Clean Water Act discharge permit · NPDES VAG840095

LOUDOUN QUARRIES, Sterling, VA: NPDES VAG840095 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
3Pollutants under a numeric limit
1Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

LOUDOUN QUARRIES, held by Loudoun Quarries, holds NPDES permit VAG840095, which discharges to Horsepen Run. EPA’s file records it issued July 1, 2019 and expiring June 30, 2024.

LOUDOUN QUARRIES, Sterling, Virginia: Coverage under a general permit VAG840095, held by Loudoun Quarries; Administratively continued (past its expiration date and still in force until reissued); issued July 1, 2019, term to June 30, 2024, by VA DEQ; discharges to Horsepen Run; Other Crushed and Broken Stone Mining and Quarrying.

Solids, total suspended: 4 limits, 8 violations of any kind, 8 effluent exceedances, latest March 31, 2026, largest 30% over the limit.
pH: 4 limits, 0 violations of any kind, 0 effluent exceedances.
Flow, in conduit or thru treatment plant: 4 limits, 0 violations of any kind, 0 effluent exceedances.

LOUDOUN QUARRIES among its neighbors

EPA’s permit file holds 62 discharge permits in the Horsepen Run subwatershed (HUC 020700080902), VAG840095 among them. Its county holds 64, 2 of them major permits; VAG840095 is a minor permit.

Other permits in the Horsepen Run subwatershed (HUC 020700080902)

13100 & 13150 WORLDGATE DRIVE, Va: VAR10W895, minor permit, discharging to Horsepen Run, permit term to June 30, 2029
1700 SOUTH STERLING BOULEVARD, Sterling: VAR10V537, minor permit, discharging to Horsepen Run, permit term to June 30, 2029
22675 DULLES SUMMIT COURT, Sterling: VAR10T042, minor permit, discharging to Horsepen Run, permit term to June 30, 2024
ARPINA VALLEY, Herndon: VAR10V127, minor permit, discharging to Horsepen Run, permit term to June 30, 2029
AURORA STATION AT DULLES, Herndon: VAR10W928, minor permit, discharging to Horsepen Run, permit term to June 30, 2029
CENTREVILLE RD TO MONROE ST, Fairfax: VAR10V045, minor permit, discharging to Horsepen Run, permit term to June 30, 2029
CFA WOODLAND PARK, Herndon: VAR10N610, minor permit, discharging to Horsepen Run, permit term to June 30, 2024
CHANDON PARK TRAIL IMPROVEMENTS, Herndon: VAR10N093, minor permit, discharging to Horsepen Run, permit term to June 30, 2024
CONCOURSE A-B SE APRON & TLE 1 RECONSTRUCTION, Dulles: VAR10T618, minor permit, discharging to Horsepen Run, permit term to June 30, 2024
CONSTRUCT NEW TAXILANES W&W3 AND RECONSTRUCT TAXIL, Dulles: VAR10W904, minor permit, discharging to Horsepen Run, permit term to June 30, 2029

Identity

Facility as filed	LOUDOUN QUARRIES
Permittee as filed	Loudoun Quarries
NPDES ID	VAG840095
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	July 1, 2019
Expiration date	June 30, 2024
Issuing agency	VA DEQ
Address	Sterling, VA 20166
Receiving water	Horsepen Run
Receiving water impaired	303(D) Listed
Subwatershed	Horsepen Run (HUC 020700080902)
NAICS	212319 – Other Crushed and Broken Stone Mining and Quarrying
SIC	1429 – Crushed And Broken Stone

Effluent limits and exceedances

3Pollutants on file
3Under a numeric limit
1With a violation of any kind
1With an effluent exceedance

An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Solids, total suspended	4	8	8	March 31, 2026	30% over the limit
pH	4	0	0
Flow, in conduit or thru treatment plant	4	0	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES VAG840095.

Inspections

EPA’s inspection file holds no inspection for NPDES VAG840095.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES VAG840095.

Watch this permit

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

This public-records page covers Clean Water Act discharge permit NPDES VAG840095 for LOUDOUN QUARRIES in Sterling, VA, which discharges to Horsepen Run and is administratively continued. The register lists 1 pollutant under a numeric limit and 1 pollutant with an effluent exceedance, with the permit recorded as issued July 1, 2019 and expiring June 30, 2024.