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Sewage treatment plant, major discharger, Milbank, South Dakota. NPDES permit SD0020371 expired Mar 31, 2009; its limits still apply. Last 12 months: no values over a limit, 4 required values missing, 2 of 23 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 |
| Conductivity | 30-day average | report only (umho/cm) | all year |
| Conductivity | daily maximum | report only (umho/cm) | all year |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Apr |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6.5 mg/L | May–Sep |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6.5 mg/L | Oct |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6.5 mg/L | Jan, Feb, Mar, Nov, Dec |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | Apr |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | May–Sep |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | Oct |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | Jan, Feb, Mar, Nov, Dec |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 30 mg/L | Apr |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 20 mg/L | May–Sep |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 20 mg/L | Oct |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 30 mg/L | Jan, Feb, Mar, Nov, Dec |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year |
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Alkalinity, total [as CaCO3] | 30-day average | report only (mg/L) | all year |
| Alkalinity, total [as CaCO3] | daily maximum | report only (mg/L) | 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, ammonia total [as N] | 30-day average | ≤ 2 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.6 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.4 mg/L | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.4 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.9 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | Jan, Feb, Mar, Nov, Dec |
| 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 |
| Chlorine, total residual | daily maximum | ≤ .019 mg/L | all year |
| Coliform, fecal general | 30-day geometric mean | ≤ 1000 #/100mL | May–Sep |
| Coliform, fecal general | daily maximum | ≤ 2000 #/100mL | May–Sep |
| 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 |
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum | ≥ 67 % | Apr |
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum | ≥ 63 % | May–Sep |
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum | ≥ 55 % | Oct |
| IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum | ≥ 53 % | Jan, Feb, Mar, Nov, Dec |
| IC25 Static Renewal 7 Day Chronic Pimephales | minimum | ≥ 67 % | Apr |
| IC25 Static Renewal 7 Day Chronic Pimephales | minimum | ≥ 63 % | May–Sep |
| IC25 Static Renewal 7 Day Chronic Pimephales | minimum | ≥ 55 % | Oct |
| IC25 Static Renewal 7 Day Chronic Pimephales | minimum | ≥ 53 % | Jan, Feb, Mar, Nov, Dec |
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/SD0020371 · MCP: https://passage-data.com/mcp