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Sewerage Systems, Issue, Maryland. NPDES permit MD0057525, in force until Jan 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 5 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly maximum | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 75 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly maximum | ≤ 113 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | 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 | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 75 lb/d | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ 113 lb/d | all year | 001 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 001 |
| Solids, total suspended | cumulative total | ≤ 27410 lb/yr | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | maximum monthly average | ≤ 10 mg/L | all year | 001 |
| Nitrogen, total [as N] | weekly maximum | ≤ 15 mg/L | all year | 001 |
| Nitrogen, total [as N] | maximum monthly average | ≤ 25 lb/d | all year | 001 |
| Nitrogen, total [as N] | weekly maximum | ≤ 37.5 lb/d | all year | 001 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | monthly total | ≤ 3655 lb/yr | all year | 001 |
| Nitrogen, total [as N] | annual total | report only (lb/yr) | all year | 001 |
| Nitrogen, organic total [as N] | maximum monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 2.9 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.6 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 7.3 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 34 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, Kjeldahl, total [as N] | maximum monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | maximum monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | maximum monthly average | ≤ .5 mg/L | all year | 001 |
| Phosphorus, total [as P] | weekly maximum | ≤ .75 mg/L | all year | 001 |
| Phosphorus, total [as P] | maximum monthly average | ≤ 1.25 lb/d | all year | 001 |
| Phosphorus, total [as P] | weekly maximum | ≤ 1.88 lb/d | all year | 001 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 001 |
| Phosphorus, total [as P] | cumulative total | ≤ 274 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 |
| 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 |
| Coliform, fecal general | monthly average | report only (MPN/100mL) | Jan, Feb, Mar, Nov, Dec | 001 |
| Coliform, fecal general | maximum | ≤ 14 MPN/100mL | Apr–Oct | 001 |
| Polychlorinated biphenyls [PCB] pg/L | quarterly average | report only (ng/L) | all year | 001 |
| Polychlorinated biphenyls [PCB] pg/L | quarterly total | report only (g/qtr) | all year | 001 |
| Polychlorinated biphenyls [PCB] pg/L | annual maximum | report only (g/yr) | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 001 |
| Flow, total | annual total | report only (Mgal/yr) | all year | 001 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 101A |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | all year | 101A |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | all year | 101A |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 75 lb/d | all year | 101A |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 113 lb/d | all year | 101A |
| pH | minimum | ≥ 6.5 SU | all year | 101A |
| pH | maximum | ≤ 8.5 SU | all year | 101A |
| Solids, total suspended | maximum monthly average | ≤ 30 mg/L | all year | 101A |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | 101A |
| Solids, total suspended | maximum monthly average | ≤ 75 lb/d | all year | 101A |
| Solids, total suspended | maximum weekly average | ≤ 113 lb/d | all year | 101A |
| Nitrogen, total [as N] | maximum monthly average | ≤ 10 mg/L | all year | 101A |
| Nitrogen, total [as N] | maximum weekly average | ≤ 15 mg/L | all year | 101A |
| Nitrogen, total [as N] | maximum monthly average | ≤ 25 lb/d | all year | 101A |
| Nitrogen, total [as N] | maximum weekly average | ≤ 37.5 lb/d | all year | 101A |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 101A |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | all year | 101A |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 101A |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 101A |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 2.9 mg/L | May–Oct | 101A |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 13.6 mg/L | May–Oct | 101A |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec | 101A |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 7.3 lb/d | May–Oct | 101A |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 34 lb/d | May–Oct | 101A |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 101A |
| Phosphorus, total [as P] | maximum monthly average | ≤ .5 mg/L | all year | 101A |
| Phosphorus, total [as P] | maximum weekly average | ≤ .75 mg/L | all year | 101A |
| Phosphorus, total [as P] | maximum monthly average | ≤ 1.3 lb/d | all year | 101A |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 101A |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | all year | 101A |
| Phosphorus, total [as P] | maximum weekly average | ≤ 1.9 lb/d | all year | 101A |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 101A |
| Polychlorinated biphenyls [PCBs] | quarterly average | report only (ng/L) | Mar, Jun, Sep, Dec | 101A |
| Polychlorinated biphenyls [PCBs] | cumulative total | report only (g/yr) | Mar, Jun, Sep, Dec | 101A |
| Polychlorinated biphenyls [PCBs] | quarterly total | report only (g/qtr) | Mar, Jun, Sep, Dec | 101A |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 101A |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 101A |
| Chlorine, total residual | daily maximum | ≤ .1 mg/L | all year | 101A |
| Coliform, fecal general | maximum monthly geometric mean | ≤ 14 MPN/100mL | all year | 101A |
| BOD, 5-day, percent removal | monthly average | report only (%) | all year | 101A |
| Solids, suspended percent removal | monthly average | report only (% survival) | all year | 101A |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 101A |
| Oxygen, dissolved [DO] | instantaneous minimum | report only (mg/L) | all year | 102A |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 102A |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 102A |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 102A |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 102A |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 102A |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 102A |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 102A |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 102A |
| Coliform, fecal general | 90th percentile | report only (MPN/100mL) | Apr–Oct | 102A |
| Coliform, fecal general | monthly median | report only (MPN/100mL) | Apr–Oct | 102A |
| Coliform, fecal general | monthly median | report only (MPN/100mL) | Jan, Feb, Mar, Nov, Dec | 102A |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 201 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 201 |
| Solids, total suspended | monthly total | report only (lb/yr) | all year | TRAD |
| Solids, total suspended | monthly total | report only (lb/yr) | all year | TRAD |
| Nitrogen, total [as N] | monthly total | report only (lb/yr) | all year | TRAD |
| Nitrogen, total [as N] | monthly total | report only (lb/yr) | all year | TRAD |
| Phosphorus, total [as P] | monthly total | report only (lb/yr) | all year | TRAD |
| Phosphorus, total [as P] | monthly total | report only (lb/yr) | all year | TRAD |
| Flow | year-to-date total | report only (Mgal/yr) | all year | TRAD |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nitrogen, total [as N], maximum monthly average | 15 lb/d | tighter | 1.45 lb/d (11 values) | 0.0967× |
| Nitrogen, total [as N], maximum monthly average | 6 mg/L | tighter | 3.84 mg/L (11 values) | 0.64× |
| Nitrogen, total [as N], weekly maximum | 9 mg/L | tighter | 7.12 mg/L (11 values) | 0.791× |
| Nitrogen, total [as N], weekly maximum | 22.5 lb/d | tighter | 2.33 lb/d (11 values) | 0.104× |
| Phosphorus, total [as P], maximum monthly average | 0.3 mg/L | tighter | 0.16 mg/L (11 values) | 0.533× |
| Phosphorus, total [as P], maximum monthly average | 0.75 lb/d | tighter | 0.06 lb/d (11 values) | 0.08× |
| Phosphorus, total [as P], weekly maximum | 1.13 lb/d | tighter | 0.08 lb/d (11 values) | 0.0708× |
| Phosphorus, total [as P], weekly maximum | 0.45 mg/L | tighter | 0.21 mg/L (11 values) | 0.467× |
Cited limits by parameter: Maryland's rules and the federal ones.
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