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Sewage treatment plant, major discharger, Adel, Iowa. NPDES permit IA0041921, in force until Nov 30, 2027. Last 12 months: over a limit once (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| September 2026 | Nitrogen, ammonia total [as N], 30-day average | 6.379 | ≤ 5.9 mg/L | 8% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 1.2 mg/L | all year |
| 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 | ≥ 6.3 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 | ≤ 30 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 851 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 1276 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, total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | 30-day average | report only (lb/d) | all year |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | 30-day average | report only (lb/d) | all year |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.9 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.6 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16.9 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.3 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.7 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.7 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.9 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.3 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.3 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17.6 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.5 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.1 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.9 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19.9 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.9 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.4 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.7 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.3 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.5 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.6 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.7 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.5 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 256.6 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 103.6 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 407.4 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 98.3 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 161.3 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 179.6 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 109 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 135.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 210.3 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 354.8 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 157.2 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 241.2 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 485.8 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 538.1 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 446.3 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 497.1 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 478 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 465.9 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 501.8 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 443.7 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 454.9 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 470.3 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 477.9 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 447.5 lb/d | Nov |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 252 lb/d | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 413 lb/d | all year |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (lb/d) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (lb/d) | all year |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | 30-day average | report only (lb/d) | all year |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year |
| E. coli | geometric mean | ≤ 126 #/100mL | Mar–Nov |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | ≤ 1 N=0;Y=1 | all year |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1 N=0;Y=1 | all year |
| 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 | ≤ 709 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 1134 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/IA0041921 · MCP: https://passage-data.com/mcp