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Sewage treatment plant, Sloan, Iowa. NPDES permit IA0073717 expired Jul 25, 2026; its limits still apply. Last 12 months: no values over a limit, 6 of 18 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | average | report only (deg F) | all year | 001A |
| Oxygen, dissolved [DO] | minimum | ≥ 5 mg/L | all year | 001A |
| pH | minimum | ≥ 6.5 SU | all year | 001A |
| pH | maximum | ≤ 9 SU | all year | 001A |
| Solids, total suspended | monthly average | ≤ 80 mg/L | all year | 001A |
| Solids, total suspended | weekly average | ≤ 120 mg/L | all year | 001A |
| Oil and grease, hexane extr method | monthly average | ≤ 10 mg/L | all year | 001A |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | 001A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.11 mg/L | Mar–Oct | 001A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.58 mg/L | Jan, Feb, Nov, Dec | 001A |
| Flow, in conduit or thru treatment plant | average | report only (MGD) | all year | 001A |
| E. coli | single sample | report only (CFU/100mL) | Jan, Feb, Nov, Dec | 001A |
| E. coli | maximum single sample | ≤ 235 CFU/100mL | Mar–Oct | 001A |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 001A |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | all year | 001A |
| BOD, carb-5 day, 20 deg C, percent removal | minimum | ≥ 85 % | all year | 001A |
| Duration of discharge | total | report only (d) | all year | 001A |
| Flow, total | event total | report only (Mgal/mo) | all year | 001A |
| pH | minimum | report only (SU) | all year | 002I |
| pH | maximum | report only (SU) | all year | 002I |
| Solids, total suspended | average | report only (mg/L) | all year | 002I |
| Oil and grease, hexane extr method | average | report only (mg/L) | all year | 002I |
| Flow, in conduit or thru treatment plant | average | report only (MGD) | all year | 002I |
| BOD, carbonaceous [5 day, 20 C] | average | report only (mg/L) | all year | 002I |
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/IA0073717 · MCP: https://passage-data.com/mcp