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Water Supply, Raleigh, North Carolina. NPDES permit NC0082376, in force until May 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Turbidity | daily maximum | report only (NTU) | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (lb/mo) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | 90-day average | ≤ 2 mg/L | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 17 ug/L | all year | 001 |
| Duration of discharge | daily maximum | report only (hr) | all year | 001 |
| Flow, total | daily maximum | report only (Mgal/mo) | all year | 001 |
| Turbidity | daily maximum | report only (NTU) | all year | 002 |
| pH | daily minimum | ≥ 6 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (lb/mo) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | 90-day average | ≤ 2 mg/L | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ 17 ug/L | all year | 002 |
| Flow, total | daily maximum | report only (Mgal/mo) | all year | 002 |
| Turbidity | daily maximum | report only (NTU) | all year | 003 |
| pH | daily minimum | ≥ 6 SU | all year | 003 |
| pH | daily maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | 90-day average | ≤ 2 mg/L | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 003 |
| Duration of discharge | daily maximum | report only (hr) | all year | 003 |
Cited limits by parameter: North Carolina's rules and the federal ones.
Same industry: the 130 Water Supply permits in North Carolina.
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