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Sewage treatment plant, major discharger, Sykesville, Maryland. NPDES permit MD0021512, in force until Oct 31, 2029. Last 12 months: no values over a limit, 23 required values missing, 1 of 34 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 6 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 15 mg/L | Apr–Sep | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 23 mg/L | Apr–Sep | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 876 lb/d | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 438 lb/d | Apr–Sep | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 1314 lb/d | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 657 lb/d | Apr–Sep | 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 | ≤ 876 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 1314 lb/d | all year | 001 |
| Solids, total suspended | cumulative total | ≤ 319784 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) | Dec | 001 |
| Nitrogen, total [as N] | cumulative total | ≤ 42624 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 | ≤ .5 mg/L | Apr–Sep | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 1.2 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.4 mg/L | Apr–Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.6 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 14.6 lb/d | Apr–Sep | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 35 lb/d | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 70 lb/d | Apr–Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 163.5 lb/d | Jan, Feb, Mar, Oct, 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 | ≤ 3198 lb/yr | all year | 001 |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | Dec | 001 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 001 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 001 |
| Benzo[b]fluoranthene | minimum | report only (ug/L) | all year | 001 |
| Benzo[k]fluoranthene | minimum | report only (ug/L) | all year | 001 |
| Benzo[a]pyrene | minimum | report only (ug/L) | all year | 001 |
| Chrysene | minimum | report only (ug/L) | all year | 001 |
| 1,2-Diphenylhydrazine | minimum | report only (ug/L) | all year | 001 |
| Indeno[1,2,3-cd]pyrene | minimum | report only (ug/L) | all year | 001 |
| Benzo[a]anthracene | minimum | report only (ug/L) | all year | 001 |
| Dibenz[a,h]anthracene | minimum | report only (ug/L) | all year | 001 |
| 3,3'-Dichlorobenzidine | minimum | report only (ug/L) | all year | 001 |
| 2,3,7,8-TCDD TEC | minimum | report only (ug/L) | all year | 001 |
| Benzidine | minimum | report only (ug/L) | all year | 001 |
| 4,4'-DDT | minimum | report only (ug/L) | all year | 001 |
| 4,4'-DDD | minimum | report only (ug/L) | all year | 001 |
| 4,4'-DDE | minimum | report only (ug/L) | all year | 001 |
| Aldrin | minimum | report only (ug/L) | all year | 001 |
| Chlordane [tech mix. and metabolites] | minimum | report only (ug/L) | all year | 001 |
| Dieldrin | minimum | report only (ug/L) | all year | 001 |
| Toxaphene | minimum | report only (ug/L) | all year | 001 |
| Heptachlor | minimum | report only (ug/L) | all year | 001 |
| Heptachlor epoxide | minimum | report only (ug/L) | all year | 001 |
| Hexachlorobenzene | minimum | report only (ug/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 | ≤ .011 mg/L | all year | 001 |
| E. coli | maximum monthly geometric mean | ≤ 126 MPN/100mL | all year | 001 |
| Nonylphenol | minimum | report only (ug/L) | all year | 001 |
| Mercury, total recoverable | minimum | report only (ug/L) | all year | 001 |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year | 001 |
| Flow, total | annual total | report only (Mgal/yr) | Dec | 001 |
| Flow, total | 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 |
| 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 |
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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