Diamond Bar, California — Property Hazard, Flood Zone, Soil, Water & Market Guide
What Are the Major Property, Flood, Soil & Environmental Risks in Diamond Bar, CA?
Public U.S. EPA records track 1,126 regulated facilities in Diamond Bar, California (Los Angeles County), including 0 High-Risk sites (0.0%) and 0 active violators. In addition to industrial waste, Diamond Bar properties are screened for Tap Water & Watershed Permits (100 systems), USDA Soil Foundation Shrink-Swell (LOW signal), 12 County FEMA Disaster Declarations, and EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L).
Diamond Bar, CA 6-in-1 Flood, Soil Foundation, Tap Water & Radon Signals
🔒 Parcel-Level Soil LEP %, Water Table Depth & Flood Zone Require Street Address Scan📊 Diamond Bar, CA Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 03, 2026)ZIP Codes in Diamond Bar, CA
Highest-Scored EPA Regulated Facilities in Diamond Bar, 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 • DIAMOND BAR, CA (ZIP 91765 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • DIAMOND BAR, CA (ZIP 91765 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • DIAMOND BAR, CA (ZIP 91765 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • DIAMOND BAR, CA (ZIP 91765 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • DIAMOND BAR, CA (ZIP 91765 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 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 #7 | 🔒 Exact Street & Parcel Redacted • DIAMOND BAR, CA (ZIP 91765 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • DIAMOND BAR, CA (ZIP 91765 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| AUTO SQUAD, LLC FREE PREVIEW (LOW RISK) | 780 NORTH DIAMOND BAR BLVD., B6, DIAMOND BAR, CA 91765 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| DIAMOND BAR TRANSMISSION FREE PREVIEW (LOW RISK) | 796 N DIAMOND BAR BLVD # A-13, DIAMOND BAR, CA 91765 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| JEON CHO DENTAL PARTNERSHIP FREE PREVIEW (LOW RISK) | 646 N DIAMOND BAR BLVD, DIAMOND BAR, CA 91765 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| AUTO SQUAD DB FREE PREVIEW (LOW RISK) | 780 N DIAMOND BAR BLVD, DIAMOND BAR, CA 91765 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — Diamond Bar, California Environmental Risk & Radon
How many EPA-regulated facilities are in Diamond Bar, CA?
U.S. EPA records track 1,126 regulated facilities in Diamond Bar, California, including 0 high-risk sites (0.0%), 0 active violators (0.0%), and 1,020 RCRA hazardous waste handlers (90.6%).
Which ZIP codes in Diamond Bar, CA have the most EPA-tracked sites?
Within Diamond Bar, regulated facilities are primarily concentrated across ZIP 91765 (1,062 sites), ZIP 92756 (5 sites), ZIP 91675 (1 sites), ZIP 91465 (1 sites).
How can I check a specific house or commercial property in Diamond Bar, CA?
Enter the exact street address in Diamond Bar into the FullPropertyReport radius scanner to screen all EPA ECHO, FRS, RCRA, TRI, USDA soil foundation shrink-swell, drinking water (SDWIS), FEMA flood zone, and county radon records within 0.5 to 3.0 miles.
Is tap water safe in Diamond Bar, CA and how many EPA water permits exist?
In Diamond Bar, CA, federal registries track 4 Safe Drinking Water (SDWIS) facilities, 96 Clean Water Act NPDES permits, and 3 impaired water body dischargers.
What is the soil foundation risk and FEMA flood disaster history in Diamond Bar, CA?
USDA regional soil screening for Diamond Bar indicates a LOW shrink-swell foundation signal, and Los Angeles County has recorded 12 federal FEMA disaster declarations (5 flood/severe storm declarations). Run an address scan to unlock exact parcel soil LEP %, water table depth, and flood zone.