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Sewerage Systems, major discharger, Westernport, Maryland. NPDES permit MD0021687 expired Aug 31, 2019; its limits still apply. Last 12 months: over a limit 8 times (last July 2026), 16 of 44 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Nitrogen, total [as N], daily maximum | 10.6 mg/L | ≤ 8 mg/L | 33% |
| December 2025 | Nitrogen, total [as N], maximum monthly average | 7.32 mg/L | ≤ 4 mg/L | 83% |
| January 2026 | Nitrogen, total [as N], daily maximum | 8.7 mg/L | ≤ 8 mg/L | 9% |
| January 2026 | Nitrogen, total [as N], maximum monthly average | 5.672 mg/L | ≤ 4 mg/L | 42% |
| February 2026 | Nitrogen, total [as N], daily maximum | 10.43 mg/L | ≤ 8 mg/L | 30% |
| February 2026 | Nitrogen, total [as N], maximum monthly average | 6.9 mg/L | ≤ 4 mg/L | 73% |
| July 2026 | Nitrogen, total [as N], daily maximum | 9.87 mg/L | ≤ 8 mg/L | 23% |
| July 2026 | Nitrogen, total [as N], maximum monthly average | 4.79 mg/L | ≤ 4 mg/L | 20% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | daily maximum | ≤ 100 deg F | all year | 001 |
| Turbidity | maximum monthly average | ≤ 150 NTU | all year | 001 |
| Turbidity | daily maximum | ≤ 300 NTU | all year | 001 |
| Color [PT-CO units] | monthly average | report only (col unit (pc)) | all year | 001 |
| Color [PT-CO units] | daily maximum | report only (col unit (pc)) | all year | 001 |
| Color | maximum monthly average | ≤ 75060 lb/d | all year | 001 |
| Color | daily maximum | ≤ 138860 lb/d | all year | 001 |
| Oxygen, dissolved [DO] | minimum | ≥ 5 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 52 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 100 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 8023 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 15429 lb/d | all year | 001 |
| pH | minimum | report only (SU) | all year | 001 |
| pH | maximum | report only (SU) | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 50 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 110 mg/L | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 7715 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 16972 lb/d | all year | 001 |
| Nitrogen, total [as N] | maximum monthly average | ≤ 4 mg/L | all year | 001 |
| Nitrogen, total [as N] | daily maximum | ≤ 8 mg/L | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | 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) | all year | 001 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | cumulative total | ≤ 79218 lb/yr | all year | 001 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, organic total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | 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] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 001 |
| Phosphorus, total [as P] | cumulative total | report only (lb/yr) | all year | 001 |
| Phosphorus, total [as P] | cumulative total | ≤ 30773 lb/yr | all year | 001 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] [adjusted] | monthly average | report only (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 | daily maximum | report only (MGD) | all year | 001 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 001 |
| pH range excursions, > 60 minutes | maximum | ≤ 0 occur/mo | all year | 001 |
| pH range excursions, monthly total accum | maximum | ≤ 446 min | all year | 001 |
| Turbidity | maximum monthly average | ≤ 50 NTU | all year | 01A |
| Turbidity | daily maximum | ≤ 150 NTU | all year | 01A |
| Color [PT-CO units] | weekly average | ≤ 75 col unit (pc) | all year | 01A |
| Color [PT-CO units] | daily maximum | ≤ 150 col unit (pc) | all year | 01A |
| E. coli | maximum monthly geometric mean | ≤ 126 MPN/100mL | all year | 101 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 901 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 901 |
Cited limits by parameter: Maryland's rules and the federal ones.
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