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Sewage treatment plant, major discharger, Rapid City, South Dakota. NPDES permit SD0023574 expired Jun 30, 2022; its limits still apply. Last 12 months: no values over a limit, 1 of 31 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | all year |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year |
| Flow rate | 30-day average | report only (MGD) | all year |
| Flow rate | daily maximum | report only (MGD) | all year |
| Flow rate | 30-day average | report only (cfs) | all year |
| Flow rate | daily maximum | report only (cfs) | all year |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Jan, Feb, Mar, Apr, Dec |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6.5 mg/L | May–Sep |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | Oct, Nov |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Dec |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 24 mg/L | May–Sep |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 28 mg/L | Oct, Nov |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Dec |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 24 mg/L | May–Sep |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 28 mg/L | Oct, Nov |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year |
| pH | daily minimum | ≥ 6.5 SU | all year |
| pH | daily maximum | ≤ 8.3 SU | all year |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year |
| Solids, total suspended | 30-day average | report only (mg/L) | all year |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, nitrate total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Cyanide, weak acid, dissociable | value | report only (ug/L) | all year |
| Cyanide, weak acid, dissociable | value | report only (ug/L) | all year |
| Cyanide, total [as CN] | value | report only (ug/L) | all year |
| Cyanide, total [as CN] | value | report only (ug/L) | all year |
| Hardness, total [as CaCO3] | value | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | value | report only (mg/L) | all year |
| Arsenic, total recoverable | value | report only (ug/L) | all year |
| Arsenic, total recoverable | value | report only (ug/L) | all year |
| Selenium, total recoverable | value | report only (ug/L) | all year |
| Selenium, total recoverable | value | report only (ug/L) | all year |
| Thallium, total recoverable | value | report only (ug/L) | all year |
| Thallium, total recoverable | value | report only (ug/L) | all year |
| Beryllium, total recoverable [as Be] | value | report only (ug/L) | all year |
| Beryllium, total recoverable [as Be] | value | report only (ug/L) | all year |
| Nickel, total recoverable | value | report only (ug/L) | all year |
| Nickel, total recoverable | value | report only (ug/L) | all year |
| Silver total recoverable | value | report only (ug/L) | all year |
| Silver total recoverable | value | report only (ug/L) | all year |
| Zinc, total recoverable | value | report only (ug/L) | all year |
| Zinc, total recoverable | value | report only (ug/L) | all year |
| Cadmium, total recoverable | value | report only (ug/L) | all year |
| Cadmium, total recoverable | value | report only (ug/L) | all year |
| Lead, total recoverable | value | report only (ug/L) | all year |
| Lead, total recoverable | value | report only (ug/L) | all year |
| Chromium, total recoverable | value | report only (ug/L) | all year |
| Chromium, total recoverable | value | report only (ug/L) | all year |
| Copper, total recoverable | value | report only (ug/L) | all year |
| Copper, total recoverable | value | report only (ug/L) | all year |
| Molybdenum, total recoverable | value | report only (ug/L) | all year |
| Molybdenum, total recoverable | value | report only (ug/L) | all year |
| Antimony, total recoverable | value | report only (ug/L) | all year |
| Antimony, total recoverable | value | report only (ug/L) | all year |
| Phenols | value | report only (ug/L) | all year |
| Phenols | value | report only (ug/L) | all year |
| E. coli, colony forming units [CFU] | 30-day geometric mean | ≤ 126 #/100mL | May–Sep |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 235 #/100mL | May–Sep |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 2 tox chronic | Jan |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 1.2 tox chronic | Oct |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 1.9 tox chronic | Nov |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 2.2 tox chronic | Dec |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 2.3 tox chronic | Feb |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 2.4 tox chronic | Mar |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 1.8 tox chronic | Apr |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 1.4 tox chronic | May |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 1.3 tox chronic | Jun |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 1.3 tox chronic | Jul |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 1.2 tox chronic | Aug |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 1.2 tox chronic | Sep |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 2 tox chronic | Jan |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1.2 tox chronic | Oct |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1.9 tox chronic | Nov |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 2.2 tox chronic | Dec |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 2.3 tox chronic | Feb |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 2.4 tox chronic | Mar |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1.8 tox chronic | Apr |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1.4 tox chronic | May |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1.3 tox chronic | Jun |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1.3 tox chronic | Jul |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1.2 tox chronic | Aug |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1.2 tox chronic | Sep |
| Mercury, total recoverable | value | report only (ug/L) | all year |
| Mercury, total recoverable | value | report only (ug/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year |
| Report due [yrmoda] | daily maximum | report only (N=0;Y=1) | all year |
| Report due [yrmoda] | daily maximum | report only (N=0;Y=1) | all year |
| Report due [yrmoda] | daily maximum | report only (N=0;Y=1) | all year |
| Report due [yrmoda] | daily maximum | report only (N=0;Y=1) | all year |
| Report due [yrmoda] | daily maximum | report only (N=0;Y=1) | all year |
| Report due [yrmoda] | daily maximum | report only (N=0;Y=1) | all year |
Cited limits by parameter: South Dakota'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/SD0023574 · MCP: https://passage-data.com/mcp