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Sewage treatment plant, Swea City, Iowa. NPDES permit IA0047813, in force until Oct 31, 2028. Last 12 months: over a limit 3 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | BOD, carbonaceous [5 day, 20 C], 30-day average | 39 | ≤ 25 mg/L | 56% |
| November 2025 | BOD, carbonaceous [5 day, 20 C], 30-day average | 30 | ≤ 25 mg/L | 20% |
| May 2026 | BOD, carbonaceous [5 day, 20 C], 30-day average | 27 | ≤ 25 mg/L | 8% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | daily minimum | ≥ 6.5 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 | 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 | 389 mg/L | new | — | — |
| Chloride [as Cl], 30-day average | 2090 lb/d | new | — | — |
| Chloride [as Cl], daily maximum | 630 mg/L | new | — | — |
| Chloride [as Cl], daily maximum | 3312 lb/d | new | — | — |
| E. coli, geometric mean | 126 #/100mL (Mar–Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.7 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 9 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 14 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 13.4 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.7 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.3 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.6 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 17.4 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.1 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 20 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.9 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 16.2 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.1 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 14.3 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.7 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.8 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 19.9 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.8 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.4 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 23.2 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.2 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.2 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.6 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.1 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 14.1 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.9 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 17 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 25.3 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 14.1 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 20.5 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.8 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.3 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 104.8 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.3 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.2 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 17.4 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 17.4 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 19.9 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 20.6 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.9 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 44.4 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.5 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 14.1 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 14.1 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Aug) | new | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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