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Sewage treatment plant, major discharger, Baltimore, Maryland. NPDES permit MD0021601 expired Sep 30, 2022; its limits still apply. Last 12 months: over a limit 4 times (last March 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Nitrogen, total [as N], EPA's "SEAS TDT" | 416900 lb/yr | ≤ 333330 lb/yr | 25% |
| October 2025 | Phosphorus, total [as P], EPA's "SEAS TDT" | 37100 lb/yr | ≤ 33330 lb/yr | 11% |
| March 2026 | BOD, 5-day, 20 deg. C, maximum monthly average | 37 mg/L | ≤ 30 mg/L | 23% |
| March 2026 | BOD, 5-day, 20 deg. C, maximum weekly average | 47 mg/L | ≤ 45 mg/L | 4% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | Feb–May |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 6 mg/L | Feb–May |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | all year |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 18000 lb/d | all year |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 27000 lb/d | all year |
| pH | minimum | ≥ 6 SU | all year |
| pH | maximum | ≤ 8.5 SU | all year |
| Solids, total suspended | maximum monthly average | ≤ 30 mg/L | all year |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year |
| Solids, total suspended | maximum monthly average | ≤ 18000 lb/d | all year |
| Solids, total suspended | monthly total | report only (lb/mo) | all year |
| Solids, total suspended | maximum weekly average | ≤ 27000 lb/d | all year |
| Solids, total suspended | annual maximum | ≤ 6669776 lb/yr | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year |
| Nitrogen, total [as N] | cumulative total | ≤ 889300 lb/yr | all year |
| Nitrogen, total [as N] | EPA's "SEAS TDT" | ≤ 333330 lb/yr | May–Oct |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, organic total [as N] | monthly average | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 6.3 mg/L | May–Oct |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 3836 lb/d | May–Oct |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | monthly average | report only (lb/d) | all year |
| Phosphorus, total [as P] | maximum monthly average | ≤ 2 mg/L | all year |
| Phosphorus, total [as P] | maximum weekly average | ≤ 3 mg/L | all year |
| Phosphorus, total [as P] | monthly load | report only (lb/mo) | all year |
| Phosphorus, total [as P] | maximum monthly average | ≤ 1220 lb/d | all year |
| Phosphorus, total [as P] | maximum weekly average | ≤ 1830 lb/d | all year |
| Phosphorus, total [as P] | cumulative total | ≤ 66700 lb/yr | all year |
| Phosphorus, total [as P] | EPA's "SEAS TDT" | ≤ 33330 lb/yr | May–Oct |
| Cyanide, free [amenable to chlorination] | monthly average | report only (ppb) | all year |
| Cyanide, free [amenable to chlorination] | monthly load | report only (lb/d) | all year |
| Copper, total [as Cu] | monthly average | report only (ppb) | all year |
| Copper, total [as Cu] | monthly load | report only (lb/d) | all year |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year |
| Phosphate, ortho [as P] | monthly average | report only (lb/d) | all year |
| Heptachlor epoxide | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Chlorine, total residual | maximum | < .1 mg/L | all year |
| Enterococci | monthly geometric mean | ≤ 35 MPN/100mL | all year |
| Polychlorinated biphenyls [PCB] pg/L | quarterly average | report only (pg/L) | Mar, Jun, Sep, Dec |
| Polychlorinated biphenyls [PCB] pg/L | quarterly average | report only (g/qtr) | Mar, Jun, Sep, Dec |
| Flow, total | total | report only (Mgal/mo) | all year |
| Flow, total | annual total | report only (Mgal/yr) | Dec |
Cited limits by parameter: Maryland's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/MD0021601 · MCP: https://passage-data.com/mcp