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Clean Water Act discharge permit · NPDES MDG521009

PATUXENT RIVER OYSTER COMPANY, Mechanicsville, MD: NPDES MDG521009 discharge permit, effluent exceedances, inspections, penalties

PATUXENT RIVER OYSTER COMPANY holds NPDES permit MDG521009. EPA’s file records it issued December 4, 2000 and expiring August 27, 2005.

PATUXENT RIVER OYSTER COMPANY, Mechanicsville, Maryland: Coverage under a general permit MDG521009; Administratively continued (past its expiration date and still in force until reissued); issued December 4, 2000, term to August 27, 2005.

  • pH: 0 limits, 120 violations of any kind, 0 effluent exceedances.
  • Flow, in conduit or thru treatment plant: 0 limits, 120 violations of any kind, 0 effluent exceedances.
  • Solids, total suspended: 0 limits, 96 violations of any kind, 0 effluent exceedances.
  • Oil & Grease: 0 limits, 96 violations of any kind, 0 effluent exceedances.
  • Chlorine, total residual: 0 limits, 60 violations of any kind, 0 effluent exceedances.
  • Coliform, fecal general: 0 limits, 60 violations of any kind, 0 effluent exceedances.

PATUXENT RIVER OYSTER COMPANY among its neighbors

EPA’s permit file holds 8 discharge permits in the Indian Creek-Patuxent River subwatershed (HUC 020600060601), MDG521009 among them. Its county holds 46, 0 of them major permits; MDG521009 is a minor permit.

Other permits in the Indian Creek-Patuxent River subwatershed (HUC 020600060601)

  • C. A. BEAN, INC., Mechanicsville: MDG491651, minor permit, permit term to April 30, 2015
  • CAMP WINONA GIRL SCOUT CAMP, Hughesville: MD3573I07, minor permit, discharging to LOWER PATUXENT RIVER, permit term to December 31, 2025
  • CHARLOTTE HALL CONVENIENCE CENTER, Mechanicsville: MDR003778, minor permit, discharging to LOWER PATUXENT RIVER, permit term to January 31, 2028
  • MECHANICSVILLE RMC, Mechanicsville: MDG491091, minor permit, discharging to Lockes Swamp Creek via Lower Patuxent River, permit term to April 30, 2015
  • MULLYS BREWERY, Prince Frederick: MDR003730, minor permit, permit term to January 31, 2028
  • RUNNING HARE VINEYARD, Frederick: MDR003832, minor permit, permit term to January 21, 2031
  • SUPER SALVAGE, INC., Prince Frederick: MDR002414, minor permit, discharging to Unnamed Trib to Buzzard Island Creek, permit term to December 31, 2018

Identity

Facility as filedPATUXENT RIVER OYSTER COMPANY
Permittee as filedPATUXENT RIVER OYSTER COMPANY
NPDES IDMDG521009
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedDecember 4, 2000
Expiration dateAugust 27, 2005
AddressMechanicsville, MD 20659
SubwatershedIndian Creek-Patuxent River (HUC 020600060601)
SIC2092 – Fresh Or Frozen Prepared Fish

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
pH01200
Flow, in conduit or thru treatment plant01200
Solids, total suspended0960
Oil & Grease0960
Chlorine, total residual0600
Coliform, fecal general0600

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MDG521009.

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES MDG521009.

Inspections

EPA’s inspection file holds no inspection for NPDES MDG521009.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES MDG521009.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

What this page shows

The PATUXENT RIVER OYSTER COMPANY permit, MDG521009, is one of 42 general permit coverages in St. Mary's County, and only 7.1% of those carry an earlier issue date than this one. It sits among 8 NPDES permits in the Indian Creek-Patuxent River subwatershed, and 66.7% of the county's 42 general permit coverages have a violation on file, whereas this permit has none of the recorded pollutants under a numeric limit or with an effluent exceedance.