Clean Water Act discharge permit · NPDES MD0021091
NATIONAL SEASHORE ASSATEAQUE, Berlin, MD: NPDES MD0021091 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 14Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
NATIONAL SEASHORE ASSATEAQUE, held by National Park Service, Assateague Island National Seashore, holds NPDES permit MD0021091, which discharges to Sinepuxent Bay. EPA’s file records it issued August 17, 2011 and expiring September 30, 2016. 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 | NATIONAL SEASHORE ASSATEAQUE |
|---|---|
| Permittee as filed | National Park Service, Assateague Island National Seashore |
| NPDES ID | MD0021091 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Federal facility |
| Issued | August 17, 2011 |
| Expiration date | September 30, 2016 |
| Issuing agency | Maryland Department of The Environment |
| Address | Berlin, MD 21811 |
| Receiving water | SINEPUXENT BAY |
| Subwatershed | Sinepuxent Bay (HUC 020403030402) |
| SIC | 9512 – Land, Mineral, Wildlife Conservation |
| Other EPA IDs (FRS) | RCRA handler MD3141719846 |
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
- 15Pollutants on file
- 14Under a numeric limit
- 14With a violation of any kind
- 6With 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 |
|---|---|---|---|---|---|
| Nitrogen, total [as N] | 4 | 136 | 127 | July 31, 2021 | 1,610% over the limit |
| Phosphorus, total [as P] | 4 | 140 | 91 | May 31, 2026 | 267,800% over the limit |
| BOD, 5-day, 20 deg. C | 4 | 42 | 27 | April 30, 2017 | 584% over the limit |
| Solids, total suspended | 4 | 33 | 18 | March 31, 2026 | 1,550% over the limit |
| pH | 2 | 14 | 6 | May 31, 2026 | |
| Oxygen, dissolved [DO] | 1 | 8 | 4 | June 30, 2024 | 100% over the limit |
| Phosphorous, in total orthophosphate | 0 | 44 | 0 | ||
| Chlorine, total residual | 1 | 35 | 0 | ||
| Nitrogen, organic total [as N] | 1 | 16 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 15 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 13 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 11 | 0 | ||
| Coliform, fecal general | 1 | 5 | 0 | ||
| Flow, total | 1 | 4 | 0 | ||
| Phosphate, ortho [as P] | 1 | 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 MD0021091.
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 MD0021091 there.
Nearby on the register
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- Every permit record in Berlin, A to Z
- Discharge permits in Maryland
- Every permit record in Maryland, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.