Loudoun County, VA
The federal environmental record for Loudoun County (population 436,347): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
1
Superfund NPL sites
1
federal cleanup sites
4
PFAS-detecting water systems
13
TRI facilities
3
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| Hidden Lane Landfill | Sterling | on the NPL | 03/19/2008 |
Drinking water: PFAS testing
Public water systems serving Loudoun 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 |
|---|---|---|
| HAMILTON, TOWN OF VA6107150 | PFOA: 6.1 ng/L PFBS: 6 ng/L PFOS: 4.6 ng/L | above final limit |
| PURCELLVILLE, TOWN OF VA6107600 | PFPeA: 46.6 ng/L PFHxA: 26.2 ng/L 6:2 FTS: 17.9 ng/L | above final limit |
| ROUND HILL, TOWN OF VA6107650 | PFOS: 8.8 ng/L PFBS: 8.3 ng/L PFOA: 5.6 ng/L | above final limit |
| LOUDOUN WATER - CENTRAL SYSTEM VA6107350 | PFPeA: 3.4 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
13 facilities in Loudoun filed TRI reports for 2024, totalling 9k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| TTM TECHNOLOGIES N.A. LLC. | DULLES | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Copper And Copper Compounds | 4k lb |
| VIRGINIA CONCRETE DULLES PLANT | STERLING | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Lead | 2k lb |
| MENZIES AVIATION FUELING OPERATIONS WASH DULLES INTERNATIONA | STERLING | Methyl tert-butyl ether, Toluene | 2k lb |
| VIRGINIA CONCRETE CO INC-CHANTILLY | CHANTILLY | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Lead | 850 lb |
| VIRGINIA CONCRETE BULL RUN | CHANTILLY | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Lead | 532 lb |
| DOWTY A GE AEROSPACE CO | STERLING | Lead | 223 lb |
| VIRGINIA CONCRETE COCHRAN MILL | LEESBURG | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Lead | 178 lb |
| TITAN VIRGINIA READY-MIX LLC-STERLING PLANT | STERLING | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Lead | 116 lb |
| TITAN VIRGINIA READY-MIX LLC-LEESBURG PLANT | LEESBURG | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Lead And Lead Compounds | 46 lb |
| CHANTILLY READY MIX CONCRETE | CHANTILLY | Mercury And Mercury Compounds, Lead And Lead Compounds | 2 lb |
| US DHS MT WEATHER EOC | BLUEMONT | Lead compounds | 1 lb |
| VIRGINIA PAVING CO - CHANTILLY PLANT | CHANTILLY | Polycyclic aromatic compounds | 1 lb |
| ELECTRONIC INSTRUMENTATION & TECHNOLOGY LLC | LEESBURG | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 404 tank facilities in Loudoun: 417 tanks in service and 836 closed. 293 fuel releases are on record, of which 3 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Loudoun 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 Loudoun, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- HIDDEN LANE LANDFILLSTERLING