, CA (ZIP 95492 Sector) | MODERATE (39/100) | Violation Identified (7 qtrs NC) | 🔒 7 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • SANTA ROSA, CA (ZIP 95409 Sector) | MODERATE (36/100) | Violation Identified (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • SANTA ROSA, CA (ZIP 95407 Sector) | MODERATE (33/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • SANTA ROSA, CA (ZIP 95407 Sector) | MODERATE (33/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • COTATI, CA (ZIP 94931 Sector) | MODERATE (33/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • HEALDSBURG, CA (ZIP 95448 Sector) | MODERATE (32/100) | Resolved / Historical Non-Compliance (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • WINDSOR, CA (ZIP 95492 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (6 qtrs NC) | 🔒 6 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • CALISTOGA, CA (ZIP 94515 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| HAWTHORNE HYDROPONICS LLC DBA GENERAL HYDROPONICS FREE PREVIEW (LOW RISK) | 2877 GIFFEN AVE, SANTA ROSA, CA 95407 | LOW (25/100) | No Violation Identified (0 qtrs NC) | $0 |
| RACK AND RIDDLE GEYSERVILLE FREE PREVIEW (LOW RISK) | 4001 HIGHWAY 128, GEYSERVILLE, CA 95441 | LOW (25/100) | No Violation Identified (0 qtrs NC) | $0 |
| WINCHESTER INTERCONNECT FREE PREVIEW (LOW RISK) | 5590 SKYLANE BOULEVARD, SANTA ROSA, CA 95403 | LOW (24/100) | No Violation Identified (0 qtrs NC) | $0 |
| GEYSER PEAK WINERY FREE PREVIEW (LOW RISK) | 2306 MAGNOLIA DRIVE, HEALDSBURG, CA 95448 | LOW (24/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — Sonoma County, California Environmental Due Diligence
How many EPA-regulated environmental sites are in Sonoma County County, California?
Public U.S. EPA records track 372 regulated facilities in Sonoma County County, California (ranking #62 of 136 jurisdictions in CA). Of those, 0 (0.0%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 9 (2.4%) have active non-compliance quarters.
Which ZIP codes and cities in Sonoma County County have the highest regulated facility density?
Within Sonoma County County, the highest concentrations of EPA-tracked facilities are located in ZIP 95476 (Sonoma, 663 sites), ZIP 95409 (Santa Rosa, 531 sites), ZIP 95442 (Glen Ellen, 104 sites), spanning municipal corridors including Glen Ellen (103 sites), El Verano (5 sites), Sablon (1 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Sonoma County County?
Across Sonoma County County, 26 facilities (7.0% 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 Sonoma County County, CA?
Geologic indoor air screening places Sonoma County 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 Sonoma County County, CA?
Federal records track 3 Safe Drinking Water (SDWIS) facilities, 361 Clean Water Act NPDES permits, and 204 impaired water dischargers in Sonoma County County, alongside 4 historical FEMA federal disaster declarations (4 flood/storm events).
Does Sonoma County, CA have expansive clay soil or foundation risk?
USDA regional soil engineering screening for Sonoma 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.