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Sewage treatment plant, major discharger, Sturgis, South Dakota. NPDES permit SD0020052 expired Dec 31, 2025; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | all year | 002 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | 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 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year | 002 |
| pH | monthly minimum | ≥ 6 SU | all year | 002 |
| pH | monthly maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | 30-day average | ≤ 110 mg/L | all year | 002 |
| Solids, total suspended | maximum 7-day average | ≤ 165 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, nitrite total [as N] | 30-day average | report only (mg/L) | all year | 002 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, nitrate total [as N] | 30-day average | report only (mg/L) | all year | 002 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Sodium adsorption ratio | daily maximum | ≤ 10 Ratio | all year | 002 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 002 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 002 |
| Sulfate, total [as SO4] | 30-day average | report only (mg/L) | all year | 002 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 002 |
| E. coli, colony forming units [CFU] | 30-day geometric mean | report only (#/100mL) | all year | 002 |
| E. coli, colony forming units [CFU] | 30-day geometric mean | report only (#/100mL) | May–Sep | 002 |
| E. coli, colony forming units [CFU] | daily maximum | report only (#/100mL) | all year | 002 |
| E. coli, colony forming units [CFU] | daily maximum | report only (#/100mL) | May–Sep | 002 |
| Total Amount Land Applied | monthly total | report only (Mgal) | all year | 002 |
| Duration of Land Application | monthly total | report only (d) | 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 |
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | all year | 003 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 003 |
| Flow rate | 30-day average | report only (MGD) | all year | 003 |
| Flow rate | daily maximum | report only (MGD) | all year | 003 |
| Conductivity | 30-day average | report only (umho/cm) | all year | 003 |
| Conductivity | daily maximum | report only (umho/cm) | all year | 003 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 003 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | report only (mg/L) | all year | 003 |
| pH | monthly minimum | report only (SU) | all year | 003 |
| pH | monthly maximum | report only (SU) | all year | 003 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 003 |
| Solids, total suspended | maximum 7-day average | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, nitrite total [as N] | 30-day average | report only (mg/L) | all year | 003 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, nitrate total [as N] | 30-day average | report only (mg/L) | all year | 003 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 003 |
| Sodium adsorption ratio | daily maximum | report only (Ratio) | all year | 003 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 003 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 003 |
| Sulfate, total [as SO4] | 30-day average | report only (mg/L) | all year | 003 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 003 |
| E. coli, colony forming units [CFU] | 30-day geometric mean | report only (#/100mL) | all year | 003 |
| E. coli, colony forming units [CFU] | daily maximum | report only (#/100mL) | all year | 003 |
| Total Amount Land Applied | monthly total | report only (Mgal) | all year | 003 |
| Duration of Land Application | monthly total | report only (d) | all year | 003 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 003 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 003 |
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | all year | 005 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 005 |
| Flow rate | 30-day average | report only (MGD) | all year | 005 |
| Flow rate | daily maximum | report only (MGD) | all year | 005 |
| Conductivity | 30-day average | report only (umho/cm) | all year | 005 |
| Conductivity | daily maximum | report only (umho/cm) | all year | 005 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | all year | 005 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 10 mg/L | all year | 005 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 17.5 mg/L | all year | 005 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 005 |
| pH | daily minimum | ≥ 6.5 SU | all year | 005 |
| pH | daily maximum | ≤ 9 SU | all year | 005 |
| Alkalinity, total [as CaCO3] | 30-day average | report only (mg/L) | all year | 005 |
| Alkalinity, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 005 |
| Solids, total suspended | 30-day average | ≤ 10 mg/L | all year | 005 |
