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Sewage treatment plant, Montour, Iowa. NPDES permit IA0058700, in force until Jan 31, 2031. Last 12 months: over a limit 3 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | Nitrogen, ammonia total [as N], 30-day average | 2.01 | ≤ 2 mg/L | 1% |
| September 2026 | Nitrogen, ammonia total [as N], 30-day average | 3.49 | ≤ 2.3 mg/L | 52% |
| September 2026 | Nitrogen, ammonia total [as N], daily maximum | 3.49 | ≤ 2.8 mg/L | 25% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 4.6 mg/L | all year |
| 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 |
| Solids, total suspended | 30-day average | ≤ 55 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 83 lb/d | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.4 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.8 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.7 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.8 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.8 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.3 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.3 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.8 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.1 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.7 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.3 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.9 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.6 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.7 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.2 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.9 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.9 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.8 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.3 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.3 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.3 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.9 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.9 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.9 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.3 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.9 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.9 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.3 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.9 lb/d | Sep |
| Chlorine, total residual | 30-day average | ≤ .053 mg/L | all year |
| Chlorine, total residual | daily maximum | ≤ .053 mg/L | all year |
| Chlorine, total residual | 30-day average | ≤ .04 lb/d | all year |
| Chlorine, total residual | daily maximum | ≤ .04 lb/d | all year |
| E. coli | geometric mean | ≤ 217 #/100mL | Mar–Nov |
| 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 | ≤ 17 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 28 lb/d | all year |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Chlorine, total residual, 30-day average | 0.011 mg/L | tighter | 0.003333 mg/L (7 values) | 0.303× |
| Chlorine, total residual, 30-day average | 0.008 lb/d | tighter | 0.001056 lb/d (7 values) | 0.132× |
| Chlorine, total residual, daily maximum | 0.019 mg/L | tighter | 0.01 mg/L (7 values) | 0.526× |
| Chlorine, total residual, daily maximum | 0.013 lb/d | tighter | 0.003169 lb/d (7 values) | 0.244× |
| E. coli, geometric mean | 126 #/100mL (Mar–Nov) | tighter | 107.4 #/100mL (3 values) | 0.852× |
| Nitrogen, ammonia total [as N], 30-day average | 1.6 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 | 2.4 lb/d (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.4 mg/L (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 0.7 lb/d (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.7 mg/L (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 0.7 lb/d (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1 mg/L (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.5 mg/L (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.2 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.7 lb/d (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.1 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4 mg/L (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 0.7 lb/d (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.1 mg/L (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.4 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 | 1.1 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 | 1.7 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 | 0.9 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.3 mg/L (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 1.8 lb/d (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 19.9 mg/L (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 13.8 lb/d (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 1.8 lb/d (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.7 mg/L (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.2 lb/d (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5.8 lb/d (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.2 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.2 mg/L (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.2 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 1.8 lb/d (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.4 mg/L (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 lb/d (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.9 mg/L (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 1.8 lb/d (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.9 mg/L (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.2 mg/L (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.2 lb/d (Jun) | tighter | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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