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Sewage treatment plant, Truro, Iowa. NPDES permit IA0040991, in force until Apr 30, 2029. Last 12 months: over a limit 4 times (last March 2026), 4 required values missing, 2 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | BOD, carbonaceous [5 day, 20 C], 30-day average | 52.5 | ≤ 25 mg/L | 110% |
| January 2026 | BOD, carbonaceous [5 day, 20 C], 7-day average | 105 | ≤ 40 mg/L | 163% |
| February 2026 | pH, daily maximum | 9.15 | ≤ 9 SU | — |
| March 2026 | pH, daily maximum | 9.13 | ≤ 9 SU | — |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 1 mg/L | all year |
| 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 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 | ≤ 80 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 121 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 182 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 | ≤ 13.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 25 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 41 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 20 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 41 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.3 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 23 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.2 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 14.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.2 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 33 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.6 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17.5 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.3 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.2 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.2 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 38 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.6 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.5 lb/d | Oct |
| 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 | ≤ 38 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 61 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 mg/L (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.8 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.9 lb/d (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.2 mg/L (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.6 mg/L (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.9 mg/L (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.3 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.6 lb/d (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.6 lb/d (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.8 mg/L (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.7 lb/d (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.7 lb/d (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3 mg/L (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.3 mg/L (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.3 mg/L (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5.6 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.3 lb/d (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5.3 mg/L (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.7 mg/L (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.8 mg/L (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.2 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.5 lb/d (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.5 mg/L (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.9 lb/d (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5.4 lb/d (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.4 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3 lb/d (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.4 mg/L (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.9 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5.6 mg/L (Jun) | tighter | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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