ZIP 91789 (Walnut, CA) — Flood Zone, Water Quality, Soil Foundation, Radon & EPA Hazards
ZIP code 91789 in Walnut, California (Los Angeles County) has 1,007 EPA-tracked facilities, including 4 High-Risk sites (0.4%), 2 active violators, and $96,000 in federal penalties. Beyond industrial pollution, properties in ZIP 91789 are screened across 12 historical Los Angeles County FEMA disasters, USDA Soil Foundation Shrink-Swell (LOW signal), Tap Water & Watershed Permits (145), and EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L).
ZIP 91789 (Walnut, 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 91789 (Walnut, CA) Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 02, 2026)ZIP 91789 Sector Screening Map (High-Risk Pin Coordinates Locked)
Exact street pins for 4 High-Risk and 2 Active Violation sites are redacted on public directory maps.
Regulated EPA Facilities in ZIP 91789 (Walnut, 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 • WALNUT, CA (ZIP 91789 Sector) | MODERATE (44/100) | No Violation Identified (0 qtrs NC) | 🔒 $10,000+ Federal Fine • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • WALNUT, CA (ZIP 91789 Sector) | MODERATE (35/100) | Resolved / Historical Non-Compliance (3 qtrs NC) | 🔒 $10,000+ Federal Fine • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • WALNUT, CA (ZIP 91789 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • WALNUT, CA (ZIP 91789 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • WALNUT, CA (ZIP 91789 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • WALNUT, CA (ZIP 91789 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • DIAMOND BAR, CA (ZIP 91789 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • WALNUT, CA (ZIP 91789 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| DIRECT CHB FREE PREVIEW (LOW RISK) | 20275 BUSINESS PKWY, CITY OF INDUSTRY, CA 91789 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| COPY MASTERS THE FREE PREVIEW (LOW RISK) | 20425 E VALLEY BLVD, WALNUT, CA 91789 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| FAIRWAY AUTO TECH FREE PREVIEW (LOW RISK) | 19729 E VALLEY BLVD, WALNUT, CA 91789 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| PTAY INC DBA PETE'S AUTO BODY FREE PREVIEW (LOW RISK) | 319 S LEMON CREEK DR # C, WALNUT, CA 91789 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — ZIP 91789 (Walnut, 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 91789 (Walnut, CA)?
ZIP code 91789 (Walnut, CA) contains 1,007 EPA-tracked facilities, of which 4 (0.4%) are classified in the High-Risk tier, 2 (0.2%) have active compliance violations, and 870 (86.4%) handle RCRA hazardous waste.
How does ZIP 91789 compare to Los Angeles County and California averages?
In ZIP 91789, 0.4% of regulated sites are rated High Risk, compared to 0.2% across Los Angeles County and 0.3% statewide in California.
What is the EPA Radon Zone and ASTM Phase I screening radius for ZIP 91789?
Geologic screening places ZIP 91789 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 91789 (Walnut, CA) in a FEMA flood zone and what is the flood disaster history?
Los Angeles County has recorded 12 historical FEMA federal disaster declarations (5 flood, hurricane, or severe storm declarations). Run a street address scan in ZIP 91789 to unlock the exact parcel FEMA flood zone (AE / VE / X) and mandatory flood insurance status.
Does ZIP 91789 have expansive clay soil, foundation problems, or drinking water violations?
USDA regional soil screening for ZIP 91789 indicates a LOW shrink-swell risk signal. Within ZIP 91789, federal registries track 1 SDWIS drinking water facilities, 144 Clean Water NPDES permits, and 59 impaired water body dischargers. Unlock a full property report for exact soil LEP %, water table depth, and utility violation dockets.