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Sewage treatment plant, Woolstock, Iowa. NPDES permit IA0061310, in force until Jul 31, 2029. Last 12 months: over a limit 7 times (last June 2026), 2 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | BOD, carbonaceous [5 day, 20 C], 30-day average | 29 | ≤ 25 mg/L | 16% |
| October 2025 | Nitrogen, ammonia total [as N], 30-day average | 5.96 | ≤ 2.4 mg/L | 148% |
| October 2025 | Nitrogen, ammonia total [as N], daily maximum | 5.96 | ≤ 2.4 mg/L | 148% |
| November 2025 | Nitrogen, ammonia total [as N], 30-day average | 8.36 | ≤ 2.4 mg/L | 248% |
| November 2025 | Nitrogen, ammonia total [as N], daily maximum | 8.36 | ≤ 2.4 mg/L | 248% |
| June 2026 | Nitrogen, ammonia total [as N], 30-day average | 5.85 | ≤ 3.2 mg/L | 83% |
| June 2026 | Nitrogen, ammonia total [as N], daily maximum | 5.85 | ≤ 3.2 mg/L | 83% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 3.3 mg/L | all year |
| pH | daily minimum | ≥ 6.5 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.4 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.4 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.2 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.5 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.9 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.6 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.4 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.2 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.5 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.4 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.4 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.4 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.4 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.5 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.4 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.4 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.4 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.3 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.4 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.1 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.9 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.4 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.9 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.6 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 14.6 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.1 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.9 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.7 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.5 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.1 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.9 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11.9 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 45.4 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19.3 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.1 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.1 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.4 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.1 lb/d | Aug |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | all year |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Chloride [as Cl], 30-day average | 1073 lb/d | new | — | — |
| Chloride [as Cl], 30-day average | 412 mg/L | new | — | — |
| Chloride [as Cl], daily maximum | 1646 lb/d | new | — | — |
| Chloride [as Cl], daily maximum | 632 mg/L | new | — | — |
| E. coli, geometric mean | 126 #/100mL (Mar–Nov) | new | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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