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Dwelling Operators, Except Apartments, Seneca, South Carolina. NPDES permit SC0000591, in force until Jun 30, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 5 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 mg/L | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 42 lb/d | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 63 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 | ≤ 63 lb/d | all year |
| Solids, total suspended | weekly average | ≤ 94 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 | ≤ 6 mg/L | all year |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 9 mg/L | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 13 lb/d | all year |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 19 lb/d | all year |
| Phosphorus, total [as P] | monthly average | ≤ 2.9 mg/L | all year |
| Phosphorus, total [as P] | weekly average | ≤ 4.35 mg/L | all year |
| Phosphorus, total [as P] | monthly average | ≤ 6.05 lb/d | all year |
| Phosphorus, total [as P] | weekly average | ≤ 9.07 lb/d | all year |
| Polychlorinated biphenyls [PCBs] | monthly average | report only (mg/L) | all year |
| Polychlorinated biphenyls [PCBs] | daily maximum | report only (mg/L) | all year |
| Polychlorinated biphenyls [PCBs] | monthly average | report only (lb/d) | all year |
| Polychlorinated biphenyls [PCBs] | 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 | ≤ .5 mg/L | all year |
| Chlorine, total residual | daily maximum | ≤ 1 mg/L | all year |
| Chlorine, total residual | monthly average | ≤ 1.1 lb/d | all year |
| Chlorine, total residual | daily maximum | ≤ 2.1 lb/d | 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 |
| 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 |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C, monthly average | 15 mg/L | tighter | 2.8 mg/L (11 values, 4 below detection) | 0.187× |
| BOD, 5-day, 20 deg. C, weekly average | 22.5 mg/L | tighter | 2.8 mg/L (11 values, 3 below detection) | 0.124× |
| Chlorine, total residual, daily maximum | 0.8 mg/L | tighter | — | — |
| Nitrogen, ammonia total [as N], monthly average | 2 mg/L | tighter | 0.11 mg/L (11 values, 9 below detection) | — |
| Nitrogen, ammonia total [as N], weekly average | 3 mg/L | tighter | 0.11 mg/L (11 values, 7 below detection) | — |
| Oxygen demand, ultimate, monthly average | 194.28 lb/d | new | — | — |
| Phosphorus, total [as P], monthly average | 1.99 mg/L | tighter | 1.53 mg/L (11 values) | 0.769× |
| Phosphorus, total [as P], weekly average | 2.99 mg/L | tighter | 1.53 mg/L (11 values) | 0.512× |
Cited limits by parameter: South Carolina's rules and the federal ones.
Same industry: the 27 Real Estate permits in South Carolina.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/SC0000591 · MCP: https://passage-data.com/mcp