Contra Costa County, California — Property Hazard, Flood Zone, Soil, Water & EPA Guide
What Are the Flood, Soil Foundation & EPA Risks in Contra Costa County, CA?
In Contra Costa County, California, public U.S. EPA records track 19,859 regulated facilities (#8 of 136 in California), including 52 (0.3%) High-Risk sites and $50,447,079 in federal penalties. Countywide due diligence also covers 117 Safe Drinking Water (SDWIS) facilities, 442 Clean Water NPDES permits, 2 FEMA Federal Disaster Declarations (2 flood/storm), USDA Soil Foundation Shrink-Swell (HIGH signal), and EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L).
Contra Costa 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📊 Contra Costa County, CA Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 05, 2026)Municipalities in Contra Costa County
ZIP Codes in Contra Costa County
Top EPA Regulated Facilities in Contra Costa 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 • MARTINEZ, CA (ZIP 94553 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 • MARTINEZ, CA (ZIP 94553 Sector) | HIGH (98/100) | Significant Violation (12 qtrs NC) | 🔒 $100,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • RICHMOND, CA (ZIP 94801 Sector) | HIGH (98/100) | Significant Violation (12 qtrs NC) | 🔒 $100,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • PITTSBURG, CA (ZIP 94565 Sector) | HIGH (97/100) | Significant Violation (12 qtrs NC) | 🔒 $100,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • RICHMOND, CA (ZIP 94801 Sector) | HIGH (97/100) | Significant Violation (12 qtrs NC) | 🔒 $100,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • MARTINEZ, CA (ZIP 94553 Sector) | HIGH (92/100) | Significant Violation (12 qtrs NC) | 🔒 $10,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • BAY POINT, CA (ZIP 94565 Sector) | HIGH (90/100) | Significant Violation (12 qtrs NC) | 🔒 $10,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • CLAYTON, CA (ZIP 94517 Sector) | HIGH (89/100) | Significant Violation (12 qtrs NC) | 🔒 $10,000+ Federal Fine • Unlock → |
| GV AUTOMOTIVE INC FREE PREVIEW (LOW RISK) | 243 23RD ST, RICHMOND, CA 94804 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — Contra Costa County, California Environmental Due Diligence
How many EPA-regulated environmental sites are in Contra Costa County, California?
Public U.S. EPA records track 19,859 regulated facilities in Contra Costa County, California (ranking #8 of 136 jurisdictions in CA). Of those, 52 (0.3%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 59 (0.3%) have active non-compliance quarters.
Which ZIP codes and cities in Contra Costa County have the highest regulated facility density?
Within Contra Costa County, the highest concentrations of EPA-tracked facilities are located in ZIP 94520 (Concord, 1,373 sites), ZIP 94553 (Martinez, 1,106 sites), ZIP 94598 (Walnut Creek, 1,084 sites), spanning municipal corridors including Concord (3,588 sites), Walnut Creek (3,184 sites), Richmond (2,092 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Contra Costa County?
Across Contra Costa County, 19,585 facilities (98.6% 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 Contra Costa County, CA?
Geologic indoor air screening places Contra Costa 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 Contra Costa County, CA?
Federal records track 117 Safe Drinking Water (SDWIS) facilities, 442 Clean Water Act NPDES permits, and 140 impaired water dischargers in Contra Costa County, alongside 2 historical FEMA federal disaster declarations (2 flood/storm events).
Does Contra Costa County, CA have expansive clay soil or foundation risk?
USDA regional soil engineering screening for Contra Costa 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.