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Sewage treatment plant, Protivin, Iowa. NPDES permit IA0061352, in force until Sep 30, 2031. Last 12 months: no values over a limit, 8 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | daily minimum | ≥ 6.5 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | Dec |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | Apr |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | Feb |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | Aug |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | Sep |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | May |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | Mar |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | Jan |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | Jun |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | Oct |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | Nov |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | Jul |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | Dec |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | Apr |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | Feb |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | Aug |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | Sep |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | May |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | Mar |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | Jan |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | Jun |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | Oct |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | Nov |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | Jul |
| 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 |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], 30-day average | 3.1 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 8.2 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.1 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.8 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.8 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 12.1 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.1 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 10 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.6 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 8.2 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.1 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 8.2 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 12.1 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.1 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.8 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.8 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.8 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.8 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 10 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.6 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.1 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 12.1 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.8 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.8 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.1 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 10 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.1 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.2 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.6 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 13.3 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.8 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.2 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 51.2 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 1.8 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.2 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.1 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.1 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 12.1 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 1.8 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.8 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 1.8 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.8 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.6 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 10 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5.6 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 21.6 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.8 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 1.8 mg/L (Aug) | new | — | — |
| Solids, total suspended, 30-day average | 5 mg/L (Mar) | tighter | — | — |
| Solids, total suspended, 30-day average | 5 mg/L (Jan) | tighter | — | — |
| Solids, total suspended, 30-day average | 5 mg/L (Dec) | tighter | — | — |
| Solids, total suspended, 30-day average | 5 mg/L (Nov) | tighter | — | — |
| Solids, total suspended, 30-day average | 5 mg/L (Oct) | tighter | — | — |
| Solids, total suspended, 30-day average | 5 mg/L (Feb) | tighter | — | — |
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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