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General Warehousing And Storage, Hampstead, Maryland. NPDES permit MD0001881, in force until Aug 31, 2030. Last 12 months: over a limit 11 times (last February 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Nitrogen, ammonia total [as N], maximum monthly average | 4.3 mg/L | ≤ 1.8 mg/L | 139% |
| December 2025 | Nitrogen, ammonia total [as N], maximum daily average | 7.5 mg/L | ≤ 4.1 mg/L | 83% |
| January 2026 | E. coli, maximum monthly geometric mean | 68 MPN/100mL | ≤ 60 MPN/100mL | 13% |
| January 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 14.1 lb/d | ≤ 9 lb/d | 57% |
| January 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 8.1 mg/L | ≤ 1.8 mg/L | 350% |
| January 2026 | Nitrogen, ammonia total [as N], maximum daily average | 13.1 mg/L | ≤ 4.1 mg/L | 220% |
| January 2026 | Nitrogen, ammonia total [as N], maximum daily average | 23.7 lb/d | ≤ 21 lb/d | 13% |
| February 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 13.2 lb/d | ≤ 9 lb/d | 47% |
| February 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 7.8 mg/L | ≤ 1.8 mg/L | 333% |
| February 2026 | Nitrogen, ammonia total [as N], maximum daily average | 20.3 mg/L | ≤ 4.1 mg/L | 395% |
| February 2026 | Nitrogen, ammonia total [as N], maximum daily average | 34.2 lb/d | ≤ 21 lb/d | 63% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | May–Sep | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | May–Sep | 001 |
| Temperature, water deg. fahrenheit | weekly average | report only (deg F) | May–Sep | 001 |
| Temperature, water deg. fahrenheit | weekly average | report only (deg F) | May–Sep | 001 |
| Temperature, water deg. fahrenheit | daily average | report only (deg F) | May–Sep | 001 |
| Temperature, water deg. fahrenheit | daily average | report only (deg F) | May–Sep | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 15 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 15 mg/L | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 20 mg/L | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 20 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 001 |
| Oil & Grease | maximum monthly average | ≤ 10 mg/L | all year | 001 |
| Oil & Grease | maximum monthly average | ≤ 10 mg/L | all year | 001 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 001 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 001 |
| Phosphorus, total [as P] | maximum monthly average | ≤ .3 mg/L | all year | 001 |
| Phosphorus, total [as P] | maximum monthly average | ≤ .3 mg/L | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | maximum monthly average | ≤ 11 ug/L | all year | 001 |
| Chlorine, total residual | maximum monthly average | ≤ 11 ug/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 19 ug/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 19 ug/L | all year | 001 |
| PER-AND POLYFLUOROALKYL SUBSTANCES | daily maximum | report only (ng/L) | all year | 001 |
| PER-AND POLYFLUOROALKYL SUBSTANCES | daily maximum | report only (ng/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (gal/d) | all year | 101 |
| Flow, in conduit or thru treatment plant | monthly average | report only (gal/d) | all year | 101 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (gal/d) | all year | 101 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (gal/d) | all year | 101 |
| E. coli | maximum weekly average | ≤ 126 MPN/100mL | all year | 101 |
| E. coli | maximum weekly average | ≤ 126 MPN/100mL | all year | 101 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | May–Sep | 102 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | May–Sep | 102 |
| Temperature, water deg. fahrenheit | weekly average | report only (deg F) | May–Sep | 102 |
| Temperature, water deg. fahrenheit | weekly average | report only (deg F) | May–Sep | 102 |
| Temperature, water deg. fahrenheit | daily average | report only (deg F) | May–Sep | 102 |
| Temperature, water deg. fahrenheit | daily average | report only (deg F) | May–Sep | 102 |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | all year | 102 |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | all year | 102 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | all year | 102 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | all year | 102 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 225 lb/d | all year | 102 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 225 lb/d | all year | 102 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | all year | 102 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | all year | 102 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 150 lb/d | all year | 102 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 150 lb/d | all year | 102 |
| pH | minimum | ≥ 6.5 SU | all year | 102 |
| pH | minimum | ≥ 6.5 SU | all year | 102 |
| pH | maximum | ≤ 8.5 SU | all year | 102 |
| pH | maximum | ≤ 8.5 SU | all year | 102 |
| Solids, total suspended | maximum weekly average | ≤ 23 mg/L | all year | 102 |
| Solids, total suspended | maximum weekly average | ≤ 23 mg/L | all year | 102 |
| Solids, total suspended | maximum weekly average | ≤ 113 lb/d | all year | 102 |
| Solids, total suspended | maximum weekly average | ≤ 113 lb/d | all year | 102 |
| Solids, total suspended | cumulative total | ≤ 27397 lb/yr | all year | 102 |
| Solids, total suspended | cumulative total | ≤ 27397 lb/yr | all year | 102 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 102 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 102 |
| Solids, total suspended | maximum monthly average | ≤ 15 mg/L | all year | 102 |
| Solids, total suspended | maximum monthly average | ≤ 15 mg/L | all year | 102 |
| Solids, total suspended | maximum monthly average | ≤ 75 lb/d | all year | 102 |
