Montgomery County, Maryland — Flood Zone, Water Quality, Soil Foundation, Radon & EPA Hazards
In Montgomery County, Maryland, public U.S. EPA records track 3,733 regulated facilities (#2 of 50 in Maryland), including 45 (1.2%) High-Risk sites and $6,557,965 in federal penalties. Countywide due diligence also covers 64 Safe Drinking Water (SDWIS) facilities, 583 Clean Water NPDES permits, 1 FEMA Federal Disaster Declarations (0 flood/storm), USDA Soil Foundation Shrink-Swell (MODERATE signal), and EPA Zone 1 — High Potential (> 4.0 pCi/L).
Montgomery 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📊 Montgomery County, MD Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 01, 2026)Municipalities in Montgomery County
ZIP Codes in Montgomery County
Top EPA Regulated Facilities in Montgomery 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 • POTOMAC, MD (ZIP 20854 Sector) | HIGH (80/100) | Significant Violation (12 qtrs NC) | 🔒 $100,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • BETHESDA, MD (ZIP 20814 Sector) | HIGH (77/100) | Significant Violation (12 qtrs NC) | 🔒 $100,000+ Federal Fine • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • DICKERSON, MD (ZIP 20842 Sector) | HIGH (70/100) | Significant Violation (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • BETHESDA, MD (ZIP 20892 Sector) | HIGH (69/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • ROCKVILLE, MD (ZIP 20852 Sector) | HIGH (65/100) | Significant Violation (5 qtrs NC) | 🔒 5 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • ROCKVILLE, MD (ZIP 20850 Sector) | HIGH (65/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • BETHESDA, MD (ZIP 20817 Sector) | HIGH (65/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • GAITHERSBURG, MD (ZIP 20877 Sector) | HIGH (65/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| RENTAL TOOLS & EQUIPMENT CO INC FREE PREVIEW (LOW RISK) | 9710 CAPITOL VIEW AV, SILVER SPRING, MD 20910 | LOW (24/100) | No Violation Identified (0 qtrs NC) | $0 |
| RESEARCH COURT, 2 FREE PREVIEW (LOW RISK) | 2 RESEARCH COURT, ROCKVILLE, MD 20850 | LOW (19/100) | No Violation Identified (0 qtrs NC) | $0 |
| SAFEWAY STORE #4817 FREE PREVIEW (LOW RISK) | 116 UNIVERSITY BLVD, W, SILVER SPRING, MD 20901 | LOW (17/100) | No Violation Identified (0 qtrs NC) | $0 |
| M-0044 BIG WOODS ROAD OVER LITTLE MONOCACY RIVER FREE PREVIEW (LOW RISK) | BIG WOODS ROAD OVER LITTLE MONOCACY RIVER, DICKERSON, MD 20842 | LOW (15/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — Montgomery County, Maryland Environmental Due Diligence
How many EPA-regulated environmental sites are in Montgomery County, Maryland?
Public U.S. EPA records track 3,733 regulated facilities in Montgomery County, Maryland (ranking #2 of 50 jurisdictions in MD). Of those, 45 (1.2%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 67 (1.8%) have active non-compliance quarters.
Which ZIP codes and cities in Montgomery County have the highest regulated facility density?
Within Montgomery County, the highest concentrations of EPA-tracked facilities are located in ZIP 20850 (Rockville, 512 sites), ZIP 20910 (Silver Spring, 316 sites), ZIP 20852 (Rockville, 312 sites), spanning municipal corridors including Rockville (984 sites), Silver Spring (787 sites), Bethesda (378 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in Montgomery County?
Across Montgomery County, 2,187 facilities (58.6% 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 Montgomery County, MD?
Geologic indoor air screening places Montgomery 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 Montgomery County, MD?
Federal records track 64 Safe Drinking Water (SDWIS) facilities, 583 Clean Water Act NPDES permits, and 508 impaired water dischargers in Montgomery County, alongside 1 historical FEMA federal disaster declarations (0 flood/storm events).
Does Montgomery County, MD have expansive clay soil or foundation risk?
USDA regional soil engineering screening for Montgomery 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.