Napa County, California — Property Hazard, Flood Zone, Soil, Water & EPA Guide
What Are the Flood, Soil Foundation & EPA Risks in Napa County, CA?
In Napa County, California, public U.S. EPA records track 241 regulated facilities (#73 of 136 in California), including 0 (0.0%) High-Risk sites and $0 in federal penalties. Countywide due diligence also covers 0 Safe Drinking Water (SDWIS) facilities, 238 Clean Water NPDES permits, 4 FEMA Federal Disaster Declarations (4 flood/storm), USDA Soil Foundation Shrink-Swell (LOW signal), and EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L).
Napa County, CA 6-in-1 Flood, Soil Foundation, Tap Water & Radon Signals
🔒 Parcel-Level Soil LEP %, Water Table Depth & Flood Zone Require Street Address Scan📊 Napa County, CA Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 05, 2026)Municipalities in Napa County
ZIP Codes in Napa County
Top EPA Regulated Facilities in Napa County, 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 • NAPA, CA (ZIP 94558 Sector) | MODERATE (36/100) | Resolved / Historical Non-Compliance (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • SAINT HELENA, CA (ZIP 94574 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • NAPA, CA (ZIP 94558 Sector) | MODERATE (33/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • AMERICAN CANYON, CA (ZIP 94503 Sector) | MODERATE (32/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • NAPA, CA (ZIP 94558 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • SAINT HELENA, CA (ZIP 94574 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • SAINT HELENA, CA (ZIP 94574 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • NAPA, CA (ZIP 94558 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| DARIOUSH WINERY, LLC FREE PREVIEW (LOW RISK) | 4240 SILVERADO TRAIL, NAPA, CA 94558 | LOW (25/100) | No Violation Identified (0 qtrs NC) | $0 |
| CHATEAU MONTELENA FREE PREVIEW (LOW RISK) | 1429 TUBBS LANE, CALISTOGA, CA 94515 | LOW (24/100) | No Violation Identified (0 qtrs NC) | $0 |
| OPUS ONE WINERY LLC FREE PREVIEW (LOW RISK) | 7900 SAINT HELENA HIGHWAY, OAKVILLE, CA 94562 | LOW (24/100) | No Violation Identified (0 qtrs NC) | $0 |
| A WINE VALLEY EXPERINCE LIMOUSINE INC DBA NAPA VALLEY TOURS & TRANSPORTATION FREE PREVIEW (LOW RISK) | 933 WATER ST, NAPA, CA 94559 | LOW (24/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — Napa County, California Environmental Due Diligence
How many EPA-regulated environmental sites are in Napa County County, California?
Public U.S. EPA records track 241 regulated facilities in Napa County County, California (ranking #73 of 136 jurisdictions in CA). Of those, 0 (0.0%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 3 (1.2%) have active non-compliance quarters.
Which ZIP codes and cities in Napa County County have the highest regulated facility density?
Within Napa County County, the highest concentrations of EPA-tracked facilities are located in ZIP 94558 (Napa, 1,200 sites), spanning municipal corridors including Napa (1,723 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Napa County County?
Across Napa County County, 14 facilities (5.8% of regulated sites) are registered Resource Conservation and Recovery Act (RCRA) hazardous waste generators or handlers, and 0 industrial sites report toxic chemical releases to the EPA Toxics Release Inventory (TRI).
What is the EPA Radon Zone classification for Napa County County, CA?
Geologic indoor air screening places Napa County County in EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L). Counties in EPA Radon Zone 2 have a predicted average indoor radon level between 2.0 and 4.0 pCi/L. Testing basement or ground-floor living areas is recommended during home inspection.
How many drinking water systems (SDWIS), impaired water bodies, and FEMA flood disasters are recorded in Napa County County, CA?
Federal records track 0 Safe Drinking Water (SDWIS) facilities, 238 Clean Water Act NPDES permits, and 34 impaired water dischargers in Napa County County, alongside 4 historical FEMA federal disaster declarations (4 flood/storm events).
Does Napa County, CA have expansive clay soil or foundation risk?
USDA regional soil engineering screening for Napa County indicates a LOW shrink-swell risk signal and steel pipe corrosivity rated Moderate. Run a street address scan to unlock the exact parcel soil series, LEP %, and water table depth.