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Sewage treatment plant, major discharger, Mitchell, South Dakota. NPDES permit SD0023361, in force until Dec 31, 2029. Last 12 months: no values over a limit, 1 required value missing, 2 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Flow rate | 30-day average | report only (MGD) | all year | 001 |
| Flow rate | daily maximum | report only (MGD) | all year | 001 |
| Flow rate | 30-day average | report only (cfs) | all year | 001 |
| Flow rate | daily maximum | report only (cfs) | 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 |
| pH | daily minimum | ≥ 6.5 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 |
| 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 | report only (mg/L) | Jan, Feb, Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Mar, Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | May–Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Mar, Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | May–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 477 lb/d | Jan, Feb, Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 143 lb/d | Mar, Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 80 lb/d | May–Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 107 lb/d | Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 115 lb/d | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1041 lb/d | Jan, Feb, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 468 lb/d | Mar, Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 141 lb/d | May–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 201 lb/d | Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 201 lb/d | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Jan, Feb, Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | May–Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | May–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 917 lb/d | Jan, Feb, Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 309 lb/d | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 309 lb/d | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 192 lb/d | May–Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 205 lb/d | Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 289 lb/d | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2091 lb/d | Jan, Feb, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1015 lb/d | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 655 lb/d | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 354 lb/d | May–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 522 lb/d | Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 522 lb/d | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Jan, Feb, Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | May–Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | May–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1849 lb/d | Jan, Feb, Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 604 lb/d | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 594 lb/d | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 306 lb/d | May–Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 323 lb/d | Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 466 lb/d | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3239 lb/d | Jan, Feb, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2523 lb/d | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1068 lb/d | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 572 lb/d | May–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 849 lb/d | Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 849 lb/d | Nov | 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, 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] | daily minimum | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily minimum | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily minimum | 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 | value | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | value | 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 | 30-day average | report only (ug/L) | all year | 001 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total recoverable | value | report only (ug/L) | all year | 001 |
| Copper, total recoverable | 30-day average | ≤ 3419 lb/d | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ 5795 lb/d | all year | 001 |
| Copper, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Copper, total recoverable | daily maximum | 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 |
| Flow, total | monthly total | report only (Mgal) | all year | 001 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | < 1 tox acute | all year | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | < 1 tox acute | 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 |
| Duration of discharge | monthly total | report only (d) | all year | 001 |
| Oil and grease visual | daily maximum | ≤ 0 abst=0;prst=1 | all year | 001 |
| Report due [yrmoda] | value | report only (N=0;Y=1) | all year | 001 |
| Report due [yrmoda] | value | report only (N=0;Y=1) | all year | 001 |
| Report due [yrmoda] | value | ≤ 0 Y=0;N=1 | all year | 001 |
| Report due [yrmoda] | value | report only (N=0;Y=1) | all year | 001 |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | Apr–Oct | 002 |
| Flow rate | 30-day average | report only (MGD) | Apr–Oct | 002 |
| Flow rate | monthly maximum | report only (MGD) | Apr–Oct | 002 |
| Conductivity | monthly maximum | report only (umho/cm) | Apr–Oct | 002 |
| BOD, 5-day, 20 deg. C | monthly maximum | report only (mg/L) | Apr–Oct | 002 |
| pH | monthly minimum | report only (SU) | Apr–Oct | 002 |
| pH | monthly maximum | report only (SU) | Apr–Oct | 002 |
| Solids, total suspended | monthly maximum | report only (mg/L) | Apr–Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly maximum | report only (mg/L) | Apr–Oct | 002 |
| Nitrogen, nitrite total [as N] | monthly maximum | report only (mg/L) | Apr–Oct | 002 |
| Nitrogen, nitrate total [as N] | monthly maximum | report only (mg/L) | Apr–Oct | 002 |
| Nitrogen, Kjeldahl, total [as N] | monthly maximum | report only (mg/L) | Apr–Oct | 002 |
| Phosphorus, total [as P] | monthly maximum | report only (mg/L) | Apr–Oct | 002 |
| Sodium adsorption ratio | monthly maximum | report only (Ratio) | Apr–Oct | 002 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | Apr–Oct | 002 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | Apr–Oct | 002 |
| E. coli, colony forming units [CFU] | monthly maximum | report only (#/100mL) | Apr–Oct | 002 |
| Total Amount Land Applied | monthly total | report only (Mgal) | Apr–Oct | 002 |
| Duration of Land Application | monthly total | report only (d) | Apr–Oct | 002 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | Apr–Oct | 002 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], 30-day average | 165 lb/d (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 279 lb/d (Jan, Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 712 lb/d (Jan, Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 92 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 92 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 90 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 80 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 122 lb/d (Jul–Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 294 lb/d (Oct, Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 159 lb/d (May, Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 50 lb/d (Jul–Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 279 lb/d (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 82 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 196 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 744 lb/d (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 1295 lb/d (Jan, Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 448 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 141 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 537 lb/d (Jul–Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 207 lb/d (Jul–Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 354 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 986 lb/d (Apr) | tighter | — | — |
Cited limits by parameter: South Dakota's rules and the federal ones.
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