| Solids, total suspended | daily maximum | ≤ 17.5 mg/L | all year | 005 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 005 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 005 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 005 |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | all year | 005 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.3 mg/L | Jan | 005 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.3 mg/L | Feb | 005 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.5 mg/L | Mar | 005 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.5 mg/L | Apr | 005 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.8 mg/L | May | 005 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Jun | 005 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.3 mg/L | Jul | 005 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.2 mg/L | Aug | 005 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.8 mg/L | Sep | 005 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Oct | 005 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.3 mg/L | Nov | 005 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.3 mg/L | Dec | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Jan | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.8 mg/L | Feb | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.5 mg/L | Mar | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.3 mg/L | Apr | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9 mg/L | May | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.1 mg/L | Jun | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | < 8 mg/L | Jul | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | < 7.4 mg/L | Aug | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | < 8 mg/L | Sep | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.7 mg/L | Oct | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.9 mg/L | Nov | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.3 mg/L | Dec | 005 |
| Nitrogen, nitrate total [as N] | 30-day average | report only (mg/L) | all year | 005 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | 005 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year | 005 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 005 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 005 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 005 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 005 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 005 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 005 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Thallium, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Thallium, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Beryllium, total recoverable [as Be] | daily maximum | report only (ug/L) | all year | 005 |
| Beryllium, total recoverable [as Be] | daily maximum | report only (ug/L) | all year | 005 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Molybdenum, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Molybdenum, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Antimony, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Phenols | daily maximum | report only (ug/L) | all year | 005 |
| Phenols | daily maximum | report only (ug/L) | all year | 005 |
| E. coli, colony forming units [CFU] | 30-day geometric mean | ≤ 630 #/100mL | May–Sep | 005 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 1178 #/100mL | May–Sep | 005 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | < 1 tox acute | all year | 005 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | < 1 tox acute | all year | 005 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 1.3 tox chronic | Jan, Feb, Mar, Apr, May, Jun, Jul, Sep, Oct, Nov, Dec | 005 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | ≤ 1.3 tox chronic | Jan, Feb, Mar, Apr, May, Jun, Jul, Sep, Oct, Nov, Dec | 005 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | < 1.1 tox chronic | Aug | 005 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | < 1.1 tox chronic | Aug | 005 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | < 1 tox acute | all year | 005 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | < 1 tox acute | all year | 005 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 1.3 tox chronic | Jan, Feb, Mar, Apr, May, Jun, Jul, Sep, Oct, Nov, Dec | 005 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 1.3 tox chronic | Jan, Feb, Mar, Apr, May, Jun, Jul, Sep, Oct, Nov, Dec | 005 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 1.1 tox chronic | Aug | 005 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 1.1 tox chronic | Aug | 005 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | report only (mg/L) | all year | 005 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 005 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 005 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 005 |
| Oil and grease visual | daily maximum | ≤ 0 abst=0;prst=1 | all year | 005 |
| Temperature, water deg. centigrade | value | report only (deg C) | all year | BBC |
| Temperature, water deg. centigrade | value | report only (deg C) | all year | BBC |
| Streamflow | value | report only (cfs) | all year | BBC |
| Streamflow | value | report only (cfs) | all year | BBC |
| Oxygen, dissolved [DO] | value | report only (mg/L) | all year | BBC |
| Oxygen, dissolved [DO] | value | report only (mg/L) | all year | BBC |
| BOD, 5-day, 20 deg. C | value | report only (mg/L) | all year | BBC |
| BOD, 5-day, 20 deg. C | value | report only (mg/L) | all year | BBC |
| pH | value | report only (SU) | all year | BBC |
| pH | value | report only (SU) | all year | BBC |
| Solids, total suspended | value | report only (mg/L) | all year | BBC |
| Solids, total suspended | value | report only (mg/L) | all year | BBC |
| Nitrogen, ammonia total [as N] | value | report only (mg/L) | all year | BBC |
| Nitrogen, ammonia total [as N] | value | report only (mg/L) | all year | BBC |
| Nitrogen, nitrate total [as N] | value | report only (mg/L) | all year | BBC |
| Nitrogen, nitrate total [as N] | value | report only (mg/L) | all year | BBC |
| E. coli, colony forming units [CFU] | value | report only (#/100mL) | all year | BBC |
| E. coli, colony forming units [CFU] | value | report only (#/100mL) | all year | BBC |
Cited limits by parameter: South Dakota's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/SD0020052 · MCP: https://passage-data.com/mcp