Clean Water Act discharge permit · NPDES MD0071757
PLYMOUTH TUNNEL, Silver Spring, MD: NPDES MD0071757 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 10Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
PLYMOUTH TUNNEL, held by MARYLAND TRANSIT ADMINISTRATION, holds NPDES permit MD0071757, which discharges to Anacostia River. EPA’s file records it issued April 30, 2015 and expiring May 31, 2020. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | PLYMOUTH TUNNEL |
|---|---|
| Permittee as filed | MARYLAND TRANSIT ADMINISTRATION |
| NPDES ID | MD0071757 |
| 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 | April 30, 2015 |
| Expiration date | May 31, 2020 |
| Issuing agency | Maryland Department of The Environment |
| Address | Silver Spring, MD 20901 |
| Receiving water | ANACOSTIA RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Henson Creek (HUC 020700100303) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 10Pollutants on file
- 10Under a numeric limit
- 2With a violation of any kind
- 2With 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 | 8 | 27 | 27 | May 31, 2025 | 483% over the limit |
| pH | 8 | 18 | 18 | March 31, 2025 | |
| Hardness, total [as CaCO3] | 8 | 0 | 0 | ||
| Copper, total [as Cu] | 8 | 0 | 0 | ||
| Lead, total [as Pb] | 8 | 0 | 0 | ||
| Nickel, total [as Ni] | 8 | 0 | 0 | ||
| Silver, total [as Ag] | 8 | 0 | 0 | ||
| Zinc, total [as Zn] | 8 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 0 | 0 | ||
| Flow | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MD0071757.
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 MD0071757 there.
Nearby on the register
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- Every permit record in Maryland, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.