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Sewage treatment plant, Whitewood, South Dakota. NPDES permit SD0021466 expired Feb 28, 2023; its limits still apply. Last 12 months: over a limit once (last March 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| March 2026 | Solids, total suspended, maximum 7-day average | 54.8 mg/L | ≤ 45 mg/L | 22% |
| 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 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year |
| pH | daily minimum | ≥ 6.5 SU | all year |
| pH | daily maximum | ≤ 9 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 |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.8 mg/L | May, Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.5 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.9 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.1 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.8 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ .7 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ .8 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.8 mg/L | May, Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.5 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11.5 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.8 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22.5 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.6 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.8 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.8 mg/L | Sep |
| E. coli, colony forming units [CFU] | 30-day geometric mean | ≤ 630 #/100mL | May–Sep |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 1178 #/100mL | May–Sep |
| Flow, total | monthly total | report only (Mgal) | all year |
| Duration of discharge | monthly total | report only (d) | all year |
| Oil and grease visual | daily maximum | ≤ 0 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/SD0021466 · MCP: https://passage-data.com/mcp