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Sewage treatment plant, Viborg, South Dakota. NPDES permit SD0020541, in force until Dec 31, 2028. Last 12 months: over a limit 2 times (last April 2026), 3 required values missing, 7 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| March 2026 | Nitrogen, ammonia total [as N], daily maximum | 14.7 mg/L | ≤ 8.4 mg/L | 75% |
| April 2026 | Nitrogen, ammonia total [as N], daily maximum | 11.6 mg/L | ≤ 7.2 mg/L | 61% |
| 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 | ≤ 7.5 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.6 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.3 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.5 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.1 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.5 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.5 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.1 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.8 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.1 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.2 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.1 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.8 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.1 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Feb |
| 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 |
| Duration of discharge | monthly total | report only (d) | all year |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], 30-day average | 1.5 mg/L (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.1 mg/L (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.1 mg/L (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.3 mg/L (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1 mg/L (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.6 mg/L (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1 mg/L (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.5 mg/L (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1 mg/L (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1 mg/L (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.4 mg/L (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.6 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5 mg/L (Sep) | tighter | — | — |
Cited limits by parameter: South Dakota's rules and the federal ones.
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