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Sewage treatment plant, major discharger, Charlestown, Maryland. NPDES permit MD0052027, in force until Nov 30, 2030. Last 12 months: no values over a limit, 1 of 36 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 5.5 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 6 mg/L | Feb–May | 001 |
| Oxygen, dissolved [DO] | instantaneous 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 | maximum weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 500 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 750 lb/d | 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 | maximum weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 500 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 750 lb/d | all year | 001 |
| Solids, total suspended | annual maximum | ≤ 182734 lb/yr | all year | 001 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | 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] | annual maximum | report only (lb/yr) | all year | 001 |
| Nitrogen, total [as N] | annual maximum | ≤ 27212 lb/yr | all year | 001 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 1.6 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 4.2 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 9.8 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 13 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 26.7 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 70 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 163.5 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 216.8 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 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 | ≤ 1790 lb/yr | all year | 001 |
| Phosphorus, total [as P] | monthly 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 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 001 |
| .beta.-Endosulfan | monthly average | report only (ng/L) | all year | 001 |
| .alpha.-Endosulfan | monthly average | report only (ng/L) | all year | 001 |
| 3,3'-Dichlorobenzidine | monthly average | report only (ng/L) | all year | 001 |
| Benzidine | monthly average | report only (ng/L) | all year | 001 |
| Aldrin | monthly average | report only (ng/L) | all year | 001 |
| Chlordane [tech mix. and metabolites] | monthly average | report only (ng/L) | all year | 001 |
| Endrin | monthly average | report only (ng/L) | all year | 001 |
| Toxaphene | monthly average | report only (ng/L) | all year | 001 |
| Heptachlor | monthly average | report only (ng/L) | all year | 001 |
| Heptachlor epoxide | monthly average | report only (ng/L) | all year | 001 |
| Hexachlorobenzene | monthly average | report only (ng/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 |
| E. coli | monthly geometric mean | ≤ 126 MPN/100mL | all year | 001 |
| Hexachlorocyclohexane, total | monthly average | report only (ng/L) | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | report only (%) | all year | 001 |
| Flow, total | annual total | report only (Mgal/yr) | Dec | 001 |
| Flow, total | annual total | report only (Mgal/yr) | all year | 001 |
| Flow, total | annual total | report only (Mgal/yr) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 101 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 101 |
| 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 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Enterococci, monthly geometric mean | 35 MPN/100mL | new | — | — |
| Nitrogen, ammonia total [as N], maximum monthly average | 16.7 lb/d (May–Oct) | tighter | 1.48 lb/d (6 values) | 0.0886× |
| Nitrogen, ammonia total [as N], maximum monthly average | 1 mg/L (May–Oct) | tighter | 0.125 mg/L (6 values) | 0.125× |
| Nitrogen, ammonia total [as N], maximum monthly average | 3.9 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 0.025 mg/L (6 values) | 0.00641× |
| Nitrogen, ammonia total [as N], maximum monthly average | 65 lb/d (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 1 lb/d (6 values) | 0.0154× |
| Nitrogen, ammonia total [as N], maximum daily average | 76.7 lb/d (May–Oct) | tighter | 2.6 lb/d (6 values) | 0.0339× |
| Nitrogen, ammonia total [as N], maximum daily average | 4.6 mg/L (May–Oct) | tighter | 0.21 mg/L (6 values) | 0.0457× |
Cited limits by parameter: Maryland's rules and the federal ones.
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