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Sewage treatment plant, Lidderdale, Iowa. NPDES permit IA0056855, in force until Apr 30, 2028. Last 12 months: no values over a limit, 1 of 11 reports late. 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 | all year |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.9 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.1 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.4 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.2 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.3 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.2 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.8 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.9 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.6 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.4 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.4 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.9 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.2 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.4 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.9 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.4 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.1 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.1 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.8 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.8 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.6 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.2 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.3 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.1 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.3 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19.4 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.8 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.3 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.7 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.5 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 45.5 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.6 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.2 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.1 lb/d | Mar |
| Chloride [as Cl] | 30-day average | ≤ 508 mg/L | all year |
| Chloride [as Cl] | daily maximum | ≤ 731 mg/L | all year |
| Chloride [as Cl] | 30-day average | ≤ 1145 lb/d | all year |
| Chloride [as Cl] | daily maximum | ≤ 1646 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 |
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/IA0056855 · MCP: https://passage-data.com/mcp