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Sewage treatment plant, Carroll, Iowa. NPDES permit IA0081639 expired Jul 31, 2026; its limits still apply. Last 12 months: over a limit 3 times (last April 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| April 2026 | Nitrogen, ammonia total [as N], 30-day average | .945922 | ≤ .8 lb/d | 18% |
| April 2026 | Nitrogen, ammonia total [as N], 30-day average | 21.4 | ≤ 13 mg/L | 65% |
| April 2026 | Nitrogen, ammonia total [as N], daily maximum | 21.4 | ≤ 20.1 mg/L | 6% |
| 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 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 2 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 4 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 | ≤ 13 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 20.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16.5 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.7 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.5 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.9 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 19 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.1 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 20.6 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 20.4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.1 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.1 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.3 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.5 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22.6 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19.6 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.1 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.6 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.7 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.3 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ .8 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ .5 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ .5 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ .7 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.4 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.8 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.6 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ .5 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ .5 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.7 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.7 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.8 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.8 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.7 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.6 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.8 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.8 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.7 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.6 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.8 lb/d | Sep |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 9.5 lb/d | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 15.6 lb/d | all year |
| E. coli | geometric mean | ≤ 126 #/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 | ≤ 2 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 3 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
Your permit document is the final word. As JSON: /api/v1/permits/IA0081639 · MCP: https://passage-data.com/mcp