Clean Water Act discharge permit · NPDES VA0089541
MWAA - WASHINGTON DULLES INTERNATIONAL AIRPORT, Sterling, VA: NPDES VA0089541 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 18Pollutants under a numeric limit
- 1Pollutants with an effluent exceedance
MWAA - WASHINGTON DULLES INTERNATIONAL AIRPORT, held by Metropolitan Washington Airports Authority, holds NPDES permit VA0089541, which discharges to Horsepen Run. EPA’s file records it issued December 1, 2017 and expiring November 30, 2022. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | MWAA - WASHINGTON DULLES INTERNATIONAL AIRPORT |
|---|---|
| Permittee as filed | Metropolitan Washington Airports Authority |
| NPDES ID | VA0089541 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | December 1, 2017 |
| Expiration date | November 30, 2022 |
| Issuing agency | VA DEQ |
| Address | Sterling, VA 20166 |
| Receiving water | Horsepen Run |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Horsepen Run (HUC 020700080902) |
| NAICS | 488190 – Other Support Activities for Air Transportation |
| SIC | 4581 – Airports, Flying Fields, & Services |
| Other EPA IDs (FRS) | RCRA handler VA6690500909; ICIS-AIR source VA0000005110700074 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 19Pollutants on file
- 18Under a numeric limit
- 10With 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 |
|---|---|---|---|---|---|
| pH | 18 | 54 | 24 | March 31, 2024 | |
| Flow, in conduit or thru treatment plant | 18 | 30 | 0 | ||
| Petrol hydrocarbons, total recoverable | 18 | 24 | 0 | ||
| Solids, total suspended | 18 | 23 | 0 | ||
| Potassium, total [as K] | 4 | 18 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 6 | 7 | 0 | ||
| Oxygen, dissolved [DO] | 12 | 6 | 0 | ||
| BOD, 5-day, 20 deg. C | 12 | 6 | 0 | ||
| Oxygen demand, chem. [low level] [COD] | 12 | 6 | 0 | ||
| Conductivity | 0 | 6 | 0 | ||
| Specific conductance | 16 | 0 | 0 | ||
| 1,2-Propanediol | 12 | 0 | 0 | ||
| Nitrogen, total [as N] | 6 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 6 | 0 | 0 | ||
| Phosphorus, total [as P] | 6 | 0 | 0 | ||
| Chloride [as Cl] | 4 | 0 | 0 | ||
| Sulfate, total [as SO4] | 4 | 0 | 0 | ||
| Solids, total dissolved | 4 | 0 | 0 | ||
| Sodium, total [as Na] | 4 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 24, 2017 | Effluent Violations - Unapproved Bypass | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID VA0089541 there.
Nearby on the register
- Discharge permits in Sterling
- Every permit record in Sterling, A to Z
- Discharge permits in Virginia
- Every permit record in Virginia, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.