Clean Water Act discharge permit · NPDES MDG499739

GUILFORD PLANT, Jessup, MD: NPDES MDG499739 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
4Pollutants under a numeric limit
1Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

GUILFORD PLANT, held by SCHUSTER PORTABLE PLANT # 6, holds NPDES permit MDG499739, which discharges to Back River. EPA’s file records it issued December 20, 2010 and expiring April 30, 2015.

GUILFORD PLANT, Jessup, Maryland: Coverage under a general permit MDG499739, held by SCHUSTER PORTABLE PLANT # 6; Administratively continued (past its expiration date and still in force until reissued); issued December 20, 2010, term to April 30, 2015, by Maryland Department of the Environment; discharges to BACK RIVER.

Solids, total suspended: 4 limits, 41 violations of any kind, 4 effluent exceedances, latest September 30, 2023, largest 113% over the limit.
pH: 4 limits, 40 violations of any kind, 0 effluent exceedances.
Flow, in conduit or thru treatment plant: 4 limits, 39 violations of any kind, 0 effluent exceedances.
pH change [range]: 4 limits, 32 violations of any kind, 0 effluent exceedances.
Oil and grease: 0 limits, 2 violations of any kind, 0 effluent exceedances.

GUILFORD PLANT among its neighbors

EPA’s permit file holds 44 discharge permits in the Dorsey Run-Little Patuxent River subwatershed (HUC 020600060202), MDG499739 among them. Its county holds 77, 0 of them major permits; MDG499739 is a minor permit.

Other permits in the Dorsey Run-Little Patuxent River subwatershed (HUC 020600060202)

9035 NE JUNCTION DRIVE, Annapolis: MDR003770, minor permit, discharging to LITTLE PATUXENT RIVER, permit term to January 31, 2028
ACELL INTEGRA, INC., Columbia: MDR003649, minor permit, permit term to December 31, 2026
ALLAN MYERS MATERIALS - JESSUP PLANT, Jessup: MDG492110, minor permit, permit term to April 1, 2014
AMERICAN WOOD FIBERS, Jessup: MDR003454, minor permit, discharging to LITTLE PATUXENT RIVER, permit term to December 31, 2024
ANNAPOLIS JUNCTION, Annapolis Junction: MDG498018, minor permit, discharging to Little Patuxent River, permit term to April 30, 2015
ATHOLTON SWIM CLUB, Columbia: MDG767270, minor permit, discharging to UNAMED TRIBUTARY TO LITTLE PATUXENT RIVER, permit term to January 31, 2028
BIOENERGY DEVO, LLC MFCA, Jessup: MDR003657, minor permit, permit term to December 31, 2026
CHEF'S WAREHOUSE MID-ATLANTIC, LLC DBA CAPITAL SEABOARD, Jessup: MDG5201NA, minor permit, permit term to October 30, 2027
COLUMBIA SWIM CENTER MAIN POOL, Columbia: MDG766171, minor permit, discharging to LITTLE PATUXENT RIVER, permit term to January 31, 2028
DASHER GREEN POOL, Columbia: MDG766172, minor permit, discharging to LITTLE PATUXENT RIVER, permit term to January 31, 2028

Identity

Facility as filed	GUILFORD PLANT
Permittee as filed	SCHUSTER PORTABLE PLANT # 6
NPDES ID	MDG499739
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	December 20, 2010
Expiration date	April 30, 2015
Issuing agency	Maryland Department of the Environment
Address	Jessup, MD 20794
Receiving water	BACK RIVER
Receiving water impaired	303(D) Listed
Subwatershed	Dorsey Run-Little Patuxent River (HUC 020600060202)

Effluent limits and exceedances

5Pollutants on file
4Under a numeric limit
5With a violation of any kind
1With 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	4	41	4	September 30, 2023	113% over the limit
pH	4	40	0
Flow, in conduit or thru treatment plant	4	39	0
pH change [range]	4	32	0
Oil and grease	0	2	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES MDG499739.

Inspections

EPA’s inspection file holds no inspection for NPDES MDG499739.

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 MDG499739.

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Nearby on the register

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

This public-records page covers Clean Water Act discharge permit NPDES MDG499739 for the GUILFORD PLANT in Jessup, MD, held by SCHUSTER PORTABLE PLANT # 6, which discharges to BACK RIVER. The permit is listed as administratively continued, with a minor discharger class of 4, one pollutant under a numeric limit, and one pollutant with an effluent exceedance.