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Sewage treatment plant, major discharger, Smithfield, North Carolina. NPDES permit NC0030716 expired Mar 31, 2026; its limits still apply. Last 12 months: over a limit 2 times (last December 2025), 20 required values missing, 22 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | Flow, in conduit or thru treatment plant, 30-day average | 4.0082 MGD | ≤ 4 MGD | 0% |
| December 2025 | Flow, in conduit or thru treatment plant, 30-day average | 4.0779 MGD | ≤ 4 MGD | 2% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Conductivity | daily maximum | report only (umho/cm) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | 7-day average | ≤ 7.5 mg/L | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | 7-day average | ≤ 15 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 5 mg/L | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 10 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | report only (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] | 7-day average | ≤ 3 mg/L | Apr–Oct | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 6 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | Apr–Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2 mg/L | Jan, Feb, Mar, Nov, Dec | 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 |
| Coliform, fecal MF, MFC broth, 44.5 C | weekly geometric mean | ≤ 400 #/100mL | all year | 001 |
| Coliform, fecal MF, MFC broth, 44.5 C | monthly geometric mean | ≤ 200 #/100mL | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 9.5 MGD | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 28 ug/L | all year | 001 |
| Flow, total | daily maximum | report only (Mgal/mo) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 002 |
| Conductivity | daily maximum | report only (umho/cm) | all year | 002 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | 7-day average | ≤ 7.5 mg/L | Apr–Oct | 002 |
| BOD, 5-day, 20 deg. C | 7-day average | ≤ 15 mg/L | Jan, Feb, Mar, Nov, Dec | 002 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 5 mg/L | Apr–Oct | 002 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 10 mg/L | Jan, Feb, Mar, Nov, Dec | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 002 |
| pH | daily minimum | ≥ 6 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | report only (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] | 7-day average | ≤ 3 mg/L | Apr–Oct | 002 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 6 mg/L | Jan, Feb, Mar, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | Apr–Oct | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2 mg/L | Jan, Feb, Mar, Nov, Dec | 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 |
| Coliform, fecal MF, MFC broth, 44.5 C | weekly geometric mean | ≤ 400 #/100mL | all year | 002 |
| Coliform, fecal MF, MFC broth, 44.5 C | monthly geometric mean | ≤ 200 #/100mL | all year | 002 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 4 MGD | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ 28 ug/L | all year | 002 |
| Flow, total | daily maximum | report only (Mgal/mo) | all year | 002 |
Cited limits by parameter: North Carolina's rules and the federal ones.
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