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 19 regulated facilities (#120 of 136 in California), including 0 (0.0%) High-Risk sites and $0 in federal penalties. Countywide due diligence also covers 1 Safe Drinking Water (SDWIS) facilities, 11 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 05, 2026)Municipalities in Mariposa County
ZIP Codes 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 Regulated EPA Enforcement Record #1 | 🔒 Exact Street & Parcel Redacted • MARIPOSA, CA (ZIP 95338 Sector) | MODERATE (32/100) | Resolved / Historical Non-Compliance (3 qtrs NC) | 🔒 3 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • WAWONA, CA (ZIP 95389 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (2 qtrs NC) | 🔒 2 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • MARIPOSA, CA (ZIP 95538 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (2 qtrs NC) | 🔒 2 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • MARIPOSA, CA (ZIP 95338 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (3 qtrs NC) | 🔒 3 Qtrs Non-Compliance • Unlock → |
| YOSEMITE VILLAGE GARAGE FREE PREVIEW (LOW RISK) | 9002 VILLAGE DR, YOSEMITE NATIONAL PARK, CA 95389 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| VILLAGE STORE FREE PREVIEW (LOW RISK) | 9011 VILLAGE DR, YOSEMITE NATIONAL PARK, CA 95389 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| LOST ARROW DORMS FREE PREVIEW (LOW RISK) | 9021 VILLAGE DR, YOSEMITE NATIONAL PARK, CA 95389 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| INDIAN CREEK APARTMENTS FREE PREVIEW (LOW RISK) | 9004 VILLAGE DR, YOSEMITE NATIONAL PARK, CA 95389 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • YOSEMITE NATIONAL PARK, CA (ZIP 95389 Sector) | LOW (15/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • YOSEMITE NATIONAL PARK, CA (ZIP 95389 Sector) | LOW (15/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • YOSEMITE NATIONAL PARK, CA (ZIP 95389 Sector) | LOW (15/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • EL PORTAL, CA (ZIP 98318 Sector) | LOW (13/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
Frequently Asked Questions — Mariposa County, California Environmental Due Diligence
How many EPA-regulated environmental sites are in Mariposa County County, California?
Public U.S. EPA records track 19 regulated facilities in Mariposa County County, California (ranking #120 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 2 (10.5%) have active non-compliance quarters.
Which ZIP codes and cities in Mariposa County County have the highest regulated facility density?
Within Mariposa County County, the highest concentrations of EPA-tracked facilities are located in ZIP 95325 (Hornitos, 3 sites), ZIP 95538 (Mariposa, 3 sites), ZIP 98318 (El Portal, 1 sites), spanning municipal corridors including Yosemite National Park (26 sites), Hornitos (3 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Mariposa County County?
Across Mariposa County County, 7 facilities (36.8% 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 Mariposa County County, CA?
Geologic indoor air screening places Mariposa County 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 County, CA?
Federal records track 1 Safe Drinking Water (SDWIS) facilities, 11 Clean Water Act NPDES permits, and 0 impaired water dischargers in Mariposa County 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.