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Industrial Organic Chemicals, Hartley, Iowa. NPDES permit IA0080829, in force until Apr 30, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | daily minimum | ≥ 6.2 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Sulfate, total [as SO4] | 30-day average | ≤ 48883 mg/L | Jun |
| Sulfate, total [as SO4] | 30-day average | ≤ 26211 mg/L | Jul |
| Sulfate, total [as SO4] | 30-day average | ≤ 10230 mg/L | Sep |
| Sulfate, total [as SO4] | 30-day average | ≤ 9195 mg/L | Oct |
| Sulfate, total [as SO4] | 30-day average | ≤ 36736 mg/L | May |
| Sulfate, total [as SO4] | 30-day average | ≤ 15207 mg/L | Aug |
| Sulfate, total [as SO4] | 30-day average | ≤ 9489 mg/L | Nov |
| Sulfate, total [as SO4] | 30-day average | ≤ 36859 mg/L | Apr |
| Sulfate, total [as SO4] | 30-day average | ≤ 6289 mg/L | Mar |
| Sulfate, total [as SO4] | daily maximum | ≤ 48883 mg/L | Jun |
| Sulfate, total [as SO4] | daily maximum | ≤ 26211 mg/L | Jul |
| Sulfate, total [as SO4] | daily maximum | ≤ 10230 mg/L | Sep |
| Sulfate, total [as SO4] | daily maximum | ≤ 9195 mg/L | Oct |
| Sulfate, total [as SO4] | daily maximum | ≤ 36736 mg/L | May |
| Sulfate, total [as SO4] | daily maximum | ≤ 15207 mg/L | Aug |
| Sulfate, total [as SO4] | daily maximum | ≤ 9489 mg/L | Nov |
| Sulfate, total [as SO4] | daily maximum | ≤ 36859 mg/L | Apr |
| Sulfate, total [as SO4] | daily maximum | ≤ 6289 mg/L | Mar |
| Sulfate, total [as SO4] | 30-day average | ≤ 250194 lb/d | Jun |
| Sulfate, total [as SO4] | 30-day average | ≤ 139180 lb/d | Jul |
| Sulfate, total [as SO4] | 30-day average | ≤ 60932 lb/d | Sep |
| Sulfate, total [as SO4] | 30-day average | ≤ 55862 lb/d | Oct |
| Sulfate, total [as SO4] | 30-day average | ≤ 190714 lb/d | May |
| Sulfate, total [as SO4] | 30-day average | ≤ 85300 lb/d | Aug |
| Sulfate, total [as SO4] | 30-day average | ≤ 57300 lb/d | Nov |
| Sulfate, total [as SO4] | 30-day average | ≤ 191319 lb/d | Apr |
| Sulfate, total [as SO4] | 30-day average | ≤ 41635 lb/d | Mar |
| Sulfate, total [as SO4] | daily maximum | ≤ 250194 lb/d | Jun |
| Sulfate, total [as SO4] | daily maximum | ≤ 139180 lb/d | Jul |
| Sulfate, total [as SO4] | daily maximum | ≤ 60932 lb/d | Sep |
| Sulfate, total [as SO4] | daily maximum | ≤ 55862 lb/d | Oct |
| Sulfate, total [as SO4] | daily maximum | ≤ 190714 lb/d | May |
| Sulfate, total [as SO4] | daily maximum | ≤ 85300 lb/d | Aug |
| Sulfate, total [as SO4] | daily maximum | ≤ 57300 lb/d | Nov |
| Sulfate, total [as SO4] | daily maximum | ≤ 191319 lb/d | Apr |
| Sulfate, total [as SO4] | daily maximum | ≤ 41635 lb/d | Mar |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Sulfate, total [as SO4], 30-day average | 190450 lb/d (Apr) | tighter | — | — |
| Sulfate, total [as SO4], 30-day average | 17052 mg/L (Apr) | tighter | — | — |
| Sulfate, total [as SO4], 30-day average | 55776 lb/d (Oct) | tighter | — | — |
| Sulfate, total [as SO4], 30-day average | 4448 mg/L (Mar) | tighter | — | — |
| Sulfate, total [as SO4], 30-day average | 4994 mg/L (Oct) | tighter | — | — |
| Sulfate, total [as SO4], 30-day average | 57418 lb/d (Sep) | tighter | — | — |
| Sulfate, total [as SO4], 30-day average | 5141 mg/L (Sep) | tighter | — | — |
| Sulfate, total [as SO4], 30-day average | 119985 lb/d (Jul) | tighter | — | — |
| Sulfate, total [as SO4], 30-day average | 10743 mg/L (Jul) | tighter | — | — |
| Sulfate, total [as SO4], 30-day average | 73685 lb/d (Aug) | tighter | — | — |
| Sulfate, total [as SO4], 30-day average | 6597 mg/L (Aug) | tighter | — | — |
| Sulfate, total [as SO4], 30-day average | 19601 mg/L (May) | tighter | — | — |
| Sulfate, total [as SO4], 30-day average | 5603 mg/L (Nov) | tighter | — | — |
| Sulfate, total [as SO4], 30-day average | 23648 mg/L (Jun) | tighter | — | — |
| Sulfate, total [as SO4], daily maximum | 190450 lb/d (Apr) | tighter | — | — |
| Sulfate, total [as SO4], daily maximum | 17052 mg/L (Apr) | tighter | — | — |
| Sulfate, total [as SO4], daily maximum | 4448 mg/L (Mar) | tighter | — | — |
| Sulfate, total [as SO4], daily maximum | 4994 mg/L (Oct) | tighter | — | — |
| Sulfate, total [as SO4], daily maximum | 5141 mg/L (Sep) | tighter | — | — |
| Sulfate, total [as SO4], daily maximum | 55776 lb/d (Oct) | tighter | — | — |
| Sulfate, total [as SO4], daily maximum | 57418 lb/d (Sep) | tighter | — | — |
| Sulfate, total [as SO4], daily maximum | 119985 lb/d (Jul) | tighter | — | — |
| Sulfate, total [as SO4], daily maximum | 10743 mg/L (Jul) | tighter | — | — |
| Sulfate, total [as SO4], daily maximum | 73685 lb/d (Aug) | tighter | — | — |
| Sulfate, total [as SO4], daily maximum | 6597 mg/L (Aug) | tighter | — | — |
| Sulfate, total [as SO4], daily maximum | 19601 mg/L (May) | tighter | — | — |
| Sulfate, total [as SO4], daily maximum | 5603 mg/L (Nov) | tighter | — | — |
| Sulfate, total [as SO4], daily maximum | 23648 mg/L (Jun) | tighter | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
Same industry: the 57 Chemicals and Allied Products permits in Iowa.
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