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Sewage treatment plant, Prosperity, South Carolina. NPDES permit SC0048313, in force until Feb 28, 2031. 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 | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 238 lb/d | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 357 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 | ≤ 238 lb/d | all year |
| Solids, total suspended | weekly average | ≤ 357 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 | ≤ 10 mg/L | Jan, Feb, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6.54 mg/L | Mar–Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 15 mg/L | Jan, Feb, Nov, Dec |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 9.81 mg/L | Mar–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 79 lb/d | Jan, Feb, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 52 lb/d | Mar–Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 119 lb/d | Jan, Feb, Nov, Dec |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 78 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 |
| 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 | ≤ .066 mg/L | all year |
| Chlorine, total residual | daily maximum | ≤ .113 mg/L | all year |
| Chlorine, total residual | monthly average | ≤ .52 lb/d | all year |
| Chlorine, total residual | daily maximum | ≤ .9 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 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | 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 | 2.2 mg/L (11 values) | 0.147× |
| BOD, 5-day, 20 deg. C, monthly average | 156 lb/d | tighter | 6.3 lb/d (11 values) | 0.0404× |
| BOD, 5-day, 20 deg. C, weekly average | 235 lb/d | tighter | 7 lb/d (11 values) | 0.0298× |
| BOD, 5-day, 20 deg. C, weekly average | 22.5 mg/L | tighter | 2.5 mg/L (11 values) | 0.111× |
| Chlorine, total residual, daily maximum | 0.064 mg/L | tighter | 0 mg/L (11 values) | 0× |
| Chlorine, total residual, monthly average | 0.037 mg/L | tighter | 0 mg/L (11 values) | 0× |
| Nitrogen, ammonia total [as N], monthly average | 6 mg/L (Jan, Feb, Nov, Dec) | tighter | 0.1375 mg/L (4 values) | 0.0229× |
| Nitrogen, ammonia total [as N], monthly average | 4.1 mg/L (Mar–Oct) | tighter | 0.1 mg/L (7 values) | 0.0244× |
| Nitrogen, ammonia total [as N], weekly average | 9 mg/L (Jan, Feb, Nov, Dec) | tighter | 0.2 mg/L (4 values) | 0.0222× |
| Nitrogen, ammonia total [as N], weekly average | 6.15 mg/L (Mar–Oct) | tighter | 0.1 mg/L (7 values) | 0.0163× |
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/SC0048313 · MCP: https://passage-data.com/mcp