Mariposa County, California — Property Hazard, Flood Zone, Soil, Water & EPA Guide
What Are the Flood, Soil Foundation & EPA Risks in Mariposa County, CA?
In Mariposa County, California, public U.S. EPA records track 267 regulated facilities (#70 of 136 in California), including 7 (2.6%) High-Risk sites and $0 in federal penalties. Countywide due diligence also covers 70 Safe Drinking Water (SDWIS) facilities, 19 Clean Water NPDES permits, 6 FEMA Federal Disaster Declarations (4 flood/storm), USDA Soil Foundation Shrink-Swell (MODERATE signal), and EPA Zone 1 — High Potential (> 4.0 pCi/L).
Mariposa 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📊 Mariposa County, CA Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 03, 2026)Municipalities in Mariposa County
Top EPA Regulated Facilities in Mariposa 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 • MARIPOSA, CA (ZIP 95338 Sector) | HIGH (64/100) | Significant Violation (3 qtrs NC) | 🔒 3 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • EL PORTAL, CA (ZIP 95318 Sector) | MODERATE (54/100) | Violation Identified (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • YOSEMITE NATIONAL PARK, CA (ZIP 95389 Sector) | MODERATE (44/100) | Violation Identified (7 qtrs NC) | 🔒 7 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • MARIPOSA, CA (ZIP 95338 Sector) | MODERATE (38/100) | Resolved / Historical Non-Compliance (7 qtrs NC) | 🔒 7 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • LA GRANGE, CA (ZIP 95329 Sector) | MODERATE (36/100) | Violation Identified (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • MIDPINES, CA (ZIP 95345 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • BEAR VALLEY, CA (ZIP 95223 Sector) | MODERATE (34/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • MARIPOSA, CA (ZIP 95338 Sector) | MODERATE (33/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| CA DEPT OF TRANSPORTATION FREE PREVIEW (LOW RISK) | US 395 PM 92, BRIDGEPORT, CA 93517 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| PACIFIC BELL TELEPHONE COMPANY FREE PREVIEW (LOW RISK) | 5013 EL PORTAL RD, YOSEMITE, CA 95389 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| LONS BODY SHOP FREE PREVIEW (LOW RISK) | OLD HIWAY & HIWAY 49 SO, MARIPOSA, CA 95338 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| KEN NABORS TRUCKING FREE PREVIEW (LOW RISK) | 4581 JEANNINE, MARIPOSA, CA 95338 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — Mariposa County, California Environmental Due Diligence
How many EPA-regulated environmental sites are in Mariposa County, California?
Public U.S. EPA records track 267 regulated facilities in Mariposa County, California (ranking #70 of 136 jurisdictions in CA). Of those, 7 (2.6%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 8 (3.0%) have active non-compliance quarters.
Which ZIP codes and cities in Mariposa County have the highest regulated facility density?
Within Mariposa County, the highest concentrations of EPA-tracked facilities are located in ZIP 95338 (Mariposa, 129 sites), ZIP 95389 (Yosemite National Pa, 63 sites), ZIP 93517 (Bridgeport, 39 sites), spanning municipal corridors including Mariposa (131 sites), Bridgeport (41 sites), Bear Valley (19 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Mariposa County?
Across Mariposa County, 191 facilities (71.5% 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 Mariposa County, CA?
Geologic indoor air screening places Mariposa County in EPA Zone 1 — High Potential (> 4.0 pCi/L). Counties in EPA Radon Zone 1 have a predicted average indoor radon screening level greater than 4.0 pCi/L (the EPA action threshold). Short-term or continuous indoor radon testing is strongly recommended prior to closing.
How many drinking water systems (SDWIS), impaired water bodies, and FEMA flood disasters are recorded in Mariposa County, CA?
Federal records track 70 Safe Drinking Water (SDWIS) facilities, 19 Clean Water Act NPDES permits, and 2 impaired water dischargers in Mariposa County, alongside 6 historical FEMA federal disaster declarations (4 flood/storm events).
Does Mariposa County, CA have expansive clay soil or foundation risk?
USDA regional soil engineering screening for Mariposa County indicates a MODERATE shrink-swell risk signal and steel pipe corrosivity rated Low. Run a street address scan to unlock the exact parcel soil series, LEP %, and water table depth.