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Sewage treatment plant, Salem, South Dakota. NPDES permit SD0020966 expired Jun 30, 2024; its limits still apply. Last 12 months: over a limit once (last April 2026), 2 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| April 2026 | Nitrogen, ammonia total [as N], 30-day average | 3.275 mg/L | ≤ 2.5 mg/L | 31% |
| 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 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Solids, total suspended | 30-day average | ≤ 90 mg/L | all year |
| Solids, total suspended | maximum 7-day average | ≤ 135 mg/L | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.5 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.7 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.6 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.1 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.6 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.2 mg/L | May, Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.6 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.8 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.4 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.6 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.6 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 mg/L | May, Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.6 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11.6 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 mg/L | Jul |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| 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 |
| Flowing, Receiving Stream | daily maximum | report only (N=0;Y=1) | all year |
| Duration of discharge | monthly total | report only (d) | 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/SD0020966 · MCP: https://passage-data.com/mcp