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Sewage treatment plant, major discharger, Wilmington, North Carolina. NPDES permit NC0023973, in force until Nov 30, 2026. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year |
| Conductivity | daily maximum | report only (umho/cm) | all year |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | all year |
| pH | daily minimum | ≥ 6.8 SU | all year |
| pH | daily maximum | ≤ 8.5 SU | all year |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year |
| Solids, total suspended | daily maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 12 MGD | all year |
| Chlorine, total residual | daily maximum | ≤ 13 ug/L | all year |
| Enterococci | weekly geometric mean | ≤ 276 #/100mL | all year |
| Enterococci | monthly geometric mean | ≤ 35 #/100mL | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year |
Cited limits by parameter: North Carolina'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/NC0023973 · MCP: https://passage-data.com/mcp