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Sewage treatment plant, major discharger, Anne Arundel, Maryland. NPDES permit MD0021661, in force until Jul 31, 2031. Last 12 months: over a limit 2 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | pH, maximum | 9 SU | ≤ 8.5 SU | — |
| August 2026 | Chlorine, total residual, instantaneous maximum | < .1 mg/L | < .039 mg/L | 156% |
| 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 | monthly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 3755 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 5633 lb/d | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 3755 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 5633 lb/d | all year | 001 |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | all year | 001 |
| Nitrogen, total [as N] | annual total | report only (lb/yr) | all year | 001 |
| Nitrogen, total [as N] | annual total | report only (lb/yr) | all year | 001 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | Dec | 001 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 463 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 1163 lb/d | May–Oct | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | all year | 001 |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | all year | 001 |
| Benzo[a]pyrene | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Dibenz[a,h]anthracene | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Aldrin | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Dieldrin | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Toxaphene | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Hexachlorobenzene | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 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 | monthly average | report only (MGD) | all year | 001 |
| Chlorine, total residual | instantaneous maximum | < .039 mg/L | all year | 001 |
| Enterococci | maximum monthly geometric mean | ≤ 35 MPN/100mL | all year | 001 |
| Phosphorous, in total orthophosphate | monthly average | report only (mg/L) | all year | 001 |
| Polychlorinated biphenyls [PCB] pg/L | quarterly average | report only (pg/L) | Mar, Jun, Sep, Dec | 001 |
| Polychlorinated biphenyls [PCB] pg/L | quarterly average | report only (g/qtr) | Mar, Jun, Sep, Dec | 001 |
| BOD, 5-day, percent removal | monthly average | report only (%) | all year | 001 |
| Solids, suspended percent removal | monthly average | report only (%) | all year | 001 |
| Flow, total | annual total | report only (Mgal/yr) | all year | 001 |
| Flow, total | annual total | report only (Mgal/yr) | all year | 001 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 001 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 002 |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | all year | 101 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | all year | 101 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | all year | 101 |
| pH | monthly average | report only (SU) | all year | 101 |
| Solids, total suspended | maximum monthly average | ≤ 30 mg/L | all year | 101 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | 101 |
| Solids, total suspended | cumulative total | ≤ 1370502 lb/yr | all year | 101 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 101 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 101 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 101 |
| Nitrogen, total [as N] | average | ≤ 3 mg/L | May–Oct | 101 |
| Nitrogen, total [as N] | annual average | ≤ 4 mg/L | all year | 101 |
| Nitrogen, total [as N] | cumulative total | ≤ 68484 lb/yr | May–Oct | 101 |
| Nitrogen, total [as N] | annual maximum | ≤ 182734 lb/yr | all year | 101 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 101 |
| Nitrogen, total [as N] | annual total | report only (lb/yr) | Dec | 101 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 101 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 3.7 mg/L | May–Oct | 101 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 101 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 9.3 mg/L | May–Oct | 101 |
| Nitrogen, ammonia total [as N] | maximum daily average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 101 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 101 |
| Phosphorus, total [as P] | annual average | ≤ .3 mg/L | all year | 101 |
| Phosphorus, total [as P] | average | ≤ .3 mg/L | May–Oct | 101 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 101 |
| Phosphorus, total [as P] | annual maximum | ≤ 13705 lb/yr | all year | 101 |
| Phosphorus, total [as P] | cumulative total | ≤ 6852 lb/yr | May–Oct | 101 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 101 |
| Benzo[a]pyrene | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 101 |
| Dibenz[a,h]anthracene | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 101 |
| Aldrin | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 101 |
| Dieldrin | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 101 |
| Toxaphene | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 101 |
| Hexachlorobenzene | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 101 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 101 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 101 |
| Chlorine, total residual | maximum | ≤ .1 mg/L | all year | 101 |
| Enterococci | monthly average | report only (MPN/100mL) | all year | 101 |
| Polychlorinated biphenyls [PCB] pg/L | annual average | report only (pg/L) | Dec | 101 |
| Polychlorinated biphenyls [PCB] pg/L | quarterly average | report only (g/qtr) | Mar, Jun, Sep, Dec | 101 |
| Polychlorinated biphenyls [PCB] pg/L | annual total | report only (g/yr) | Dec | 101 |
| Polychlorinated biphenyls [PCB] pg/L | quarterly average | report only (pg/L) | Mar, Jun, Sep, Dec | 101 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 101 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 101 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 101 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 102 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 102 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 102 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 103 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 103 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 103 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 104 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 104 |
| Solids, total suspended | cumulative total | report only (lb/yr) | all year | TRAD |
| Solids, total suspended | cumulative total | report only (lb/yr) | all year | TRAD |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | all year | TRAD |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | all year | TRAD |
| Phosphorus, total [as P] | cumulative total | report only (lb/yr) | all year | TRAD |
| Phosphorus, total [as P] | cumulative total | report only (lb/yr) | all year | TRAD |
| Flow | year-to-date total | report only (Mgal/yr) | all year | TRAD |
Cited limits by parameter: Maryland's rules and the federal ones.
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