Clean Water Act discharge permit · NPDES MDG520500

MADHOUSE OYSTER, LLC, Fishing Creek, MD: NPDES MDG520500 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
7Pollutants under a numeric limit
0Pollutants with an effluent exceedance

MADHOUSE OYSTER, LLC, held by Madhouse Oysters, LLC, holds NPDES permit MDG520500. EPA’s file records it issued April 1, 2023 and expiring October 31, 2027. 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	MADHOUSE OYSTER, LLC
Permittee as filed	Madhouse Oysters, LLC
NPDES ID	MDG520500
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	April 1, 2023
Expiration date	October 31, 2027
Issuing agency	MDE
Address	Fishing Creek, MD 21634
Subwatershed	Fox Creek-Honga River (HUC 020600050603)

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
pH	2	78
Solids, total suspended	2	78
Oil and grease	2	78
Flow, in conduit or thru treatment plant	2	78
Production, seafood effluent	1	39
Chlorine, total residual	1	39
Coliform, fecal general	1	39

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MDG520500.

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 MDG520500.

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 MDG520500 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

This public-records page covers NPDES permit MDG520500, held by Madhouse Oysters, LLC for MADHOUSE OYSTER, LLC at Fishing Creek, MD, under Effective permit status, with the permit issued April 1, 2023 and expiring October 31, 2027. The page lists 7 pollutants on file, 7 of them under a numeric limit and 7 with a violation of any kind, with 0 pollutants showing an effluent exceedance. The facility is in the Fox Creek-Honga River subwatershed (HUC 020600050603), and the status reflects EPA's permit file as loaded on September 15, 2026.