| Solids, total suspended | maximum monthly average | ≤ 75 lb/d | all year | 102 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 102 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 102 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 102 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 102 |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | all year | 102 |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | all year | 102 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 102 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 102 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 3.56 mg/L | May–Sep | 102 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 3.56 mg/L | May–Sep | 102 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 4.1 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 102 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 4.1 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 102 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 17.8 lb/d | May–Sep | 102 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 17.8 lb/d | May–Sep | 102 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 21 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 102 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 21 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 102 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ .77 mg/L | May–Sep | 102 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ .77 mg/L | May–Sep | 102 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 3.8 lb/d | May–Sep | 102 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 3.8 lb/d | May–Sep | 102 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 1.1 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 102 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 1.1 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 102 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 5.5 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 102 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 5.5 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 102 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 102 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 102 |
| Phosphorus, total [as P] | maximum weekly average | ≤ .45 mg/L | all year | 102 |
| Phosphorus, total [as P] | maximum weekly average | ≤ .45 mg/L | all year | 102 |
| Phosphorus, total [as P] | maximum weekly average | ≤ 2.3 lb/d | all year | 102 |
| Phosphorus, total [as P] | maximum weekly average | ≤ 2.3 lb/d | all year | 102 |
| Phosphorus, total [as P] | cumulative total | ≤ 548 lb/yr | all year | 102 |
| Phosphorus, total [as P] | cumulative total | ≤ 548 lb/yr | all year | 102 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 102 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 102 |
| Phosphorus, total [as P] | maximum monthly average | ≤ .3 mg/L | all year | 102 |
| Phosphorus, total [as P] | maximum monthly average | ≤ .3 mg/L | all year | 102 |
| Phosphorus, total [as P] | maximum monthly average | ≤ 1.5 lb/d | all year | 102 |
| Phosphorus, total [as P] | maximum monthly average | ≤ 1.5 lb/d | all year | 102 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 102 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 102 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 102 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 102 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 102 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 102 |
| E. coli | maximum monthly geometric mean | ≤ 60 MPN/100mL | all year | 102 |
| E. coli | maximum monthly geometric mean | ≤ 60 MPN/100mL | all year | 102 |
| E. coli | monthly maximum | report only (MPN/100mL) | all year | 102 |
| E. coli | monthly maximum | report only (MPN/100mL) | all year | 102 |
| PER-AND POLYFLUOROALKYL SUBSTANCES | daily maximum | report only (ng/L) | all year | 102 |
| PER-AND POLYFLUOROALKYL SUBSTANCES | daily maximum | report only (ng/L) | all year | 102 |
| Flow, total | monthly average | report only (MGD) | all year | 102 |
| Flow, total | monthly average | report only (MGD) | all year | 102 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 102 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 102 |
| Flow, total | daily maximum | report only (MGD) | all year | 102 |
| Flow, total | daily maximum | report only (MGD) | all year | 102 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | May–Sep | 201 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | May–Sep | 201 |
| Temperature, water deg. fahrenheit | weekly average | report only (deg F) | May–Sep | 201 |
| Temperature, water deg. fahrenheit | weekly average | report only (deg F) | May–Sep | 201 |
| Temperature, water deg. fahrenheit | daily average | report only (deg F) | May–Sep | 201 |
| Temperature, water deg. fahrenheit | daily average | report only (deg F) | May–Sep | 201 |
| 1,1,1-Trichloroethane | monthly average | report only (ug/L) | all year | 201 |
| 1,1,1-Trichloroethane | monthly average | report only (ug/L) | all year | 201 |
| 1,1,1-Trichloroethane | daily maximum | ≤ 5 ug/L | all year | 201 |
| 1,1,1-Trichloroethane | daily maximum | ≤ 5 ug/L | all year | 201 |
| PER-AND POLYFLUOROALKYL SUBSTANCES | daily maximum | report only (ng/L) | all year | 201 |
| PER-AND POLYFLUOROALKYL SUBSTANCES | daily maximum | report only (ng/L) | all year | 201 |
| PER-AND POLYFLUOROALKYL SUBSTANCES | daily maximum | report only (ng/L) | all year | 201 |
| PER-AND POLYFLUOROALKYL SUBSTANCES | daily maximum | report only (ng/L) | all year | 201 |
| Flow | monthly average | report only (MGD) | all year | 201 |
| Flow | monthly average | report only (MGD) | all year | 201 |
| Flow | monthly average | report only (MGD) | all year | 201 |
| Flow | monthly average | report only (MGD) | all year | 201 |
| Flow | daily maximum | report only (MGD) | all year | 201 |
| Flow | daily maximum | report only (MGD) | all year | 201 |
| Flow | daily maximum | report only (MGD) | all year | 201 |
| Flow | daily maximum | report only (MGD) | all year | 201 |
| Organics, tot purgeables [Method 624] | monthly average | report only (ug/L) | all year | 201 |
| Organics, tot purgeables [Method 624] | monthly average | report only (ug/L) | all year | 201 |
| Organics, tot purgeables [Method 624] | daily maximum | ≤ 100 ug/L | all year | 201 |
| Organics, tot purgeables [Method 624] | daily maximum | ≤ 100 ug/L | all year | 201 |
| Tetrachloroethene | monthly average | report only (ug/L) | all year | 201 |
| Tetrachloroethene | monthly average | report only (ug/L) | all year | 201 |
| Tetrachloroethene | daily maximum | ≤ 5 ug/L | all year | 201 |
| Tetrachloroethene | daily maximum | ≤ 5 ug/L | all year | 201 |
| Trichloroethene | monthly average | report only (ug/L) | all year | 201 |
| Trichloroethene | monthly average | report only (ug/L) | all year | 201 |
| Trichloroethene | daily maximum | ≤ 5 ug/L | all year | 201 |
| Trichloroethene | daily maximum | ≤ 5 ug/L | all year | 201 |
Cited limits by parameter: Maryland's rules and the federal ones.
Same industry: the 5 Motor Freight Transportation and Warehousing permits in Maryland.
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