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Sewage treatment plant, Centreville, Maryland. NPDES permit MD0020834, in force until Nov 30, 2026. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 28 mg/L | Jan, Feb, Mar, Dec |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | Apr–Nov |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 42 mg/L | Jan, Feb, Mar, Dec |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | Apr–Nov |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 130 lb/d | Jan, Feb, Mar, Dec |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | Apr–Nov |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 190 lb/d | Jan, Feb, Mar, Dec |
| BOD, 5-day, 20 deg. C | weekly average | report only (lb/d) | Apr–Nov |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 8.5 SU | all year |
| Solids, total suspended | maximum monthly average | ≤ 28 mg/L | Jan, Feb, Mar, Dec |
| Solids, total suspended | monthly average | report only (mg/L) | Apr–Nov |
| Solids, total suspended | maximum weekly average | ≤ 42 mg/L | Jan, Feb, Mar, Dec |
| Solids, total suspended | weekly average | report only (mg/L) | Apr–Nov |
| Solids, total suspended | maximum monthly average | ≤ 130 lb/d | Jan, Feb, Mar, Dec |
| Solids, total suspended | monthly average | report only (lb/d) | Apr–Nov |
| Solids, total suspended | maximum weekly average | ≤ 190 lb/d | Jan, Feb, Mar, Dec |
| Solids, total suspended | weekly average | report only (lb/d) | Apr–Nov |
| Nitrogen, total [as N] | maximum monthly average | ≤ 5.5 mg/L | Jan, Feb, Mar, Dec |
| Nitrogen, total [as N] | monthly total | ≤ 750 lb/mo | Jan, Feb, Mar, Dec |
| Nitrogen, total [as N] | cumulative total | ≤ 3004 lb/yr | Jan, Feb, Mar, Dec |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | maximum monthly average | ≤ 1 mg/L | Jan, Feb, Mar, Dec |
| Phosphorus, total [as P] | cumulative total | ≤ 457 lb/yr | Jan, Feb, Mar, Dec |
| Phosphorus, total [as P] | monthly total | ≤ 140 lb/mo | Jan, Feb, Mar, Dec |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Chlorine, total residual | maximum | ≤ .1 mg/L | all year |
| E. coli | maximum monthly geometric mean | ≤ 116 MPN/100mL | all year |
| Phosphorous, in total orthophosphate | monthly average | report only (mg/L) | all year |
| BOD, 5-day, percent removal | minimum | report only (%) | Jan, Feb, Mar, Dec |
| Solids, suspended percent removal | minimum | report only (%) | all year |
| Flow, total | total | report only (Mgal/mo) | all year |
Cited limits by parameter: Maryland's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MD0020834 · MCP: https://passage-data.com/mcp