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Sewage treatment plant, Casey, Iowa. NPDES permit IA0027197, in force until Aug 31, 2029. Last 12 months: over a limit 6 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | BOD, carbonaceous [5 day, 20 C], 7-day average | 30.54538 | ≤ 25 lb/d | 22% |
| January 2026 | Solids, total suspended, 30-day average | 270.2839 | ≤ 19 lb/d | 1323% |
| January 2026 | Solids, total suspended, 30-day average | 337.325 | ≤ 30 mg/L | 1024% |
| January 2026 | Solids, total suspended, 7-day average | 1069.088 | ≤ 28 lb/d | 3718% |
| January 2026 | Solids, total suspended, 7-day average | 1330 | ≤ 45 mg/L | 2856% |
| July 2026 | Solids, total suspended, 30-day average | 40.28 | ≤ 30 mg/L | 34% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | 30-day average | report only (lb/d) | all year |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | all year |
| pH | daily minimum | ≥ 6.5 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| pH | 30-day average | report only (SU) | all year |
| pH | daily maximum | report only (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 | ≤ 19 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 28 lb/d | all year |
| Solids, total suspended | 30-day average | report only (mg/L) | all year |
| Solids, total suspended | daily maximum | report only (mg/L) | all year |
| Solids, total suspended | 30-day average | report only (lb/d) | all year |
| Solids, total suspended | daily maximum | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.4 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.3 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.4 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.3 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.3 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.3 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.3 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.3 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.3 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.3 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12 lb/d | Mar |
| 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 | ≤ 16 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 25 lb/d | all year |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| E. coli, geometric mean | 126 #/100mL (Mar–Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.3 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.6 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.5 lb/d (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.4 lb/d (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.5 lb/d (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.3 lb/d (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.7 lb/d (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.6 lb/d (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.1 lb/d (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 9.8 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 9.5 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 11 lb/d (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 10.1 lb/d (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 9.2 lb/d (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 9.8 lb/d (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 10 lb/d (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 10.3 lb/d (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 9 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 9.2 lb/d (Mar) | tighter | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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