St. Mary'S County, Maryland — Flood Zone, Water Quality, Soil Foundation, Radon & EPA Hazards
In St. Mary'S County, Maryland, public U.S. EPA records track 368 regulated facilities (#23 of 50 in Maryland), including 21 (5.7%) High-Risk sites and $2,600 in federal penalties. Countywide due diligence also covers 210 Safe Drinking Water (SDWIS) facilities, 160 Clean Water NPDES permits, 2 FEMA Federal Disaster Declarations (1 flood/storm), USDA Soil Foundation Shrink-Swell (MODERATE signal), and EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L).
St. Mary'S County, MD 6-in-1 Flood, Soil Foundation, Tap Water & Radon Signals
🔒 Parcel-Level Soil LEP %, Water Table Depth & Flood Zone Require Street Address Scan📊 St. Mary'S County, MD Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 01, 2026)Municipalities in St. Mary'S County
ZIP Codes in St. Mary'S County
Top EPA Regulated Facilities in St. Mary'S County, MD
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 • CHARLOTTE HALL, MD (ZIP 20622 Sector) | HIGH (68/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • MECHANICSVILLE, MD (ZIP 20659 Sector) | HIGH (64/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • RIDGE, MD (ZIP 20680 Sector) | HIGH (64/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • CALIFORNIA, MD (ZIP 20619 Sector) | HIGH (64/100) | Significant Violation (8 qtrs NC) | 🔒 8 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • ST MARY'S CITY, MD (ZIP 20689 Sector) | HIGH (64/100) | Significant Violation (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • CALIFORNIA, MD (ZIP 20619 Sector) | HIGH (64/100) | Significant Violation (8 qtrs NC) | 🔒 8 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • COMPTON, MD (ZIP 20657 Sector) | HIGH (64/100) | Significant Violation (5 qtrs NC) | 🔒 5 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • TALL TIMBERS, MD (ZIP 20690 Sector) | HIGH (64/100) | Significant Violation (5 qtrs NC) | 🔒 5 Qtrs Non-Compliance • Unlock → |
| MARGARET BRENT MIDDLE SCHOOL FREE PREVIEW (LOW RISK) | 29675 POINT LOOKOUT ROAD, HELEN, MD 20635 | LOW (19/100) | No Violation Identified (0 qtrs NC) | $0 |
| BUZZ'S MARINA, LLC. FREE PREVIEW (LOW RISK) | 49675 BUZZ'S MARINA WAY, RIDGE, MD 20680 | LOW (17/100) | Unknown (0 qtrs NC) | $0 |
| COLTONS POINT MARINA FREE PREVIEW (LOW RISK) | 38000 KOPELS ROAD, COLATON POINT, MD 20626 | LOW (17/100) | Unknown (0 qtrs NC) | $0 |
| POWER HOUSE APOSTOLIC MINISTRY FREE PREVIEW (LOW RISK) | , , MD 20653 | LOW (10/100) | Inactive (0 qtrs NC) | $0 |
Frequently Asked Questions — St. Mary'S County, Maryland Environmental Due Diligence
How many EPA-regulated environmental sites are in St. Mary'S County, Maryland?
Public U.S. EPA records track 368 regulated facilities in St. Mary'S County, Maryland (ranking #23 of 50 jurisdictions in MD). Of those, 21 (5.7%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 27 (7.3%) have active non-compliance quarters.
Which ZIP codes and cities in St. Mary'S County have the highest regulated facility density?
Within St. Mary'S County, the highest concentrations of EPA-tracked facilities are located in ZIP 20659 (Mechanicsville, 83 sites), ZIP 20653 (Lexington Park, 81 sites), ZIP 20636 (Hollywood, 66 sites), spanning municipal corridors including Lexington Park (72 sites), Mechanicsville (55 sites), Hollywood (49 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in St. Mary'S County?
Across St. Mary'S County, 7 facilities (1.9% 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 St. Mary'S County, MD?
Geologic indoor air screening places St. Mary'S County in EPA Zone 2 — Moderate Potential (2.0 – 4.0 pCi/L). Counties in EPA Radon Zone 2 have a predicted average indoor radon level between 2.0 and 4.0 pCi/L. Testing basement or ground-floor living areas is recommended during home inspection.
How many drinking water systems (SDWIS), impaired water bodies, and FEMA flood disasters are recorded in St. Mary'S County, MD?
Federal records track 210 Safe Drinking Water (SDWIS) facilities, 160 Clean Water Act NPDES permits, and 79 impaired water dischargers in St. Mary'S County, alongside 2 historical FEMA federal disaster declarations (1 flood/storm events).
Does St. Mary'S County, MD have expansive clay soil or foundation risk?
USDA regional soil engineering screening for St. Mary'S County indicates a MODERATE shrink-swell risk signal and steel pipe corrosivity rated Moderate. Run a street address scan to unlock the exact parcel soil series, LEP %, and water table depth.