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Sewage treatment plant, major discharger, Hagerstown, Maryland. NPDES permit MD0063509, in force until May 31, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 27 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 18 mg/L | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 41 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 27 mg/L | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 1026 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 684 lb/d | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 1540 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 1026 lb/d | May–Oct | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 27 mg/L | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 41 mg/L | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 1026 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 1540 lb/d | all year | 001 |
| Solids, total suspended | cumulative total | ≤ 374604 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] | cumulative total | ≤ 76674 lb/yr | all year | 001 |
| Nitrogen, total [as N] | monthly 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, organic total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 4.6 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 10.7 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 16.5 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 19.4 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 172 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 403 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 621 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 727 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] | cumulative total | ≤ 3758 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 |
| Benzo[a]pyrene | maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| N-Nitrosodimethylamine [NDMA] | maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Dibenz[a,h]anthracene | maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Benzidine | maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| 4,4'-DDT | maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Aldrin | maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Chlordane [tech mix. and metabolites] | maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Dieldrin | maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Toxaphene | maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Heptachlor | maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Hexachlorobenzene | maximum | 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 | ≤ .057 mg/L | all year | 001 |
| E. coli | maximum monthly geometric mean | ≤ 115 MPN/100mL | 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 | annual total | report only (Mgal/yr) | 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 |
| 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 |
| 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 | 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 |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], maximum monthly average | 5.7 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 0.1 mg/L (6 values) | 0.0175× |
| Nitrogen, ammonia total [as N], maximum monthly average | 214 lb/d (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 2.1 lb/d (6 values) | 0.00981× |
| Nitrogen, ammonia total [as N], maximum monthly average | 86 lb/d (May–Oct) | tighter | 2 lb/d (5 values) | 0.0233× |
| Nitrogen, ammonia total [as N], maximum monthly average | 2.3 mg/L (May–Oct) | tighter | 0.1 mg/L (5 values) | 0.0435× |
| Nitrogen, ammonia total [as N], maximum daily average | 8.6 mg/L (May–Oct) | tighter | 0.2 mg/L (5 values) | 0.0233× |
| Nitrogen, ammonia total [as N], maximum daily average | 324 lb/d (May–Oct) | tighter | 3.5 lb/d (5 values) | 0.0108× |
Cited limits by parameter: Maryland's rules and the federal ones.
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