Mariposa County, California — Property Hazard, Flood Zone, Soil, Water & Market Guide
What Are the Major Property, Flood, Soil & Environmental Risks in Mariposa County, CA?
Public U.S. EPA records track 1 regulated facilities in Mariposa County, California (Mariposa County), including 0 High-Risk sites (0.0%) and 0 active violators. In addition to industrial waste, Mariposa County properties are screened for Tap Water & Watershed Permits (1 systems), USDA Soil Foundation Shrink-Swell (MODERATE signal), 6 County FEMA Disaster Declarations, 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)ZIP Codes in Mariposa County, CA
Highest-Scored 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 |
|---|---|---|---|---|
| WAWONA WWTF FREE PREVIEW (LOW RISK) | 4004 CHILNUALNA FALLS ROAD, MARIPOSA COUNTY, CA 95389 | LOW (12/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — Mariposa County, California Environmental Risk & Radon
How many EPA-regulated facilities are in Mariposa County, CA?
U.S. EPA records track 1 regulated facilities in Mariposa County, California, including 0 high-risk sites (0.0%), 0 active violators (0.0%), and 0 RCRA hazardous waste handlers (0.0%).
Which ZIP codes in Mariposa County, CA have the most EPA-tracked sites?
Within Mariposa County, regulated facilities are primarily concentrated across local postal codes.
How can I check a specific house or commercial property in Mariposa County, CA?
Enter the exact street address in Mariposa County 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 Mariposa County, CA and how many EPA water permits exist?
In Mariposa County, CA, federal registries track 0 Safe Drinking Water (SDWIS) facilities, 1 Clean Water Act NPDES permits, and 0 impaired water body dischargers.
What is the soil foundation risk and FEMA flood disaster history in Mariposa County, CA?
USDA regional soil screening for Mariposa County indicates a MODERATE shrink-swell foundation signal, and Mariposa County has recorded 6 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.