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 7,981 regulated facilities (#16 of 136 in California), including 31 (0.4%) High-Risk sites and $11,908,958 in federal penalties. Countywide due diligence also covers 469 Safe Drinking Water (SDWIS) facilities, 618 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 High-Risk EPA Enforcement Record #1 | 🔒 Exact Street & Parcel Redacted • PETALUMA (HISTORICAL), CA (ZIP 94952 Sector) | HIGH (98/100) | Significant Violation (12 qtrs NC) | 🔒 $100,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • SANTA ROSA, CA (ZIP 95407 Sector) | HIGH (77/100) | Significant Violation (12 qtrs NC) | 🔒 $10,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • FORESTVILLE, CA (ZIP 95436 Sector) | HIGH (64/100) | Significant Violation (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • PETALUMA, CA (ZIP 94954 Sector) | MODERATE (59/100) | Resolved / Historical Non-Compliance (6 qtrs NC) | 🔒 $100,000+ Federal Fine • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • SONOMA, CA (ZIP 95476 Sector) | MODERATE (56/100) | Violation Identified (7 qtrs NC) | 🔒 7 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • SANTA ROSA, CA (ZIP 95403 Sector) | MODERATE (55/100) | Resolved / Historical Non-Compliance (2 qtrs NC) | 🔒 $10,000+ Federal Fine • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • PETALUMA, CA (ZIP 94952 Sector) | MODERATE (55/100) | Violation Identified (7 qtrs NC) | 🔒 7 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • PETALUMA, CA (ZIP 94954 Sector) | MODERATE (51/100) | No Violation Identified (0 qtrs NC) | 🔒 $100,000+ Federal Fine • Unlock → |
| FIRST CLASS AUTO BODY AND MONROE TIRE FREE PREVIEW (LOW RISK) | 709 SANTA ROSA AVE, SANTA ROSA, CA 95404 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| TJ MAXX 1090 FREE PREVIEW (LOW RISK) | 2226 CLEVELAND AVE, SANTA ROSA, CA 95403 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| SEGHESIO FARMS FREE PREVIEW (LOW RISK) | , , CA | LOW (13/100) | No Violation Identified (0 qtrs NC) | $0 |
| SONOMA SPRINGS FREE PREVIEW (LOW RISK) | , GLEN ELLEN, CA 95442 | LOW (12/100) | 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, California?
Public U.S. EPA records track 7,981 regulated facilities in Sonoma County, California (ranking #16 of 136 jurisdictions in CA). Of those, 31 (0.4%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 69 (0.9%) have active non-compliance quarters.
Which ZIP codes and cities in Sonoma County have the highest regulated facility density?
Within Sonoma County, the highest concentrations of EPA-tracked facilities are located in ZIP 95403 (Santa Rosa, 801 sites), ZIP 94952 (Petaluma, 774 sites), ZIP 95407 (Santa Rosa, 770 sites), spanning municipal corridors including Santa Rosa (3,759 sites), Petaluma (1,462 sites), Healdsburg (593 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Sonoma County?
Across Sonoma County, 7,358 facilities (92.2% 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, CA?
Geologic indoor air screening places Sonoma 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, CA?
Federal records track 469 Safe Drinking Water (SDWIS) facilities, 618 Clean Water Act NPDES permits, and 410 impaired water dischargers in Sonoma 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.