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Sewage treatment plant, major discharger, Mount Pleasant, South Carolina. NPDES permit SC0040771, in force until Apr 30, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 1 mg/L | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 926 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 1389 lb/d | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | weekly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, total [as N] | weekly average | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Mar–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (mg/L) | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (mg/L) | Mar–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Mar–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) | Mar–Oct | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | weekly average | report only (lb/d) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | weekly average | report only (MGD) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ 1 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 1.5 mg/L | all year | 001 |
| Chlorine, total residual | monthly average | ≤ 30.86 lb/d | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 46.29 lb/d | all year | 001 |
| Enterococci | 30-day geometric mean | ≤ 35 MPN/100mL | all year | 001 |
| Enterococci | daily maximum | ≤ 104 MPN/100mL | all year | 001 |
| Enterococci | 30-day geometric mean | ≤ 35 MPN/100mL | all year | 001 |
| Enterococci | daily maximum | ≤ 800 MPN/100mL | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 37.5 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 771 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 1157 lb/d | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Carbonaceous oxygen demand, % removal | monthly average minimum | ≥ 85 % | all year | 001 |
| LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | daily minimum | report only (%) | all year | 001 |
| % Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | monthly average | ≤ 25 % | all year | 001 |
| % Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | daily maximum | ≤ 40 % | all year | 001 |
| IC25 Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | daily minimum | report only (%) | all year | 001 |
| Oxygen, dissolved [DO] | minimum | ≥ 1 mg/L | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 2652 lb/d | all year | 002 |
| Solids, total suspended | weekly average | ≤ 3978 lb/d | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | weekly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 002 |
| Nitrogen, total [as N] | weekly average | report only (lb/d) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Mar–Oct | 002 |
| Nitrogen, ammonia total [as N] | weekly average | report only (mg/L) | Jan, Feb, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | weekly average | report only (mg/L) | Mar–Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Jan, Feb, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Mar–Oct | 002 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) | Jan, Feb, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) | Mar–Oct | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 002 |
| Phosphorus, total [as P] | weekly average | report only (lb/d) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | weekly average | report only (MGD) | all year | 002 |
| Chlorine, total residual | monthly average | ≤ 1 mg/L | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ 1.5 mg/L | all year | 002 |
| Chlorine, total residual | monthly average | ≤ 88.4 lb/d | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ 132.6 lb/d | all year | 002 |
| Enterococci | 30-day geometric mean | ≤ 35 MPN/100mL | all year | 002 |
| Enterococci | daily maximum | ≤ 104 MPN/100mL | all year | 002 |
| Enterococci | 30-day geometric mean | ≤ 35 MPN/100mL | all year | 002 |
| Enterococci | daily maximum | ≤ 800 MPN/100mL | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 37.5 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 2210 lb/d | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 3315 lb/d | all year | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Carbonaceous oxygen demand, % removal | monthly average minimum | ≥ 85 % | all year | 002 |
| LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | daily minimum | report only (%) | all year | 002 |
| % Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | monthly average | ≤ 25 % | all year | 002 |
| % Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | daily maximum | ≤ 40 % | all year | 002 |
| IC25 Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | daily minimum | report only (%) | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 003 |
| Solids, total suspended | weekly average | ≤ 40 mg/L | all year | 003 |
| Solids, total suspended | monthly average | ≤ 42 lb/d | all year | 003 |
| Solids, total suspended | weekly average | ≤ 63 lb/d | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | weekly average | report only (MGD) | all year | 003 |
| pH | minimum | ≥ 6 SU | all year | 004 |
| pH | maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 004 |
| Solids, total suspended | weekly average | ≤ 40 mg/L | all year | 004 |
| Solids, total suspended | monthly average | ≤ 112 lb/d | all year | 004 |
| Solids, total suspended | weekly average | ≤ 168 lb/d | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | weekly average | report only (MGD) | all year | 004 |
| Oxygen demand, ultimate | monthly average | ≤ 11415 lb/d | Mar–Oct | 005 |
| Oxygen demand, ultimate | monthly average | ≤ 15111 lb/d | Jan, Feb, Nov, Dec | 005 |
| Oxygen demand, ultimate | weekly average | ≤ 17123 lb/d | Mar–Oct | 005 |
| Oxygen demand, ultimate | weekly average | ≤ 22667 lb/d | Jan, Feb, Nov, Dec | 005 |
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/SC0040771 · MCP: https://passage-data.com/mcp