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Sewage treatment plant, major discharger, Seaford, Delaware. NPDES permit DE0020265 expired Oct 31, 2020; its limits still apply. Last 12 months: no values over a limit, 65 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily average | report only (mg/L) | all year |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | all year |
| Oxygen, dissolved [DO] | daily average | report only (lb/d) | all year |
| Oxygen, dissolved [DO] | daily maximum | report only (lb/d) | all year |
| BOD, 5-day, 20 deg. C | daily average | ≤ 12 mg/L | all year |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 18 mg/L | all year |
| BOD, 5-day, 20 deg. C | daily average | ≤ 198 lb/d | all year |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 297 lb/d | all year |
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Solids, total suspended | daily average | ≤ 8 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 13 mg/L | all year |
| Solids, total suspended | daily average | ≤ 135 lb/d | all year |
| Solids, total suspended | daily maximum | ≤ 207 lb/d | all year |
| Nitrogen, total [as N] | daily average | report only (mg/L) | May–Sep |
| Nitrogen, total [as N] | daily average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | May–Sep |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, total [as N] | daily average | ≤ 187.9 lb/d | May–Sep |
| Nitrogen, total [as N] | daily average | report only (lb/d) | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | May–Sep |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, total [as N] | rolling average | ≤ 61541 lb/yr | all year |
| Nitrogen, organic total [as N] | daily average | report only (mg/L) | all year |
| Nitrogen, organic total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, organic total [as N] | daily average | report only (lb/d) | all year |
| Nitrogen, organic total [as N] | daily maximum | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | daily average | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | daily average | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily average | report only (lb/d) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (lb/d) | all year |
| Nitrite + Nitrate total [as N] | daily average | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | daily average | report only (lb/d) | all year |
| Nitrite + Nitrate total [as N] | daily maximum | report only (lb/d) | all year |
| Phosphorus, total [as P] | daily average | report only (mg/L) | all year |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | daily average | ≤ 36 lb/d | all year |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year |
| Phosphorus, total [as P] | rolling average | ≤ 7067 lb/yr | all year |
| Phosphorous, total organic [as P] | daily average | report only (mg/L) | all year |
| Phosphorous, total organic [as P] | daily maximum | report only (mg/L) | all year |
| Phosphorous, total organic [as P] | daily average | report only (lb/d) | all year |
| Phosphorous, total organic [as P] | daily maximum | report only (lb/d) | all year |
| Hardness, total [as CaCO3] | daily average | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | daily average | report only (lb/d) | all year |
| Hardness, total [as CaCO3] | daily maximum | report only (lb/d) | all year |
| Copper, dissolved [as Cu] | daily average | ≤ 18.8 ug/L | all year |
| Copper, dissolved [as Cu] | daily maximum | ≤ 32.3 ug/L | all year |
| Copper, dissolved [as Cu] | daily average | ≤ .314 lb/d | all year |
| Copper, dissolved [as Cu] | daily maximum | ≤ .54 lb/d | all year |
| Zinc, dissolved [as Zn] | daily average | report only (mg/L) | all year |
| Zinc, dissolved [as Zn] | daily maximum | report only (mg/L) | all year |
| Zinc, dissolved [as Zn] | daily average | report only (lb/d) | all year |
| Zinc, dissolved [as Zn] | daily maximum | report only (lb/d) | all year |
| Phosphate, ortho [as P] | daily average | report only (mg/L) | all year |
| Phosphate, ortho [as P] | daily maximum | report only (mg/L) | all year |
| Phosphate, ortho [as P] | daily average | report only (lb/d) | all year |
| Phosphate, ortho [as P] | daily maximum | report only (lb/d) | all year |
| Enterococci: group D, MF trans, M-E, EIA | geometric mean | ≤ 100 CFU/100mL | all year |
| Enterococci: group D, MF trans, M-E, EIA | daily maximum | ≤ 185 CFU/100mL | all year |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year |
Cited limits by parameter: Delaware'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/DE0020265 · MCP: https://passage-data.com/mcp