Montgomery County, MD
The federal environmental record for Montgomery County (population 1,058,474): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
17
federal cleanup sites
3
PFAS-detecting water systems
7
TRI facilities
6
open tank releases
Drinking water: PFAS testing
Public water systems serving Montgomery with at least one PFAS detection under UCMR5. The federal limit for PFOA and PFOS is 4 ng/L; EPA proposed in May 2026 to rescind the limits for the other compounds, which are shown for information.
| System | Highest results | Reading |
|---|---|---|
| TOWN OF POOLESVILLE MD0150002 | PFPeA: 15.1 ng/L PFHxA: 9.8 ng/L PFBA: 8.9 ng/L | above final limit |
| CITY OF ROCKVILLE MD0150003 | PFPeA: 6.5 ng/L PFHxA: 5.8 ng/L PFBA: 5.2 ng/L | detected |
| WASHINGTON SUBURBAN SANITARY COMMISSION MD0150005 | PFPeA: 6.7 ng/L PFHxA: 4.8 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
7 facilities in Montgomery filed TRI reports for 2024, totalling 2k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| U.S. PUBLIC HEALTH SERVICE NATIONAL INSTITUTES OF HEALTH | BETHESDA | Lead, Polychlorinated biphenyls | 2k lb |
| WABTEC RAILWAY ELECTRONICS | GERMANTOWN | Lead And Lead Compounds | 74 lb |
| LAFARGE MID ATLANTIC LLC -ROCKVILLE EAST CONCRETE | ROCKVILLE | Mercury And Mercury Compounds, Lead And Lead Compounds | 1 lb |
| SCHUSTER CONCRETE READY MIX LLC-SOUTHLAWN LN | ROCKVILLE | Lead | 0 lb |
| GRIFFITH ENERGY SERVICES - DAMASCUS FUELS PLANT | DAMASCUS | - | 0 lb |
| NATIONAL INSTITUTE OF STANDARDS & TECHNOLOGY | GAITHERSBURG | - | 0 lb |
| NEUTRON PRODUCTS INC. | DICKERSON | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 1,238 tank facilities in Montgomery: 931 tanks in service and 3,642 closed. 1,624 fuel releases are on record, of which 6 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Montgomery as Zone 1, the highest predicted indoor radon levels (over 4 pCi/L average). Radon and air quality are covered in depth on lung.com.
The record for one specific address
County figures blur what matters: distance. The Address Environmental Report runs these same federal datasets against one address and reports every site, tank, polluter and water result around it, with distances, in about a minute.
Get the report - $39All federal cleanup sites on file
The wider Superfund enterprise inventory (SEMS) for Montgomery, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- CARDEROCK DIVISION NAVAL SURFACE WARFARE CENTERBETHESDA
- FEDERAL STREET MERCURYROCKVILLE
- GAITHERSBURG - CONTROLGAITHERSBURG
- GSA - WHITE OAK RESEARCH CENTERSILVER SPRING
- LAYTONSVILLE-LAUNCHGAITHERSBURG
- NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGYGAITHERSBURG
- NEUTRON PRODS INCDICKERSON
- NGA - BETHESDABETHESDA
- NIH ANIMAL CTRPOOLESVILLE
- NIH CHEM GENOMICS CTRROCKVILLE
- ROCKVILLE - CONTROLGAITHERSBURG
- ROCKVILLE - LAUNCHGAITHERSBURG
- SILVER SPRING RESIDENTIAL MERCURYSILVER SPRING
- UNIFORMED SERVICE UNIVERSITY OF HEALTH SCIENCES/CNRMBETHESDA
- US PUBLIC HEALTH SERVICE NATIONAL INSTITUTES OF HEALTHBETHESDA
- WALTER REED ARMY MEDICAL CENTER FOREST GLEN ANNEXSILVER SPRING
- WELLER'S CLEANERSSILVER SPRING