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Sewage treatment plant, Inwood, Iowa. NPDES permit IA0031232, in force until Aug 31, 2029. 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 | 9.1 | ≤ 9 SU |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | daily minimum | ≥ 6 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 | ≤ 3.5 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.4 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.5 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.5 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.6 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.6 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.4 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.8 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.1 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.2 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.4 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.9 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.4 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.4 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.6 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 71.5 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 48.8 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.2 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 20.2 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 71.5 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 52 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 32.7 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 32.1 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 27.6 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 36.6 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 22.3 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 83 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 249.3 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 56.9 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 69.1 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 57.8 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 83.3 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 82 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 57 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 99.2 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 69 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 68.9 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 57.1 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 176.6 lb/d | Feb |
| 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 |
|---|---|---|---|---|
| Chloride [as Cl], 30-day average | 8133 lb/d | new | — | — |
| Chloride [as Cl], 30-day average | 398 mg/L | new | — | — |
| Chloride [as Cl], daily maximum | 645 mg/L | new | — | — |
| Chloride [as Cl], daily maximum | 13170 lb/d | new | — | — |
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/IA0031232 · MCP: https://passage-data.com/mcp