Clean Water Act discharge permit · NPDES MDG679630
ADVANCED TECHNOLOGY LABORATORIES (ATL), Linthicum, MD: NPDES MDG679630 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 7Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
ADVANCED TECHNOLOGY LABORATORIES (ATL), held by NORTHROP GRUMMAN SYSTEMS CORPORATION, holds NPDES permit MDG679630, which discharges to Stony Run And Patapsco River. EPA’s file records it issued June 15, 2017 and expiring June 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 | ADVANCED TECHNOLOGY LABORATORIES (ATL) |
|---|---|
| Permittee as filed | NORTHROP GRUMMAN SYSTEMS CORPORATION |
| NPDES ID | MDG679630 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | June 15, 2017 |
| Expiration date | June 30, 2022 |
| Issuing agency | MARYLAND DEPARTMENT OF THE ENVIRONMENT |
| Address | Linthicum, MD 21090 |
| Receiving water | STONY RUN AND PATAPSCO RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Herbert Run-Patapsco River (HUC 020600031103) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 7Pollutants on file
- 7Under a numeric limit
- 7With a violation of any kind
- 0With 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 | 4 | 38 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 38 | 0 | ||
| Oxygen, dissolved [DO] | 2 | 19 | 0 | ||
| Solids, total suspended | 2 | 19 | 0 | ||
| Oil & Grease | 2 | 19 | 0 | ||
| Chlorine, total residual | 2 | 19 | 0 | ||
| Flow, total | 2 | 19 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MDG679630.
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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MDG679630.
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.
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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 MDG679630 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.