ZIP 94509 (Antioch, CA) — Flood Zone, Water Quality, Soil Foundation, Radon & EPA Hazards
ZIP code 94509 in Antioch, California (Contra Costa County) has 837 EPA-tracked facilities, including 0 High-Risk sites (0.0%), 1 active violators, and $0 in federal penalties. Beyond industrial pollution, properties in ZIP 94509 are screened across 2 historical Contra Costa County FEMA disasters, USDA Soil Foundation Shrink-Swell (HIGH signal), Tap Water & Watershed Permits (54), and EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L).
ZIP 94509 (Antioch, CA) 6-in-1 Flood, Soil Foundation, Tap Water & Radon Signals
🔒 Parcel-Level Soil LEP %, Water Table Depth & Flood Zone Require Street Address Scan📊 ZIP 94509 (Antioch, CA) Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 02, 2026)ZIP 94509 Sector Screening Map (High-Risk Pin Coordinates Locked)
Exact street pins for 0 High-Risk and 1 Active Violation sites are redacted on public directory maps.
Regulated EPA Facilities in ZIP 94509 (Antioch, 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 Score (0–100) | Compliance Status | Enforcement / Unlock |
|---|---|---|---|---|
| 🔒 Locked Regulated EPA Enforcement Record #1 | 🔒 Exact Street & Parcel Redacted • ANTIOCH, CA (ZIP 94509 Sector) | MODERATE (36/100) | Resolved / Historical Non-Compliance (3 qtrs NC) | 🔒 3 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • ANTIOCH, CA (ZIP 94509 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • ANTIOCH, CA (ZIP 94509 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • ANTIOCH, CA (ZIP 94509 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • ANTIOCH, CA (ZIP 94509 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • ANTIOCH, CA (ZIP 94509 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • ANTIOCH, CA (ZIP 94509 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • ANTIOCH, CA (ZIP 94509 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| KIE-CON INC FREE PREVIEW (LOW RISK) | 3551 WILBUR AVENUE, ANTIOCH, CA 94509 | LOW (24/100) | No Violation Identified (0 qtrs NC) | $0 |
| MARKSTEIN SALES COMPANY FREE PREVIEW (LOW RISK) | 1645 DRIVE IN WAY, ANTIOCH, CA 94509 | LOW (19/100) | No Violation Identified (0 qtrs NC) | $0 |
| CA-4 EASTBOUND, NEAR CONTRA LOMA BOULEVARD UNDERCROSSING FREE PREVIEW (LOW RISK) | LAT/LONG_USED, ANTIOCH, CA 94509 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| STATE RTE 4 STATE RTE 160 INTERCHANGE FREE PREVIEW (LOW RISK) | STATE RTE 4 AND STATE RTE 160, ANTIOCH, CA 94509 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — ZIP 94509 (Antioch, CA) EPA Dataset & Radon
DATASET: U.S. EPA ECHO • FRS • RCRAInfo • TRI (November 02, 2026)How many EPA-tracked environmental sites are in ZIP code 94509 (Antioch, CA)?
ZIP code 94509 (Antioch, CA) contains 837 EPA-tracked facilities, of which 0 (0.0%) are classified in the High-Risk tier, 1 (0.1%) have active compliance violations, and 786 (93.9%) handle RCRA hazardous waste.
How does ZIP 94509 compare to Contra Costa County and California averages?
In ZIP 94509, 0.0% of regulated sites are rated High Risk, compared to 0.3% across Contra Costa County and 0.3% statewide in California.
What is the EPA Radon Zone and ASTM Phase I screening radius for ZIP 94509?
Geologic screening places ZIP 94509 in EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L). Property buyers should screen a 0.25-mile immediate buffer for vapor-intrusion sources and a 1.0-mile radius for CERCLA/RCRA sites.
Is ZIP 94509 (Antioch, CA) in a FEMA flood zone and what is the flood disaster history?
Contra Costa County has recorded 2 historical FEMA federal disaster declarations (2 flood, hurricane, or severe storm declarations). Run a street address scan in ZIP 94509 to unlock the exact parcel FEMA flood zone (AE / VE / X) and mandatory flood insurance status.
Does ZIP 94509 have expansive clay soil, foundation problems, or drinking water violations?
USDA regional soil screening for ZIP 94509 indicates a HIGH shrink-swell risk signal. Within ZIP 94509, federal registries track 1 SDWIS drinking water facilities, 53 Clean Water NPDES permits, and 28 impaired water body dischargers. Unlock a full property report for exact soil LEP %, water table depth, and utility violation dockets.