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Sewage treatment plant, major discharger, Elkton, Maryland. NPDES permit MD0020681 expired Jun 30, 2025; its limits still apply. Last 12 months: no values over a limit, 3 of 23 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 5.5 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | minimum 7-day average | ≥ 6 mg/L | Feb–May | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 10 mg/L | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 15 mg/L | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 267 lb/d | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 800 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 400 lb/d | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 1200 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 28 mg/L | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 42 mg/L | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 747 lb/d | all year | 001 |
| Solids, total suspended | annual maximum | ≤ 278669 lb/yr | all year | 001 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 1120 lb/d | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | annual maximum | ≤ 37156 lb/yr | all year | 001 |
| Nitrogen, total [as N] | total | report only (lb/mo) | 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] | annual total | report only (lb/yr) | all year | 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) | all year | 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 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | annual maximum | ≤ 2787 lb/yr | all year | 001 |
| Phosphorus, total [as P] | total | report only (lb/mo) | 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 |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | all year | 001 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 001 |
| Acrolein | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| 3,3'-Dichlorobenzidine | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Benzidine | 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 |
| Chlorine, total residual | daily maximum | ≤ .1 mg/L | all year | 001 |
| E. coli | maximum monthly geometric mean | ≤ 126 MPN/100mL | all year | 001 |
| Nonylphenol | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Polychlorinated biphenyls [PCB] pg/L | quarterly average | report only (pg/L) | Mar, Jun, Sep, Dec | 001 |
| Polychlorinated biphenyls [PCB] pg/L | quarterly total | report only (g/qtr) | Mar, Jun, Sep, Dec | 001 |
| Polychlorinated biphenyls [PCB] pg/L | annual maximum | report only (g/yr) | Dec | 001 |
| Flow, total | total | report only (Mgal/mo) | 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 | annual total | report only (Mgal/yr) | all year | 001 |
| 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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On EPA ECHO: Facility report · DMR history
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