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Sewage treatment plant, major discharger, Box Elder, South Dakota. NPDES permit SD0028611, in force until Mar 31, 2031. Last 12 months: over a limit 4 times (last October 2025). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Nitrogen, ammonia total [as N], 30-day average | 1.8 mg/L | ≤ 1.6 mg/L | 13% |
| October 2025 | Nitrogen, ammonia total [as N], daily maximum | 10.3 mg/L | ≤ 2.5 mg/L | 312% |
| October 2025 | Toxicity [chronic], Ceriodaphnia dubia, daily maximum | 1.11 toxic | ≤ 1.07 toxic | 4% |
| October 2025 | pH, daily minimum | 5 SU | ≥ 6 SU | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 001 |
| Flow rate | 30-day average | report only (MGD) | all year | 001 |
| Flow rate | daily maximum | report only (MGD) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.5 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.2 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.6 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.3 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ .7 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.2 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.9 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.5 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.2 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.6 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.8 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.7 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.5 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.5 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.5 mg/L | Oct | 001 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Cyanide, free [as free] | value | report only (ug/L) | all year | 001 |
| Cyanide, free [as free] | value | report only (ug/L) | all year | 001 |
| Cyanide, weak acid, dissociable | value | report only (ug/L) | all year | 001 |
| Cyanide, weak acid, dissociable | value | report only (ug/L) | all year | 001 |
| Cyanide, total [as CN] | value | report only (ug/L) | all year | 001 |
| Cyanide, total [as CN] | value | report only (ug/L) | all year | 001 |
| Hardness, total [as CaCO3] | value | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | value | report only (mg/L) | all year | 001 |
| Arsenic, total recoverable | value | report only (ug/L) | all year | 001 |
| Arsenic, total recoverable | value | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Thallium, total recoverable | value | report only (ug/L) | all year | 001 |
| Thallium, total recoverable | value | report only (ug/L) | all year | 001 |
| Beryllium, total recoverable [as Be] | value | report only (ug/L) | all year | 001 |
| Beryllium, total recoverable [as Be] | value | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | value | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | value | report only (ug/L) | all year | 001 |
| Silver total recoverable | value | report only (ug/L) | all year | 001 |
| Silver total recoverable | value | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | value | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | value | report only (ug/L) | all year | 001 |
| Aluminum, total recoverable | value | report only (ug/L) | all year | 001 |
| Aluminum, total recoverable | value | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | value | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | value | report only (ug/L) | all year | 001 |
| Lead, total recoverable | value | report only (ug/L) | all year | 001 |
| Lead, total recoverable | value | report only (ug/L) | all year | 001 |
| Chromium, total recoverable | value | report only (ug/L) | all year | 001 |
| Chromium, total recoverable | value | report only (ug/L) | all year | 001 |
| Copper, total recoverable | value | report only (ug/L) | all year | 001 |
| Copper, total recoverable | value | report only (ug/L) | all year | 001 |
| Molybdenum, total recoverable | value | report only (ug/L) | all year | 001 |
| Molybdenum, total recoverable | value | report only (ug/L) | all year | 001 |
| Antimony, total recoverable | value | report only (ug/L) | all year | 001 |
| Antimony, total recoverable | value | report only (ug/L) | all year | 001 |
| Phenols | value | report only (ug/L) | all year | 001 |
| Phenols | value | report only (ug/L) | all year | 001 |
| E. coli, colony forming units [CFU] | 30-day geometric mean | ≤ 630 #/100mL | May–Sep | 001 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 1178 #/100mL | May–Sep | 001 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | < 1 tox acute | all year | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | < 1.3 tox chronic | all year | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | < 1 tox acute | all year | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 1.3 tox chronic | all year | 001 |
| Mercury, total recoverable | value | report only (ug/L) | all year | 001 |
| Mercury, total recoverable | value | report only (ug/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 001 |
| BOD, 5-day, percent removal | monthly minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly minimum | ≥ 85 % | all year | 001 |
| Oil and grease visual | daily maximum | ≤ 0 abst=0;prst=1 | all year | 001 |
| Report due [yrmoda] | value | ≤ 0 Y=0;N=1 | all year | 001 |
| Report due [yrmoda] | value | ≤ 0 Y=0;N=1 | all year | 001 |
| Report due [yrmoda] | value | ≤ 0 Y=0;N=1 | all year | 001 |
| Report due [yrmoda] | value | ≤ 0 Y=0;N=1 | all year | 001 |
| Temperature, water deg. fahrenheit | value | report only (deg F) | Apr–Oct | 002 |
| Conductivity | value | report only (umho/cm) | Apr–Oct | 002 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | Apr–Nov | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 45 mg/L | Apr–Nov | 002 |
| pH | value | report only (SU) | Apr–Oct | 002 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | Apr–Nov | 002 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | Apr–Nov | 002 |
| Nitrogen, ammonia total [as N] | value | report only (mg/L) | Apr–Oct | 002 |
| Nitrogen, nitrite total [as N] | value | report only (mg/L) | Apr–Oct | 002 |
| Nitrogen, nitrate total [as N] | value | report only (mg/L) | Apr–Oct | 002 |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | Apr–Oct | 002 |
| Phosphorus, total [as P] | value | report only (mg/L) | Apr–Oct | 002 |
| Sodium adsorption ratio | value | report only (Ratio) | Apr–Oct | 002 |
| Chloride [as Cl] | value | report only (mg/L) | Apr–Oct | 002 |
| Sulfate, total [as SO4] | value | report only (mg/L) | Apr–Oct | 002 |
| E. coli, colony forming units [CFU] | value | report only (#/100mL) | Apr–Oct | 002 |
| Flow, irrigation | value | report only (MGD) | Apr–Nov | 002 |
| Total Amount Land Applied | monthly total | report only (Mgal) | Apr–Nov | 002 |
| Duration of Land Application | monthly total | report only (d) | Apr–Oct | 002 |
| Solids, total dissolved | value | report only (mg/L) | Apr–Oct | 002 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Selenium, total recoverable, 30-day average | 5 ug/L | new | — | — |
| Selenium, total recoverable, daily maximum | 12.8 ug/L | new | 5 ug/L (3 values, 1 below detection) | 0.391× |
Cited limits by parameter: South Dakota's rules and the federal ones.
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