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Cheese, Natural And Processed, Lake Norden, South Dakota. NPDES permit SD0025411, in force until Jun 30, 2031. Last 12 months: over a limit 24 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Alkalinity, total [as CaCO3], 30-day average | 954 mg/L | ≤ 750 mg/L | 27% |
| October 2025 | Conductivity, 30-day average | 4122 umho/cm | ≤ 1560 umho/cm | 164% |
| October 2025 | Solids, total dissolved, 30-day average | 2527 mg/L | ≤ 2500 mg/L | 1% |
| November 2025 | Alkalinity, total [as CaCO3], 30-day average | 944 mg/L | ≤ 750 mg/L | 26% |
| November 2025 | Conductivity, 30-day average | 4032 umho/cm | ≤ 1560 umho/cm | 158% |
| December 2025 | Alkalinity, total [as CaCO3], 30-day average | 943 mg/L | ≤ 750 mg/L | 26% |
| December 2025 | Conductivity, 30-day average | 3754 umho/cm | ≤ 1560 umho/cm | 141% |
| December 2025 | Solids, total suspended, 30-day average | 340 lb/d | ≤ 337 lb/d | 1% |
| December 2025 | Solids, total suspended, daily maximum | 1529 lb/d | ≤ 670 lb/d | 128% |
| January 2026 | Alkalinity, total [as CaCO3], 30-day average | 927 mg/L | ≤ 750 mg/L | 24% |
| January 2026 | Conductivity, 30-day average | 3419 umho/cm | ≤ 1560 umho/cm | 119% |
| February 2026 | Alkalinity, total [as CaCO3], 30-day average | 910 mg/L | ≤ 750 mg/L | 21% |
| February 2026 | Conductivity, 30-day average | 3470 umho/cm | ≤ 1560 umho/cm | 122% |
| March 2026 | Alkalinity, total [as CaCO3], 30-day average | 913 mg/L | ≤ 750 mg/L | 22% |
| March 2026 | Conductivity, 30-day average | 3503 umho/cm | ≤ 1560 umho/cm | 125% |
| March 2026 | Toxicity [acute], Pimephales promelas [Fathead Minnow], daily maximum | 1.3 tox acute | < 1 tox acute | 30% |
| April 2026 | Alkalinity, total [as CaCO3], 30-day average | 912 mg/L | ≤ 750 mg/L | 22% |
| April 2026 | Conductivity, 30-day average | 3450 umho/cm | ≤ 1560 umho/cm | 121% |
| May 2026 | Alkalinity, total [as CaCO3], 30-day average | 860 mg/L | ≤ 750 mg/L | 15% |
| May 2026 | Conductivity, 30-day average | 3632 umho/cm | ≤ 1560 umho/cm | 133% |
| June 2026 | Alkalinity, total [as CaCO3], 30-day average | 942 mg/L | ≤ 750 mg/L | 26% |
| June 2026 | Conductivity, 30-day average | 3389 umho/cm | ≤ 1560 umho/cm | 117% |
| July 2026 | Toxicity [acute], Pimephales promelas [Fathead Minnow], daily maximum | 1.4 tox acute | < 1 tox acute | 40% |
| August 2026 | Toxicity [chronic], Ceriodaphnia dubia, daily maximum | 3.8 tox chronic | < 2.3 tox chronic | 65% |
| 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 |
| Conductivity | 30-day average | ≤ 4375 umho/cm | Apr–Oct |
| Conductivity | 30-day average | ≤ 7000 umho/cm | Jan, Feb, Mar, Nov, Dec |
| Conductivity | daily maximum | ≤ 4375 umho/cm | Apr–Oct |
| Conductivity | daily maximum | ≤ 7000 umho/cm | Jan, Feb, Mar, Nov, Dec |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | all year |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 269 lb/d | all year |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 538 lb/d | all year |
| pH | daily minimum | ≥ 6.5 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Alkalinity, total [as CaCO3] | 30-day average | ≤ 1255 mg/L | all year |
| Alkalinity, total [as CaCO3] | daily maximum | ≤ 1313 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 90 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 158 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 337 lb/d | all year |
| Solids, total suspended | daily maximum | ≤ 670 lb/d | all year |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | 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 | ≤ 1.5 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.8 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.6 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.8 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ .6 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ .5 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.5 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.2 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.4 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.5 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.5 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.4 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.1 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ .8 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.1 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.5 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.5 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.4 mg/L | Sep |
| Nitrogen, nitrate total [as N] | 30-day average | ≤ 18 mg/L | all year |
| Nitrogen, nitrate total [as N] | daily maximum | ≤ 31.5 mg/L | all year |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | < 1 tox acute | all year |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | < 2.4 tox chronic | Mar |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | < 3.3 tox chronic | Jun |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | < 3.3 tox chronic | Nov |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | < 3.1 tox chronic | Sep |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | < 2.2 tox chronic | Dec |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | < 2.2 tox chronic | Feb |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | < 5 tox chronic | May |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | < 2.3 tox chronic | Jul |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | < 3.3 tox chronic | Oct |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | < 2.3 tox chronic | Aug |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | < 2.7 tox chronic | Jan |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | < 5.5 tox chronic | Apr |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | < 1 tox acute | all year |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 2.3 tox chronic | Jul |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 2.3 tox chronic | Aug |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 2.2 tox chronic | Feb |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 2.7 tox chronic | Jan |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 3.1 tox chronic | Sep |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 3.3 tox chronic | Jun |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 2.2 tox chronic | Dec |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 2.4 tox chronic | Mar |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 3.3 tox chronic | Oct |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 5 tox chronic | May |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 3.3 tox chronic | Nov |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | < 5.5 tox chronic | Apr |
| Solids, total dissolved | 30-day average | ≤ 4315 mg/L | all year |
| Solids, total dissolved | daily maximum | ≤ 4375 mg/L | all year |
| Oil and grease visual | daily maximum | report only (abst=0;prst=1) | all year |
Cited limits by parameter: South Dakota's rules and the federal ones.
Same industry: the 7 Food and Kindred Products permits in South Dakota.
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On EPA ECHO: Facility report · DMR history
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