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Wet Corn Milling, major discharger, Keokuk, Iowa. NPDES permit IA0000256, in force until Jun 30, 2030. Last 12 months: over a limit 26 times (last July 2026), 46 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| November 2025 | 012 | Nickel, total [as Ni], 30-day average | 28.63199 | ≤ 4.172 lb/d | 586% |
| November 2025 | 012 | Nickel, total [as Ni], daily maximum | 144.6756 | ≤ 9.825 lb/d | 1373% |
| November 2025 | 012 | pH, daily maximum | 9.26 | ≤ 9 SU | — |
| December 2025 | 009 | pH, daily minimum | 1 | ≥ 6.2 SU | — |
| December 2025 | 011 | pH, daily maximum | 9.6 | ≤ 9 SU | — |
| December 2025 | 012 | BOD, 5-day, 20 deg. C, daily maximum | 14864.13 | ≤ 11725.5 lb/d | 27% |
| December 2025 | 012 | Nitrogen, ammonia total [as N], daily maximum | 117.5 | ≤ 95.4 mg/L | 23% |
| December 2025 | 012 | Nitrogen, ammonia total [as N], daily maximum | 3674.812 | ≤ 1757 lb/d | 109% |
| December 2025 | 012 | pH, daily minimum | 5.7 | ≥ 6.2 SU | — |
| December 2025 | 012 | pH, daily maximum | 12.4 | ≤ 9 SU | — |
| January 2026 | 009 | pH, daily minimum | 6.1 | ≥ 6.2 SU | — |
| January 2026 | 012 | BOD, 5-day, 20 deg. C, daily maximum | 13045.57 | ≤ 11725.5 lb/d | 11% |
| March 2026 | 009 | pH, daily minimum | 6.01 | ≥ 6.2 SU | — |
| March 2026 | 009 | pH, daily maximum | 9.04 | ≤ 9 SU | — |
| March 2026 | 012 | Phenol, 30-day average | .582865 | ≤ .069 lb/d | 745% |
| March 2026 | 012 | Phenol, daily maximum | .582865 | ≤ .119 lb/d | 390% |
| April 2026 | 009 | pH, daily minimum | 6.1 | ≥ 6.2 SU | — |
| May 2026 | 001 | pH, daily minimum | 1 | ≥ 6.2 SU | — |
| May 2026 | 009 | pH, daily minimum | 6.18 | ≥ 6.2 SU | — |
| May 2026 | 011 | pH, daily minimum | 2.3 | ≥ 6.2 SU | — |
| May 2026 | 012 | Nickel, total [as Ni], 30-day average | 18.09835 | ≤ 4.172 lb/d | 334% |
| May 2026 | 012 | Nickel, total [as Ni], daily maximum | 29.96495 | ≤ 9.825 lb/d | 205% |
| May 2026 | 012 | Nitrogen, ammonia total [as N], daily maximum | 2357.551 | ≤ 1396 lb/d | 69% |
| May 2026 | 012 | pH, daily minimum | 3.9 | ≥ 6.2 SU | — |
| June 2026 | 012 | Nitrogen, ammonia total [as N], daily maximum | 1597.326 | ≤ 1435 lb/d | 11% |
| July 2026 | 012 | BOD, 5-day, 20 deg. C, daily maximum | 16558.48 | ≤ 11725.5 lb/d | 41% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | daily minimum | ≥ 6.2 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 | daily maximum | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 12.5 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 18.8 lb/d | all year | 001 |
| Chlorine, total residual | 30-day average | ≤ .393 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .393 mg/L | all year | 001 |
| Chlorine, total residual | 30-day average | ≤ .638 lb/d | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .638 lb/d | all year | 001 |
| pH | daily minimum | ≥ 6.2 SU | all year | 009 |
| pH | daily maximum | ≤ 9 SU | all year | 009 |
| Chlorine, total residual | 30-day average | ≤ .393 mg/L | all year | 009 |
| Chlorine, total residual | daily maximum | ≤ .393 mg/L | all year | 009 |
| Chlorine, total residual | 30-day average | ≤ 58.3 lb/d | all year | 009 |
| Chlorine, total residual | daily maximum | ≤ 58.3 lb/d | all year | 009 |
| pH | daily minimum | ≥ 6.2 SU | all year | 011 |
| pH | daily maximum | ≤ 9 SU | all year | 011 |
| Chlorine, total residual | 30-day average | ≤ .393 mg/L | all year | 011 |
| Chlorine, total residual | daily maximum | ≤ .393 mg/L | all year | 011 |
| Chlorine, total residual | 30-day average | ≤ 11.5 lb/d | all year | 011 |
| Chlorine, total residual | daily maximum | ≤ 11.5 lb/d | all year | 011 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 3908.5 lb/d | all year | 012 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 11725.5 lb/d | all year | 012 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 012 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 012 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (lb/d) | all year | 012 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | all year | 012 |
| pH | daily minimum | ≥ 6.2 SU | all year | 012 |
| pH | daily maximum | ≤ 9 SU | all year | 012 |
| pH | 30-day average | report only (SU) | all year | 012 |
| pH | daily maximum | report only (SU) | all year | 012 |
| Solids, total suspended | 30-day average | ≤ 4690.2 lb/d | all year | 012 |
| Solids, total suspended | daily maximum | ≤ 18760.8 lb/d | all year | 012 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 012 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 012 |
| Solids, total suspended | 30-day average | report only (lb/d) | all year | 012 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 012 |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | all year | 012 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 012 |
| Nitrogen, total [as N] | 30-day average | report only (lb/d) | all year | 012 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 95.4 mg/L | Dec | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 94.3 mg/L | Oct | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 69.8 mg/L | Aug | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 77.9 mg/L | Jun | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 60 mg/L | Sep | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 77.9 mg/L | Nov | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 76.9 mg/L | May | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 140.4 mg/L | Jan | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 163.9 mg/L | Feb | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 77.9 mg/L | Apr | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 116.2 mg/L | Mar | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 