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Sewage treatment plant, major discharger, Frederick, Maryland. NPDES permit MD0021822, in force until Dec 31, 2030. Last 12 months: no values over a limit, 1 required value missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 7 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 3 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 4.5 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 380 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 560 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 | ≤ 12 mg/L | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 18 mg/L | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 1500 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 2250 lb/d | all year | 001 |
| Solids, total suspended | annual maximum | ≤ 547200 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 maximum | ≤ 197138 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 | ≤ .5 mg/L | Apr–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 11 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 63 lb/d | Apr–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 1376 lb/d | Jan, Feb, Mar, 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 total | report only (lb/yr) | all year | 001 |
| Phosphorus, total [as P] | cumulative total | ≤ 16543 lb/yr | all year | 001 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 001 |
| Cadmium, total [as Cd] | monthly average | report only (mg/L) | all year | 001 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 001 |
| Benzo[k]fluoranthene | monthly average | report only (mg/L) | all year | 001 |
| Benzo[a]pyrene | monthly average | report only (mg/L) | all year | 001 |
| Chrysene | monthly average | report only (mg/L) | all year | 001 |
| Indeno[1,2,3-cd]pyrene | monthly average | report only (mg/L) | all year | 001 |
| N-Nitrosodi-N-propylamine | monthly average | report only (mg/L) | all year | 001 |
| N-Nitrosodimethylamine [NDMA] | monthly average | report only (mg/L) | all year | 001 |
| Benzo[a]anthracene | monthly average | report only (mg/L) | all year | 001 |
| Dibenz[a,h]anthracene | monthly average | report only (mg/L) | all year | 001 |
| 3,3'-Dichlorobenzidine | monthly average | report only (mg/L) | all year | 001 |
| Benzidine | monthly average | report only (mg/L) | all year | 001 |
| Hexachlorobenzene | 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 |
| E. coli | maximum monthly geometric mean | ≤ 126 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 |
| 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 |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], maximum monthly average | 788 lb/d (Jan, Feb, Mar, Nov, Dec) | tighter | 1 lb/d (3 values) | 0.00127× |
| Nitrogen, ammonia total [as N], maximum monthly average | 6.3 mg/L (Jan, Feb, Mar, Nov, Dec) | tighter | 0.013 mg/L (3 values) | 0.00206× |
Cited limits by parameter: Maryland's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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