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Sewage treatment plant, Montpelier, Iowa. NPDES permit IA0073890, in force until Nov 30, 2028. Last 12 months: over a limit once (last May 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit |
|---|---|---|---|
| May 2026 | pH, daily maximum | 9.2 | ≤ 9 SU |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| 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 | report only (lb/d) | all year |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | all year |
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| pH | 30-day average | report only (SU) | all year |
| pH | daily maximum | report only (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 |
| Solids, total suspended | 30-day average | ≤ 59 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 88 lb/d | all year |
| Solids, total suspended | 30-day average | report only (mg/L) | all year |
| Solids, total suspended | daily maximum | report only (mg/L) | all year |
| Solids, total suspended | 30-day average | report only (lb/d) | all year |
| Solids, total suspended | daily maximum | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12633 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12607 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10590 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8699 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8685 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8671 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8738 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10587 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15490 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10525 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8683 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10569 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12633 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12607 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10590 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8699 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8685 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8671 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8738 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10587 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15490 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10525 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8683 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10569 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9293 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9274 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7790 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6399 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6388 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6378 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6428 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7788 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11394 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7742 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6387 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7775 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9293 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9274 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7790 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6399 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6388 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6378 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6428 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7788 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11394 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7742 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6387 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7775 lb/d | Jul |
| E. coli | geometric mean | ≤ 127 #/100mL | Mar–Nov |
| 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 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 18 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 29 lb/d | all year |
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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