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Sewage treatment plant, major discharger, Baltimore County, Maryland. NPDES permit MD0021555 expired Apr 30, 2023; its limits still apply. Last 12 months: over a limit 4 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| February 2026 | 001 | Chlorine, total residual, maximum | .22 mg/L | ≤ .1 mg/L | 120% |
| February 2026 | 001 | Phosphorus, total [as P], maximum weekly average | 390 lb/d | ≤ 330 lb/d | 18% |
| February 2026 | 002 | Phosphorus, total [as P], weekly average | .85 mg/L | ≤ .3 mg/L | 183% |
| June 2026 | 001 | Toxicity, Chronic, maximum | 2.3 tox chronic | < 1.02 tox chronic | 125% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | minimum weekly average | > 6 mg/L | Feb–May | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 10 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 15 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 11000 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 16000 lb/d | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 10 mg/L | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 15 mg/L | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 11000 lb/d | all year | 001 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 16000 lb/d | all year | 001 |
| Solids, total suspended | cumulative total | ≤ 3959228 lb/yr | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | cumulative total | ≤ 1582055 lb/yr | all year | 001 |
| Nitrogen, total [as N] | monthly total | ≤ 99782 lb/mo | May–Oct | 001 |
| Nitrogen, total [as N] | annual total | report only (lb/yr) | Dec | 001 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 5.1 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 2 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 3 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 5229 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 2200 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 3300 lb/d | May–Oct | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | maximum monthly average | ≤ .2 mg/L | all year | 001 |
| Phosphorus, total [as P] | maximum weekly average | ≤ .3 mg/L | all year | 001 |
| Phosphorus, total [as P] | maximum monthly average | ≤ 220 lb/d | all year | 001 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Phosphorus, total [as P] | maximum weekly average | ≤ 330 lb/d | all year | 001 |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | Mar, Jun, Sep, Dec | 001 |
| Phosphorus, total [as P] | cumulative total | ≤ 79277 lb/yr | all year | 001 |
| Phosphorus, total [as P] | monthly total | ≤ 6652 lb/mo | May–Oct | 001 |
| Cyanide, free [amenable to chlorination] | monthly average | report only (ug/L) | all year | 001 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 001 |
| Chlordane [tech mix. and metabolites] | total | report only (ug/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 | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | maximum | ≤ .1 mg/L | all year | 001 |
| E. coli | maximum monthly geometric mean | ≤ 126 MPN/100mL | all year | 001 |
| Chromium, hexavalent tot recoverable | value | report only (mg/L) | all year | 001 |
| Polychlorinated biphenyls [PCB] pg/L | quarterly average | report only (ng/L) | Mar, Jun, Sep, Dec | 001 |
| Polychlorinated biphenyls [PCB] pg/L | annual average | report only (ng/L) | Mar, Jun, Sep, Dec | 001 |
| Polychlorinated biphenyls [PCB] pg/L | quarterly average | report only (g/qtr) | Mar, Jun, Sep, Dec | 001 |
| Polychlorinated biphenyls [PCB] pg/L | annual maximum | report only (g/yr) | Mar, Jun, Sep, Dec | 001 |
| Flow, total | annual total | report only (Mgal/yr) | Mar, Jun, Sep, Dec | 001 |
| Flow, total | total | report only (Mgal/mo) | all year | 001 |
| Toxicity, Acute | maximum | < 1 tox acute | Mar, Jun, Sep, Dec | 001 |
| Toxicity, Chronic | maximum | < 1.02 tox chronic | Mar, Jun, Sep, Dec | 001 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 002 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 6 mg/L | Feb–May | 002 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 20 mg/L | May–Oct | 002 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 30 mg/L | May–Oct | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 8340 lb/d | May–Oct | 002 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 12520 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 12520 lb/d | May–Oct | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 18770 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 8.5 SU | all year | 002 |
| Solids, total suspended | maximum monthly average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | maximum monthly average | ≤ 12520 lb/d | all year | 002 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 002 |
| Solids, total suspended | maximum weekly average | ≤ 18770 lb/d | all year | 002 |
| Solids, total suspended | cumulative total | ≤ 4589026 lb/yr | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | EPA's "SEAS TDT" | ≤ 230294 lb/yr | May–Oct | 002 |
| Nitrogen, total [as N] | cumulative total | ≤ 610748 lb/yr | all year | 002 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 002 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, organic total [as N] | monthly load | report only (lb/d) | all year | 002 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 5.1 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 2 mg/L | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 3 mg/L | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 2130 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 830 lb/d | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 1250 lb/d | May–Oct | 002 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | monthly load | report only (lb/d) | all year | 002 |
| Phosphorus, total [as P] | monthly average | ≤ .2 mg/L | all year | 002 |
| Phosphorus, total [as P] | weekly average | ≤ .3 mg/L | all year | 002 |
| Phosphorus, total [as P] | monthly average | ≤ 83 lb/d | all year | 002 |
| Phosphorus, total [as P] | total | report only (lb/mo) | all year | 002 |
| Phosphorus, total [as P] | cumulative total | ≤ 30363 lb/yr | all year | 002 |
| Phosphorus, total [as P] | weekly average | ≤ 125 lb/d | all year | 002 |
| Phosphorus, total [as P] | EPA's "SEAS TDT" | ≤ 15353 lb/yr | May–Oct | 002 |
| Cyanide, free [amenable to chlorination] | monthly average | report only (ug/L) | all year | 002 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 002 |
| Phosphate, ortho [as P] | monthly load | report only (lb/d) | all year | 002 |
| Chlordane [tech mix. and metabolites] | total | report only (ug/L) | all year | 002 |
| Endrin | total | report only (ug/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | maximum | report only (mg/L) | all year | 002 |
| E. coli | maximum monthly geometric mean | ≤ 126 MPN/100mL | all year | 002 |
| Chromium, hexavalent tot recoverable | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 002 |
| Polychlorinated biphenyls [PCB] pg/L | quarterly average | report only (ng/L) | Mar, Jun, Sep, Dec | 002 |
| Polychlorinated biphenyls [PCB] pg/L | annual average | report only (ng/L) | Mar, Jun, Sep, Dec | 002 |
| Polychlorinated biphenyls [PCB] pg/L | quarterly average | report only (g/qtr) | Mar, Jun, Sep, Dec | 002 |
| Polychlorinated biphenyls [PCB] pg/L | annual total | report only (g/yr) | Mar, Jun, Sep, Dec | 002 |
| Flow, total | total | report only (Mgal/mo) | all year | 002 |
Cited limits by parameter: Maryland's rules and the federal ones.
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