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Sewage treatment plant, Adair, Iowa. NPDES permit IA0035416, in force until Jul 31, 2029. Last 12 months: over a limit 4 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | BOD, carbonaceous [5 day, 20 C], 30-day average | 102.5019 | ≤ 69 lb/d | 49% |
| July 2026 | BOD, carbonaceous [5 day, 20 C], 30-day average | 125 | ≤ 25 mg/L | 400% |
| July 2026 | BOD, carbonaceous [5 day, 20 C], 7-day average | 178 | ≤ 40 mg/L | 345% |
| July 2026 | BOD, carbonaceous [5 day, 20 C], 7-day average | 181.1114 | ≤ 110 lb/d | 65% |
| 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 | ≤ 83 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 124 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 | ≤ 46 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 35 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.9 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 41 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 20 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 23 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 30 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.8 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 52 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 110 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 76 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 55 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 91 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 80 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 67 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 67 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 80 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 62 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 66 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 130 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 67 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 128 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 97 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 33 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 112 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 47 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 56 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 63 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 80 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 84 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 35 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 144 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 44 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 302 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 209 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 151 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 252 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 220 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 184 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 184 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 220 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 172 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 182 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 359 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 184 lb/d | Jun |
| 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 | ≤ 69 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 110 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 | 6.8 lb/d (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.5 mg/L (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.4 mg/L (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 9.4 lb/d (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 9.4 lb/d (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.4 mg/L (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.8 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.7 mg/L (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.4 lb/d (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.3 mg/L (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.3 lb/d (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.6 mg/L (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 10.9 lb/d (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4 mg/L (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1 mg/L (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.6 lb/d (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.5 mg/L (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.2 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.8 lb/d (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.3 mg/L (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.6 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.9 lb/d (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.1 mg/L (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 16 mg/L (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 43.9 lb/d (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 15.2 mg/L (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 41.8 lb/d (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 14.7 mg/L (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 40.4 lb/d (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 41.8 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 15.2 mg/L (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 40.4 lb/d (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 14.7 mg/L (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 43.2 lb/d (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 15.7 mg/L (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 39.1 lb/d (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 14.2 mg/L (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 44.7 lb/d (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 16.2 mg/L (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 43.2 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 15.7 mg/L (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 48.4 lb/d (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 17.6 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 39.7 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 14.4 mg/L (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 45.4 lb/d (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 16.5 mg/L (Sep) | tighter | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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