Clean Water Act discharge permit · NPDES MD0002640
GENON - DICKERSON GENERATING, Dickerson, MD: NPDES MD0002640 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 30Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
GENON - DICKERSON GENERATING, held by Mirant Mid-Atlantic, LLC, holds NPDES permit MD0002640, which discharges to Steam And Combustion Turbine. EPA’s file records it issued November 1, 2009 and expiring October 31, 2014. 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 | GENON - DICKERSON GENERATING |
|---|---|
| Permittee as filed | Mirant Mid-Atlantic, LLC |
| NPDES ID | MD0002640 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | November 1, 2009 |
| Expiration date | October 31, 2014 |
| Issuing agency | MDE |
| Address | Dickerson, MD 20842 |
| Receiving water | STEAM AND COMBUSTION TURBINE |
| Subwatershed | Little Monocacy River (HUC 020700080402) |
| SIC | 4911 – Electric Services |
| Other EPA IDs (FRS) | RCRA handler MDD000731596; ICIS-AIR source MD0000002403101746 |
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
- 35Pollutants on file
- 30Under a numeric limit
- 16With a violation of any kind
- 9With 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 |
|---|---|---|---|---|---|
| Thermal Discharge | 1 | 51 | 51 | October 31, 2001 | 98,358% over the limit |
| Nitrogen, total [as N] | 23 | 7 | 7 | December 31, 2017 | 1,789% over the limit |
| pH | 2 | 7 | 7 | September 30, 2019 | |
| Solids, total suspended | 10 | 8 | 6 | August 31, 2022 | 121% over the limit |
| Coliform, fecal general | 0 | 5 | 5 | February 29, 2004 | 4,150% over the limit |
| Oxidants, total residual | 2 | 6 | 4 | September 30, 2009 | 809% over the limit |
| Phosphorus, total [as P] | 23 | 3 | 3 | December 31, 2017 | 32% over the limit |
| Oil and grease, hexane extr method | 0 | 2 | 2 | May 31, 2004 | 600% over the limit |
| Temperature Increase Deg. F | 0 | 1 | 1 | January 31, 2019 | 4% over the limit |
| Bromide [as Br] | 0 | 24 | 0 | ||
| Flow, in conduit or thru treatment plant | 12 | 20 | 0 | ||
| BOD, 5-day, 20 deg. C | 6 | 10 | 0 | ||
| Hydrocarbons, petroleum | 0 | 9 | 0 | ||
| Copper, total [as Cu] | 3 | 2 | 0 | ||
| Mercury, total [as Hg] | 2 | 2 | 0 | ||
| Iron, total [as Fe] | 1 | 1 | 0 | ||
| Oil & Grease | 6 | 0 | 0 | ||
| Temperature, water deg. fahrenheit | 2 | 0 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 0 | 0 | ||
| Fluoride | 2 | 0 | 0 | ||
| Arsenic, total [as As] | 2 | 0 | 0 | ||
| Beryllium, total [as Be] | 2 | 0 | 0 | ||
| Cadmium, total [as Cd] | 2 | 0 | 0 | ||
| Lead, total [as Pb] | 2 | 0 | 0 | ||
| Thallium, total [as Tl] | 2 | 0 | 0 | ||
| Nickel, total [as Ni] | 2 | 0 | 0 | ||
| Silver, total [as Ag] | 2 | 0 | 0 | ||
| Zinc, total [as Zn] | 2 | 0 | 0 | ||
| Antimony, total [as Sb] | 2 | 0 | 0 | ||
| Aluminum, total [as Al] | 2 | 0 | 0 | ||
| Selenium, total [as Se] | 2 | 0 | 0 | ||
| Chloride | 2 | 0 | 0 | ||
| Temp. diff. between intake and discharge | 2 | 0 | 0 | ||
| Sulfate | 2 | 0 | 0 | ||
| E. coli | 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 MD0002640.
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 MD0002640 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 October 14, 2026.