Tuolumne County, California — Property Hazard, Flood Zone, Soil, Water & EPA Guide
What Are the Flood, Soil Foundation & EPA Risks in Tuolumne County, CA?
In Tuolumne County, California, public U.S. EPA records track 34 regulated facilities (#111 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, 32 Clean Water NPDES permits, 4 FEMA Federal Disaster Declarations (3 flood/storm), USDA Soil Foundation Shrink-Swell (HIGH signal), and EPA Zone 1 — High Potential (> 4.0 pCi/L).
Tuolumne 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📊 Tuolumne County, CA Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 05, 2026)Municipalities in Tuolumne County
ZIP Codes in Tuolumne County
Top EPA Regulated Facilities in Tuolumne 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 • SONORA, CA (ZIP 95370 Sector) | MODERATE (40/100) | Resolved / Historical Non-Compliance (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • SONORA, CA (ZIP 95370 Sector) | MODERATE (30/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • SONORA, CA (ZIP 95370 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (3 qtrs NC) | 🔒 3 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • JAMESTOWN, CA (ZIP 95327 Sector) | MODERATE (30/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| TWAIN HARTE MIDDLE SCH FREE PREVIEW (LOW RISK) | 18815 MANZANITA CT, TWAIN HARTE, CA 95383 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| TREAT ENTERPRISES, INC. FREE PREVIEW (LOW RISK) | 19401 RAWHIDE RD, SONORA, CA 95370 | LOW (15/100) | No Violation Identified (0 qtrs NC) | $0 |
| TUOLOMNE U.D. REGIONAL WWTP FREE PREVIEW (LOW RISK) | 18885 NUGGET BLVD, SONORA, CA 95370 | LOW (13/100) | No Violation Identified (0 qtrs NC) | $0 |
| JAMESTOWN MINE FREE PREVIEW (LOW RISK) | 17855 HIGH SCHOOL RD, JAMESTOWN, CA 94801 | LOW (13/100) | No Violation Identified (0 qtrs NC) | $0 |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • JAMESTOWN, CA (ZIP 95327 Sector) | LOW (13/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • GROVELAND, CA (ZIP 95321 Sector) | LOW (12/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • GROVELAND, CA (ZIP 95321 Sector) | LOW (12/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • SONORA, CA (ZIP 95370 Sector) | LOW (12/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
Frequently Asked Questions — Tuolumne County, California Environmental Due Diligence
How many EPA-regulated environmental sites are in Tuolumne County County, California?
Public U.S. EPA records track 34 regulated facilities in Tuolumne County County, California (ranking #111 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 0 (0.0%) have active non-compliance quarters.
Which ZIP codes and cities in Tuolumne County County have the highest regulated facility density?
Within Tuolumne County County, the highest concentrations of EPA-tracked facilities are located in local postal sectors, spanning municipal corridors including Tuolumne County.
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Tuolumne County County?
Across Tuolumne County County, 2 facilities (5.9% 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 Tuolumne County County, CA?
Geologic indoor air screening places Tuolumne 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 Tuolumne County County, CA?
Federal records track 0 Safe Drinking Water (SDWIS) facilities, 32 Clean Water Act NPDES permits, and 1 impaired water dischargers in Tuolumne County County, alongside 4 historical FEMA federal disaster declarations (3 flood/storm events).
Does Tuolumne County, CA have expansive clay soil or foundation risk?
USDA regional soil engineering screening for Tuolumne County indicates a HIGH shrink-swell risk signal and steel pipe corrosivity rated High. Run a street address scan to unlock the exact parcel soil series, LEP %, and water table depth.