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Sewage treatment plant, major discharger, Dillon, South Carolina. NPDES permit SC0021776, in force until Aug 31, 2028. Last 12 months: over a limit 4 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | E. coli, daily maximum | > 2419.6 | ≤ 349 MPN/100mL | — |
| November 2025 | E. coli, monthly average | > 28.6 | ≤ 126 MPN/100mL | — |
| March 2026 | Nitrogen, ammonia total [as N], weekly average | 3.7 | ≤ 1.5 mg/L | 147% |
| March 2026 | Nitrogen, ammonia total [as N], weekly average | 68.1 | ≤ 50 lb/d | 36% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Stream flow, instantaneous | daily minimum | report only (cfs) | Mar–Oct |
| Oxygen demand, ultimate | monthly average | ≤ 1522 lb/d | Jan, Feb, Nov, Dec |
| Oxygen demand, ultimate | weekly average | report only (lb/d) | Jan, Feb, Nov, Dec |
| Oxygen, dissolved [DO] | minimum | ≥ 6 mg/L | Jan, Feb, Nov, Dec |
| Oxygen, dissolved [DO] | minimum | ≥ 6 mg/L | Mar–Oct |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Jan, Feb, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 10 mg/L | Mar–Oct |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Jan, Feb, Nov, Dec |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 15 mg/L | Mar–Oct |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 1001 lb/d | Jan, Feb, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 334 lb/d | Mar–Oct |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 1501 lb/d | Jan, Feb, Nov, Dec |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 500 lb/d | Mar–Oct |
| pH | minimum | ≥ 6 SU | Mar–Oct |
| pH | minimum | ≥ 6 SU | Jan, Feb, Nov, Dec |
| pH | maximum | ≤ 8.5 SU | Mar–Oct |
| pH | maximum | ≤ 8.5 SU | Jan, Feb, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Mar–Oct |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Mar–Oct |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 1001 lb/d | Mar–Oct |
| Solids, total suspended | monthly average | ≤ 1001 lb/d | Jan, Feb, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 1501 lb/d | Mar–Oct |
| Solids, total suspended | weekly average | ≤ 1501 lb/d | Jan, Feb, Nov, Dec |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Nov, Dec |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Mar–Oct |
| Nitrogen, total [as N] | weekly average | report only (mg/L) | Jan, Feb, Nov, Dec |
| Nitrogen, total [as N] | weekly average | report only (mg/L) | Mar–Oct |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Jan, Feb, Nov, Dec |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Mar–Oct |
| Nitrogen, total [as N] | weekly average | report only (lb/d) | Jan, Feb, Nov, Dec |
| Nitrogen, total [as N] | weekly average | report only (lb/d) | Mar–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 16.68 mg/L | Jan, Feb, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 mg/L | Mar–Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 25.02 mg/L | Jan, Feb, Nov, Dec |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1.5 mg/L | Mar–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 556 lb/d | Jan, Feb, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 33.4 lb/d | Mar–Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 835 lb/d | Jan, Feb, Nov, Dec |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 50 lb/d | Mar–Oct |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jan, Feb, Nov, Dec |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Mar–Oct |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | Jan, Feb, Nov, Dec |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | Mar–Oct |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Jan, Feb, Nov, Dec |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Mar–Oct |
| Phosphorus, total [as P] | weekly average | report only (lb/d) | Jan, Feb, Nov, Dec |
| Phosphorus, total [as P] | weekly average | report only (lb/d) | Mar–Oct |
| Lead, total [as Pb] | monthly average | report only (mg/L) | all year |
| Lead, total [as Pb] | daily maximum | report only (mg/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 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Nov, Dec |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Mar–Oct |
| Flow, in conduit or thru treatment plant | weekly average | report only (MGD) | Jan, Feb, Nov, Dec |
| Flow, in conduit or thru treatment plant | weekly average | report only (MGD) | Mar–Oct |
| Chlorine, total residual | monthly average | ≤ .098 mg/L | Jan, Feb, Nov, Dec |
| Chlorine, total residual | monthly average | ≤ .098 mg/L | Mar–Oct |
| Chlorine, total residual | daily maximum | ≤ .169 mg/L | Jan, Feb, Nov, Dec |
| Chlorine, total residual | daily maximum | ≤ .169 mg/L | Mar–Oct |
| Chlorine, total residual | monthly average | ≤ 3.27 lb/d | Jan, Feb, Nov, Dec |
| Chlorine, total residual | monthly average | ≤ 3.27 lb/d | Mar–Oct |
| Chlorine, total residual | daily maximum | ≤ 5.64 lb/d | Jan, Feb, Nov, Dec |
| Chlorine, total residual | daily maximum | ≤ 5.64 lb/d | Mar–Oct |
| E. coli | monthly average | ≤ 126 MPN/100mL | all year |
| E. coli | daily maximum | ≤ 349 MPN/100mL | all year |
| E. coli | monthly average | ≤ 126 MPN/100mL | all year |
| E. coli | daily maximum | ≤ 800 MPN/100mL | all year |
| Mercury, total [as Hg] | monthly average | report only (mg/L) | all year |
| Mercury, total [as Hg] | daily maximum | report only (mg/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 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | Jan, Feb, Nov, Dec |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | Mar–Oct |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | Mar–Oct |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | Jan, Feb, Nov, Dec |
| 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 |
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | daily maximum | ≤ 0 pass=0;fail=1 | all year |
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily minimum | report only (%) | all year |
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/SC0021776 · MCP: https://passage-data.com/mcp