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Sewage treatment plant, Fairfield, Iowa. NPDES permit IA0072699 expired Jul 22, 2003; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| 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 | ≤ 5 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 7.5 lb/d | all year |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .02 MGD | all year |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ .08 MGD | 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 | ≤ 4 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 7 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/IA0072699 · MCP: https://passage-data.com/mcp