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Sewage treatment plant, Richland, Iowa. NPDES permit IA0061328, in force until Jul 31, 2027. 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 | ≤ 80 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | Jan |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | Apr |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | Oct |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | Sep |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | Jun |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | Nov |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | Mar |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | Dec |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | Feb |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 36 mg/L | Jul |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 36 mg/L | Aug |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | May |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | Jan |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | Apr |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | Oct |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | Sep |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | Jun |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | Nov |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | Mar |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | Dec |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | Feb |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 36 mg/L | Jul |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 36 mg/L | Aug |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | May |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| E. coli, geometric mean | 634 #/100mL (Mar–Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 9.4 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.6 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.4 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 20.5 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 23.8 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 20.5 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.4 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 9.2 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.5 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.7 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 10.5 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.3 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 7.9 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.3 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 14 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.4 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.1 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.8 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.5 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 14.9 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.1 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 16 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 119.8 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 19.9 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.4 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 50.7 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 23.4 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.9 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.7 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 28.4 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.2 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 19.3 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 19.3 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.2 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 16 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 16 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 16 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 23.4 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.9 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.2 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 19.3 lb/d (Jul) | new | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/IA0061328 · MCP: https://passage-data.com/mcp