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Sewage treatment plant, major discharger, Huron, South Dakota. NPDES permit SD0023434, in force until Jun 30, 2027. 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 | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Flow rate | 30-day average | report only (MGD) | all year | 001 |
| Flow rate | daily maximum | report only (MGD) | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (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, ammonia total [as N] | 30-day average | ≤ 82 lb/d | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 59 lb/d | Aug, Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 144 lb/d | Jan, Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 114 lb/d | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 63 lb/d | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 60 lb/d | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 123 lb/d | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 55 lb/d | Oct–Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 382 lb/d | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 268 lb/d | Aug, Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 658 lb/d | Jan, Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 439 lb/d | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 288 lb/d | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 273 lb/d | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 439 lb/d | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 275 lb/d | Oct–Dec | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Cyanide, weak acid, dissociable | value | report only (ug/L) | all year | 001 |
| Cyanide, weak acid, dissociable | value | report only (ug/L) | all year | 001 |
| Cyanide, total [as CN] | value | report only (ug/L) | all year | 001 |
| Cyanide, total [as CN] | value | report only (ug/L) | all year | 001 |
| Hardness, total [as CaCO3] | value | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | value | report only (mg/L) | all year | 001 |
| Arsenic, total recoverable | value | report only (ug/L) | all year | 001 |
| Arsenic, total recoverable | value | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | value | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | value | report only (ug/L) | all year | 001 |
| Thallium, total recoverable | value | report only (ug/L) | all year | 001 |
| Thallium, total recoverable | value | report only (ug/L) | all year | 001 |
| Beryllium, total recoverable [as Be] | value | report only (ug/L) | all year | 001 |
| Beryllium, total recoverable [as Be] | value | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | value | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | value | report only (ug/L) | all year | 001 |
| Silver total recoverable | value | report only (ug/L) | all year | 001 |
| Silver total recoverable | value | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | value | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | value | report only (ug/L) | all year | 001 |
| Aluminum, total recoverable | value | report only (ug/L) | all year | 001 |
| Aluminum, total recoverable | value | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | value | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | value | report only (ug/L) | all year | 001 |
| Lead, total recoverable | value | report only (ug/L) | all year | 001 |
| Lead, total recoverable | value | report only (ug/L) | all year | 001 |
| Chromium, total recoverable | value | report only (ug/L) | all year | 001 |
| Chromium, total recoverable | value | report only (ug/L) | all year | 001 |
| Copper, total recoverable | value | report only (ug/L) | all year | 001 |
| Copper, total recoverable | value | report only (ug/L) | all year | 001 |
| Molybdenum, total recoverable | value | report only (ug/L) | all year | 001 |
| Molybdenum, total recoverable | value | report only (ug/L) | all year | 001 |
| Antimony, total recoverable | value | report only (ug/L) | all year | 001 |
| Antimony, total recoverable | value | report only (ug/L) | all year | 001 |
| Phenols | value | report only (ug/L) | all year | 001 |
| Phenols | value | report only (ug/L) | all year | 001 |
| E. coli, colony forming units [CFU] | 30-day geometric mean | ≤ 630 #/100mL | May–Sep | 001 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 1178 #/100mL | May–Sep | 001 |
| Flow, total | monthly total | report only (Mgal) | all year | 001 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | < 1 tox acute | all year | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | < 1 tox acute | all year | 001 |
| Mercury, total recoverable | value | report only (ug/L) | all year | 001 |
| Mercury, total recoverable | value | report only (ug/L) | all year | 001 |
| Duration of discharge | monthly total | report only (d) | all year | 001 |
| Oil and grease visual | daily maximum | < 1 abst=0;prst=1 | all year | 001 |
| Report due [yrmoda] | value | report only (Y=0;N=1) | all year | 001 |
| Report due [yrmoda] | value | report only (Y=0;N=1) | all year | 001 |
| Report due [yrmoda] | value | report only (Y=0;N=1) | all year | 001 |
| Report due [yrmoda] | value | < 1 Y=0;N=1 | all year | 001 |
| 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 |
| 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 | daily minimum | ≥ 6 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Flow, total | monthly total | report only (Mgal) | all year | 002 |
| Duration of discharge | monthly total | report only (d) | 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 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year | 003 |
| pH | daily minimum | ≥ 6 SU | all year | 003 |
| pH | daily maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 003 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 003 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 003 |
| Flow, total | monthly total | report only (Mgal) | all year | 003 |
| Duration of discharge | monthly total | report only (d) | all year | 003 |
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/SD0023434 · MCP: https://passage-data.com/mcp