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Sewage treatment plant, Harrisburg, South Dakota. NPDES permit SD0023728, in force until Jun 30, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | all year |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year |
| Flow rate | 30-day average | report only (MGD) | all year |
| Flow rate | daily maximum | report only (MGD) | all year |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | 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 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (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 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Jan, Apr, May, Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.5 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.1 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.8 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.7 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.5 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.5 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Apr, May, Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.5 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.1 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.8 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11.7 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.5 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.5 mg/L | Dec |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| E. coli, colony forming units [CFU] | 30-day geometric mean | ≤ 126 #/100mL | Mar–Nov |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 235 #/100mL | Mar–Nov |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], 30-day average | 6.5 mg/L (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 8.5 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 7.1 mg/L (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.5 mg/L (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.5 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 7.1 mg/L (Aug) | tighter | — | — |
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/SD0023728 · MCP: https://passage-data.com/mcp