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Sewage treatment plant, Callender, Iowa. NPDES permit IA0057096, in force until Jul 31, 2028. Last 12 months: over a limit 5 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Chloride [as Cl], 30-day average | 622 | ≤ 389 mg/L | 60% |
| October 2025 | pH, daily maximum | 9.5 | ≤ 9 SU | — |
| November 2025 | Chloride [as Cl], 30-day average | 602 | ≤ 389 mg/L | 55% |
| May 2026 | Chloride [as Cl], 30-day average | 487 | ≤ 389 mg/L | 25% |
| June 2026 | Chloride [as Cl], 30-day average | 497 | ≤ 389 mg/L | 28% |
| 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 |
| Chloride [as Cl] | 30-day average | ≤ 389 mg/L | all year |
| Chloride [as Cl] | daily maximum | ≤ 629 mg/L | all year |
| Chloride [as Cl] | 30-day average | ≤ 4765 lb/d | all year |
| Chloride [as Cl] | daily maximum | ≤ 7710 lb/d | 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 |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], 30-day average | 12.9 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.5 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 19.9 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.8 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 16.7 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 31.7 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 43.6 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 22.2 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.6 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 43.5 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.4 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.6 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.6 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 50.5 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.1 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 12.2 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 29.7 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.4 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.6 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 19.5 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.1 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 13.5 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 39.4 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.2 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 32.6 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.9 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.9 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 39.4 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 47.8 lb/d (Mar) | 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 (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 39.4 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 47.7 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.2 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 19.9 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 244.1 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 103.3 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.4 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 32.7 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 32.6 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 57.9 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.7 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 32.6 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Sep) | new | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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