Portola Valley, California — Property Hazard, Flood Zone, Soil, Water & Market Guide
What Are the Major Property, Flood, Soil & Environmental Risks in Portola Valley, CA?
Public U.S. EPA records track 164 regulated facilities in Portola Valley, California (San Mateo County), including 0 High-Risk sites (0.0%) and 0 active violators. In addition to industrial waste, Portola Valley properties are screened for Tap Water & Watershed Permits (18 systems), USDA Soil Foundation Shrink-Swell (MODERATE signal), 4 County FEMA Disaster Declarations, and EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L).
Portola Valley, CA 6-in-1 Flood, Soil Foundation, Tap Water & Radon Signals
🔒 Parcel-Level Soil LEP %, Water Table Depth & Flood Zone Require Street Address Scan📊 Portola Valley, CA Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 03, 2026)ZIP Codes in Portola Valley, CA
Highest-Scored EPA Regulated Facilities in Portola Valley, 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 • PORTOLA VALLEY, CA (ZIP 94028 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • PORTOLA VALLEY, CA (ZIP 94028 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • PORTOLA VALLEY, CA (ZIP 94028 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • PORTOLA VALLEY, CA (ZIP 94028 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • PORTOLA VALLEY, CA (ZIP 94028 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • PORTOLA VALLEY, CA (ZIP 94028 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • PORTOLA VALLEY, CA (ZIP 94028 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • PORTOLA VALLEY, CA (ZIP 94028 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| CALIFORNIA WATER SERVICE COMPANY BG-29 FREE PREVIEW (LOW RISK) | NEXT TO 147 GOYA RD, LAT 37.39056; LONG -122.21408, PORTOLA VALLEY, CA 94028 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| PONY TRACKS RANCH FREE PREVIEW (LOW RISK) | 495 OLD SPANISH TRAIL, PORTOLA VALLEY, CA 94028 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| THE SEQUOIAS PORTOLA VALLEY FREE PREVIEW (LOW RISK) | 501 PORTOLA RD, PORTOLA VALLEY, CA 94028 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| WOODSIDE PRIORY SCHOOL FREE PREVIEW (LOW RISK) | 302 PORTOLA ROAD, PORTOLA VALLEY, CA 94028 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — Portola Valley, California Environmental Risk & Radon
How many EPA-regulated facilities are in Portola Valley, CA?
U.S. EPA records track 164 regulated facilities in Portola Valley, California, including 0 high-risk sites (0.0%), 0 active violators (0.0%), and 146 RCRA hazardous waste handlers (89.0%).
Which ZIP codes in Portola Valley, CA have the most EPA-tracked sites?
Within Portola Valley, regulated facilities are primarily concentrated across ZIP 94028 (184 sites).
How can I check a specific house or commercial property in Portola Valley, CA?
Enter the exact street address in Portola Valley 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 Portola Valley, CA and how many EPA water permits exist?
In Portola Valley, CA, federal registries track 1 Safe Drinking Water (SDWIS) facilities, 17 Clean Water Act NPDES permits, and 0 impaired water body dischargers.
What is the soil foundation risk and FEMA flood disaster history in Portola Valley, CA?
USDA regional soil screening for Portola Valley indicates a MODERATE shrink-swell foundation signal, and San Mateo County has recorded 4 federal FEMA disaster declarations (4 flood/severe storm declarations). Run an address scan to unlock exact parcel soil LEP %, water table depth, and flood zone.