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Sewage treatment plant, Coon Rapids, Iowa. NPDES permit IA0028983, in force until Jul 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | all year | 001 |
| E. coli | geometric mean | ≤ 126 #/100mL | Mar–Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | all year | 001 |
| pH | daily minimum | ≥ 6.3 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | all year | 002 |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | all year | 002 |
| E. coli | geometric mean | ≤ 126 #/100mL | Mar–Nov | 002 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | all year | 002 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 2.1 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 60 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 32.3 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 3 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 46.6 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 3.9 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 1.9 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 29.1 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 4.1 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 62.9 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 3 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 46.6 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 7.8 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 120.7 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 104.8 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 4.2 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 6.8 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 65.5 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 3.7 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 56.8 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 30.7 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 2 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 51.7 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 001 | 3.4 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 46.6 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 45.3 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 3 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 5.1 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 78.7 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 2.9 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 3 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 46.4 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 4.3 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 66.4 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 3 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 46.6 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 8.9 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 137.5 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 20.5 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 4.2 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 316.2 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 65.5 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 3.7 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 56.8 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 3.6 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 54.8 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 3.7 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 001 | 56.8 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 46.6 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 104.8 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 46.6 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 3 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 4.1 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 62.9 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 120.7 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 3 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 1.9 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 29.1 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 6.8 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 7.8 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 4.2 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 65.5 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 56.8 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 3.7 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 32.3 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 2.1 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 51.7 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 3.4 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 2 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 30.7 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 60 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average outfall 002 | 3.9 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 20.5 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 46.6 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 46.6 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 137.5 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 4.3 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 66.4 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 8.9 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 3 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 3 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 46.4 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 3 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 316.2 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 65.5 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 4.2 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 3.7 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 56.8 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 2.9 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 45.3 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 3.7 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 56.8 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 3.6 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 54.8 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 78.7 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum outfall 002 | 5.1 mg/L (Apr) | 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/IA0028983 · MCP: https://passage-data.com/mcp