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 2,389 regulated facilities (#31 of 136 in California), including 24 (1.0%) High-Risk sites and $5,509,999 in federal penalties. Countywide due diligence also covers 198 Safe Drinking Water (SDWIS) facilities, 421 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 High-Risk EPA Enforcement Record #1 | 🔒 Exact Street & Parcel Redacted • NAPA, CA (ZIP 94558 Sector) | HIGH (91/100) | Significant Violation (12 qtrs NC) | 🔒 $10,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • SAINT HELENA, CA (ZIP 94574 Sector) | HIGH (75/100) | Significant Violation (12 qtrs NC) | 🔒 $100,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • NAPA, CA (ZIP 94558 Sector) | HIGH (72/100) | Significant Violation (12 qtrs NC) | 🔒 $10,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • SAINT HELENA, CA (ZIP 94574 Sector) | HIGH (66/100) | Significant Violation (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • CALISTOGA, CA (ZIP 94515 Sector) | HIGH (64/100) | Significant Violation (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • NAPA, CA (ZIP 94558 Sector) | MODERATE (43/100) | Violation Identified (7 qtrs NC) | 🔒 7 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • CALISTOGA, CA (ZIP 94515 Sector) | MODERATE (43/100) | Resolved / Historical Non-Compliance (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • SPANISH FLAT, CA (ZIP 94558 Sector) | MODERATE (41/100) | Violation Identified (7 qtrs NC) | 🔒 7 Qtrs Non-Compliance • Unlock → |
| OVID WINERY FREE PREVIEW (LOW RISK) | 255 LONG RANCH ROAD, SAINT HELENA, CA 94574 | LOW (19/100) | No Violation Identified (0 qtrs NC) | $0 |
| NAPA COUNTY SHERIFF'S OFFICE FREE PREVIEW (LOW RISK) | 1535 AIRPORT BLVD, NAPA, CA 94558 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| BERINGER VINEYARDS FREE PREVIEW (LOW RISK) | , , CA | LOW (13/100) | No Violation Identified (0 qtrs NC) | $0 |
| STERLING VINEYARDS FREE PREVIEW (LOW RISK) | , , CA | LOW (13/100) | 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, California?
Public U.S. EPA records track 2,389 regulated facilities in Napa County, California (ranking #31 of 136 jurisdictions in CA). Of those, 24 (1.0%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 42 (1.8%) have active non-compliance quarters.
Which ZIP codes and cities in Napa County have the highest regulated facility density?
Within Napa County, the highest concentrations of EPA-tracked facilities are located in ZIP 94559 (Napa, 509 sites), ZIP 94574 (Saint Helena, 432 sites), ZIP 94503 (American Canyon, 253 sites), spanning municipal corridors including Saint Helena (385 sites), American Canyon (272 sites), Calistoga (236 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Napa County?
Across Napa County, 2,080 facilities (87.1% 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, CA?
Geologic indoor air screening places Napa 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, CA?
Federal records track 198 Safe Drinking Water (SDWIS) facilities, 421 Clean Water Act NPDES permits, and 78 impaired water dischargers in Napa 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.