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Sewage treatment plant, Holly Hill, South Carolina. NPDES permit SC0049366, in force until Aug 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 6 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 6.67 mg/L | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 10 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 27.81 lb/d | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 41.7 lb/d | all year |
| pH | minimum | ≥ 6 SU | all year |
| pH | maximum | ≤ 8.5 SU | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 125.1 lb/d | all year |
| Solids, total suspended | weekly average | ≤ 187.7 lb/d | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, total [as N] | weekly average | report only (mg/L) | all year |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year |
| Nitrogen, total [as N] | weekly average | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Mar–Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 2.25 mg/L | Mar–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6.255 lb/d | Mar–Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 9.383 lb/d | Mar–Oct |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year |
| Phosphorus, total [as P] | weekly average | report only (lb/d) | all year |
| Cadmium, total [as Cd] | monthly average | report only (ug/L) | all year |
| Cadmium, total [as Cd] | daily maximum | report only (ug/L) | all year |
| Cadmium, total [as Cd] | monthly average | report only (lb/d) | all year |
| Cadmium, total [as Cd] | daily maximum | report only (lb/d) | all year |
| Copper, total [as Cu] | monthly average | report only (ug/L) | all year |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year |
| Copper, total [as Cu] | monthly average | report only (lb/d) | all year |
| Copper, total [as Cu] | daily maximum | report only (lb/d) | all year |
| Lead, total [as Pb] | monthly average | report only (ug/L) | all year |
| Lead, total [as Pb] | daily maximum | report only (ug/L) | all year |
| Lead, total [as Pb] | monthly average | report only (lb/d) | all year |
| Lead, total [as Pb] | daily maximum | report only (lb/d) | all year |
| Zinc, total [as Zn] | monthly average | report only (mg/L) | all year |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year |
| Zinc, total [as Zn] | monthly average | report only (lb/d) | all year |
| Zinc, total [as Zn] | daily maximum | report only (lb/d) | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | weekly average | report only (MGD) | all year |
| Chlorine, total residual | monthly average | ≤ .011 mg/L | all year |
| Chlorine, total residual | daily maximum | ≤ .019 mg/L | all year |
| E. coli | 30-day geometric mean | ≤ 126 MPN/100mL | all year |
| E. coli | daily maximum | ≤ 349 MPN/100mL | all year |
| E. coli | 30-day geometric mean | ≤ 126 MPN/100mL | all year |
| E. coli | daily maximum | ≤ 800 MPN/100mL | all year |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year |
| Mercury, total [as Hg] | monthly average | report only (lb/d) | all year |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | all year |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | daily minimum | report only (%) | all year |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average | ≤ 25 % | all year |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily maximum | ≤ 40 % | all year |
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily minimum | report only (%) | all year |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Cadmium, total [as Cd], daily maximum | 0.015 lb/d | new | — | — |
| Cadmium, total [as Cd], daily maximum | 1.8 ug/L | new | — | — |
| Cadmium, total [as Cd], monthly average | 0.9 ug/L | new | — | — |
| Cadmium, total [as Cd], monthly average | 0.0075 lb/d | new | — | — |
| Copper, total [as Cu], daily maximum | 0.11 lb/d | new | — | — |
| Copper, total [as Cu], daily maximum | 12.7 ug/L | new | — | — |
| Copper, total [as Cu], monthly average | 9.7 ug/L | new | — | — |
| Copper, total [as Cu], monthly average | 0.081 lb/d | new | — | — |
| Lead, total [as Pb], daily maximum | 0.76 lb/d | new | — | — |
| Lead, total [as Pb], daily maximum | 91 ug/L | new | — | — |
| Lead, total [as Pb], monthly average | 3.5 ug/L | new | — | — |
| Lead, total [as Pb], monthly average | 0.029 lb/d | new | — | — |
| Mercury, total [as Hg], daily maximum | 0.00061 lb/d | new | — | — |
| Mercury, total [as Hg], daily maximum | 73 ng/L | new | — | — |
| Mercury, total [as Hg], monthly average | 50 ng/L | new | — | — |
| Mercury, total [as Hg], monthly average | 0.00042 lb/d | new | — | — |
| Zinc, total [as Zn], daily maximum | 0.16 mg/L | new | — | — |
| Zinc, total [as Zn], daily maximum | 1.3 lb/d | new | — | — |
| Zinc, total [as Zn], monthly average | 0.16 mg/L | new | — | — |
| Zinc, total [as Zn], monthly average | 1.3 lb/d | new | — | — |
Cited limits by parameter: South 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/SC0049366 · MCP: https://passage-data.com/mcp