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 840 regulated facilities (#47 of 136 in California), including 8 (1.0%) High-Risk sites and $0 in federal penalties. Countywide due diligence also covers 133 Safe Drinking Water (SDWIS) facilities, 53 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 High-Risk EPA Enforcement Record #1 | 🔒 Exact Street & Parcel Redacted • JAMESTOWN, CA (ZIP 60525 Sector) | HIGH (64/100) | Significant Violation (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • SOULSBYVILLE, CA (ZIP 95372 Sector) | MODERATE (39/100) | Violation Identified (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • YOSEMITE NATIONAL PARK, CA (ZIP 95389 Sector) | MODERATE (36/100) | Violation Identified (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • JAMESTOWN, CA (ZIP 95327 Sector) | MODERATE (34/100) | Violation Identified (7 qtrs NC) | 🔒 7 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • YOSEMITE NATIONAL PARK, CA (ZIP 95389 Sector) | MODERATE (33/100) | Violation Identified (4 qtrs NC) | 🔒 4 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • TWAIN HARTE, CA (ZIP 95383 Sector) | MODERATE (33/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • SONORA, CA (ZIP 95370 Sector) | MODERATE (32/100) | No Violation Identified (0 qtrs NC) | 🔒 Active Permit Dossier • Unlock → |
| 🔒 Locked Regulated EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • TIBURON, CA (ZIP 94920 Sector) | MODERATE (30/100) | Resolved / Historical Non-Compliance (4 qtrs NC) | 🔒 4 Qtrs Non-Compliance • Unlock → |
| GOLD RUSH PRINTING FREE PREVIEW (LOW RISK) | 14405 TUOLUMNE, SONORA, CA 95370 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| MOUNTAIN SPRINGS GOLF COURSE INC FREE PREVIEW (LOW RISK) | 17566 LIMEKILN RD, SONORA, CA 95370 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| SONORA COMMUNITY HOSPITAL FREE PREVIEW (LOW RISK) | 1 S FOREST RD, SONORA, CA 95370 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
| PHI AIR MEDICAL LLC FREE PREVIEW (LOW RISK) | 10713 AIRPORT RD, COLUMBIA, CA 95310 | LOW (16/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — Tuolumne County, California Environmental Due Diligence
How many EPA-regulated environmental sites are in Tuolumne County, California?
Public U.S. EPA records track 840 regulated facilities in Tuolumne County, California (ranking #47 of 136 jurisdictions in CA). Of those, 8 (1.0%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 15 (1.8%) have active non-compliance quarters.
Which ZIP codes and cities in Tuolumne County have the highest regulated facility density?
Within Tuolumne County, the highest concentrations of EPA-tracked facilities are located in ZIP 95370 (Sonora, 444 sites), ZIP 95327 (Jamestown, 120 sites), ZIP 95321 (Groveland, 61 sites), spanning municipal corridors including Sonora (437 sites), Jamestown (120 sites), Groveland (57 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Tuolumne County?
Across Tuolumne County, 683 facilities (81.3% 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, CA?
Geologic indoor air screening places Tuolumne 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, CA?
Federal records track 133 Safe Drinking Water (SDWIS) facilities, 53 Clean Water Act NPDES permits, and 3 impaired water dischargers in Tuolumne 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.