83.5 mg/L | Jul | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 95.4 mg/L | Dec | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 94.3 mg/L | Oct | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 69.8 mg/L | Aug | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 77.9 mg/L | Jun | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 60 mg/L | Sep | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 77.9 mg/L | Nov | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 76.9 mg/L | May | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 140.4 mg/L | Jan | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 163.9 mg/L | Feb | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 77.9 mg/L | Apr | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 116.2 mg/L | Mar | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 83.5 mg/L | Jul | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1757 lb/d | Dec | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1711 lb/d | Oct | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1300 lb/d | Aug | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1435 lb/d | Jun | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1674 lb/d | Sep | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1435 lb/d | Nov | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1396 lb/d | May | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2584 lb/d | Jan | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2917 lb/d | Feb | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1435 lb/d | Apr | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2139 lb/d | Mar | 012 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1529 lb/d | Jul | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1757 lb/d | Dec | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1711 lb/d | Oct | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1300 lb/d | Aug | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1435 lb/d | Jun | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1674 lb/d | Sep | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1435 lb/d | Nov | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1396 lb/d | May | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2584 lb/d | Jan | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2917 lb/d | Feb | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1435 lb/d | Apr | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2139 lb/d | Mar | 012 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1529 lb/d | Jul | 012 |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year | 012 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 012 |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (lb/d) | all year | 012 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (lb/d) | all year | 012 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year | 012 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 012 |
| Phosphorus, total [as P] | 30-day average | report only (lb/d) | all year | 012 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 012 |
| Nickel, total [as Ni] | 30-day average | ≤ 4.172 lb/d | all year | 012 |
| Nickel, total [as Ni] | daily maximum | ≤ 9.825 lb/d | all year | 012 |
| Phenol | 30-day average | ≤ .069 lb/d | all year | 012 |
| Phenol | daily maximum | ≤ .119 lb/d | all year | 012 |
| Chlorine, total residual | 30-day average | ≤ .393 mg/L | all year | 012 |
| Chlorine, total residual | daily maximum | ≤ .393 mg/L | all year | 012 |
| Chlorine, total residual | 30-day average | ≤ 14 lb/d | all year | 012 |
| Chlorine, total residual | daily maximum | ≤ 14 lb/d | all year | 012 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | ≤ 1 N=0;Y=1 | all year | 012 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1 N=0;Y=1 | all year | 012 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Chlorine, total residual, daily maximum outfall 009 | 0.097 mg/L | tighter | 0.14 mg/L (11 values) | 1.44× |
| Chlorine, total residual, daily maximum outfall 012 | 0.097 mg/L | tighter | 0.13 mg/L (11 values) | 1.34× |
| Chlorine, total residual, daily maximum outfall 012 | 2.84 lb/d | tighter | 5.009 lb/d (11 values) | 1.76× |
| Chlorine, total residual, 30-day average outfall 001 | 0.128 lb/d | tighter | 0.01026 lb/d (3 values) | 0.0801× |
| Chlorine, total residual, 30-day average outfall 001 | 0.097 mg/L | tighter | 0.04 mg/L (3 values) | 0.412× |
| Chlorine, total residual, daily maximum outfall 001 | 0.128 lb/d | tighter | 0.01026 lb/d (3 values) | 0.0801× |
| Chlorine, total residual, daily maximum outfall 001 | 0.097 mg/L | tighter | 0.06 mg/L (3 values) | 0.619× |
| Chlorine, total residual, 30-day average outfall 009 | 12.46 lb/d | tighter | 0.7429 lb/d (11 values) | 0.0596× |
| Chlorine, total residual, 30-day average outfall 009 | 0.097 mg/L | tighter | 0.03387 mg/L (11 values) | 0.349× |
| Chlorine, total residual, daily maximum outfall 009 | 12.46 lb/d | tighter | 3.53 lb/d (11 values) | 0.283× |
| Chlorine, total residual, 30-day average outfall 011 | 0.097 mg/L | tighter | — | — |
| Chlorine, total residual, 30-day average outfall 011 | 2.24 lb/d | tighter | — | — |
| Chlorine, total residual, daily maximum outfall 011 | 0.097 mg/L | tighter | — | — |
| Chlorine, total residual, daily maximum outfall 011 | 2.24 lb/d | tighter | — | — |
| Chlorine, total residual, 30-day average outfall 012 | 0.097 mg/L | tighter | 0.03678 mg/L (11 values) | 0.379× |
| Chlorine, total residual, 30-day average outfall 012 | 2.84 lb/d | tighter | 1.343 lb/d (11 values) | 0.473× |
Cited limits by parameter: Iowa's rules and the federal ones.
Same industry: the 48 Food and Kindred Products permits in Iowa.
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