St. Mary's County, MD
The federal environmental record for St. Mary's County (population 115,281): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
2
Superfund NPL sites
3
federal cleanup sites
0
PFAS-detecting water systems
2
TRI facilities
0
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| Patuxent River Naval Air Station | St. Mary's County | on the NPL | 05/31/1994 |
| Southern Maryland Wood Treating | Hollywood | deleted | 06/10/1986 |
Drinking water: PFAS testing
No public water system serving St. Mary's reported a PFAS detection in the UCMR5 national testing round. Systems serving under 3,300 people were only sampled in part, so absence from this table is not proof of absence in the water.
Facilities reporting toxic releases (2024)
2 facilities in St. Mary's filed TRI reports for 2024, totalling 1 lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| US NAVAL AIR STATION PATUXENT RIVER | PATUXENT RIVER | Lead | 1 lb |
| SMO MECHANICSVILLE PLANT | MECHANICSVILLE | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 297 tank facilities in St. Mary's: 162 tanks in service and 903 closed. 323 fuel releases are on record, of which 0 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps St. Mary's as Zone 2, moderate predicted indoor radon (2 to 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 St. Mary's, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- NAS WEBSTER FIELD ANNEXSAINT INIGOES
- PATUXENT RIVER NAVAL AIR STATIONPATUXENT RIVER
- SOUTHERN MARYLAND WOOD TREATINGHOLLYWOOD