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Sewerage Systems, Highlands, North Carolina. NPDES permit NC0051381, in force until Jan 31, 2028. Last 12 months: no values over a limit, 3 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 45 mg/L | all year |
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2 mg/L | Apr–Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5 mg/L | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10 mg/L | Apr–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 mg/L | Jan, Feb, Mar, Nov, Dec |
| Coliform, fecal MF, MFC broth, 44.5 C | monthly geometric mean | ≤ 200 #/100mL | all year |
| Coliform, fecal MF, MFC broth, 44.5 C | daily maximum | ≤ 400 #/100mL | all year |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .135 MGD | all year |
| Chlorine, total residual | daily maximum | ≤ 28 ug/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/NC0051381 · MCP: https://passage-data.com/mcp