ZIP 91903 (Alpine, CA) — Flood Zone, Water Quality, Soil Foundation, Radon & EPA Hazards
ZIP code 91903 in Alpine, California (San Diego County) has 4 EPA-tracked facilities, including 1 High-Risk sites (25.0%), 1 active violators, and $0 in federal penalties. Beyond industrial pollution, properties in ZIP 91903 are screened across 3 historical San Diego County FEMA disasters, USDA Soil Foundation Shrink-Swell (LOW signal), Tap Water & Watershed Permits (3), and EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L).
ZIP 91903 (Alpine, 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 91903 (Alpine, CA) Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 02, 2026)ZIP 91903 Sector Screening Map (High-Risk Pin Coordinates Locked)
Exact street pins for 1 High-Risk and 1 Active Violation sites are redacted on public directory maps.
Regulated EPA Facilities in ZIP 91903 (Alpine, 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 • BONITA, CA (ZIP 91903 Sector) | MODERATE (33/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • ALPINE, CA (ZIP 91903 Sector) | MODERATE (30/100) | Violation Identified (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| PALO VERDE RANCH FLOOD CONTROL FREE PREVIEW (LOW RISK) | 9999 SECTION 35 T15S R2E, ALPINE, CA 91903 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| ANDERSON TRUCK TRAIL FREE PREVIEW (LOW RISK) | 589 ANDERSON ROAD, ALPINE, CA 91903 | LOW (12/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — ZIP 91903 (Alpine, 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 91903 (Alpine, CA)?
ZIP code 91903 (Alpine, CA) contains 4 EPA-tracked facilities, of which 1 (25.0%) are classified in the High-Risk tier, 1 (25.0%) have active compliance violations, and 1 (25.0%) handle RCRA hazardous waste.
How does ZIP 91903 compare to San Diego County and California averages?
In ZIP 91903, 25.0% of regulated sites are rated High Risk, compared to 0.1% across San Diego County and 0.3% statewide in California.
What is the EPA Radon Zone and ASTM Phase I screening radius for ZIP 91903?
Geologic screening places ZIP 91903 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 91903 (Alpine, CA) in a FEMA flood zone and what is the flood disaster history?
San Diego County has recorded 3 historical FEMA federal disaster declarations (3 flood, hurricane, or severe storm declarations). Run a street address scan in ZIP 91903 to unlock the exact parcel FEMA flood zone (AE / VE / X) and mandatory flood insurance status.
Does ZIP 91903 have expansive clay soil, foundation problems, or drinking water violations?
USDA regional soil screening for ZIP 91903 indicates a LOW shrink-swell risk signal. Within ZIP 91903, federal registries track 1 SDWIS drinking water facilities, 2 Clean Water NPDES permits, and 1 impaired water body dischargers. Unlock a full property report for exact soil LEP %, water table depth, and utility violation dockets.