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Industrial Organic Chemicals, Aurora, South Dakota. NPDES permit SD0027898 expired Sep 30, 2026; its limits still apply. Last 12 months: no values over a limit, 1 of 28 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 001 |
| Flow rate | 30-day average | report only (MGD) | all year | 001 |
| Flow rate | daily maximum | report only (MGD) | all year | 001 |
| Conductivity | 30-day average | report only (umho/cm) | all year | 001 |
| Conductivity | daily maximum | report only (umho/cm) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, nitrate total [as N] | 30-day average | ≤ 50 mg/L | all year | 001 |
| Nitrogen, nitrate total [as N] | daily maximum | ≤ 88 mg/L | all year | 001 |
| Nitrogen, nitrate total [as N] | 30-day average | report only (lb/d) | all year | 001 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (lb/d) | all year | 001 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Selenium, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total recoverable | 30-day average | ≤ 29.28 ug/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ 49.62 ug/L | all year | 001 |
| Floating solids, waste or visible foam-visual | daily maximum | ≤ 0 N=0;Y=1 | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .019 mg/L | all year | 001 |
| Flow, total | total | report only (Mgal) | all year | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 2.8 toxic | all year | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 2.8 toxic | all year | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 2.8 toxic | all year | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 2.8 toxic | all year | 001 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 002 |
| Flow rate | 30-day average | report only (MGD) | all year | 002 |
| Flow rate | daily maximum | report only (MGD) | all year | 002 |
| Conductivity | 30-day average | report only (umho/cm) | all year | 002 |
| Conductivity | daily maximum | report only (umho/cm) | all year | 002 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 002 |
| pH | daily minimum | ≥ 6 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, nitrate total [as N] | 30-day average | ≤ 50 mg/L | all year | 002 |
| Nitrogen, nitrate total [as N] | daily maximum | ≤ 88 mg/L | all year | 002 |
| Nitrogen, nitrate total [as N] | 30-day average | report only (lb/d) | all year | 002 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (lb/d) | all year | 002 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | all year | 002 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 002 |
| Selenium, total recoverable | 30-day average | report only (ug/L) | all year | 002 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Copper, total recoverable | 30-day average | ≤ 29.28 ug/L | all year | 002 |
| Copper, total recoverable | daily maximum | ≤ 49.62 ug/L | all year | 002 |
| Floating solids, waste or visible foam-visual | daily maximum | ≤ 0 N=0;Y=1 | all year | 002 |
| Chlorine, total residual | daily maximum | < .019 mg/L | all year | 002 |
| Flow, total | total | report only (Mgal) | all year | 002 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 2.8 toxic | all year | 002 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 2.8 toxic | all year | 002 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 2.8 toxic | all year | 002 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 2.8 toxic | all year | 002 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 002 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 002 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | 002 |
Cited limits by parameter: South Dakota's rules and the federal ones.
Same industry: the 11 Chemicals and Allied Products permits in South Dakota.
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Your permit document is the final word. As JSON: /api/v1/permits/SD0027898 · MCP: https://passage-data.com/mcp