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Sewage treatment plant, Gowrie, Iowa. NPDES permit IA0020966, in force until Nov 30, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 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 | ≥ 6.5 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 | ≤ 80 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 480 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 721 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 | ≤ 18.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.9 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 25.6 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.6 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16.4 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 41.1 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 35.2 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 30 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.4 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.9 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25.6 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.9 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.1 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 41.1 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 35.2 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 114 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 131 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 66 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 79 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 154 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 80 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 112 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 99 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 247 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 211 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 180 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 75 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 114 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 131 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 66 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 79 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 154 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 80 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 131 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 120 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 247 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 211 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 180 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 93 lb/d | Jun |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 53 lb/d | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 87 lb/d | all year |
| Chloride [as Cl] | 30-day average | ≤ 452 mg/L | all year |
| Chloride [as Cl] | daily maximum | ≤ 640 mg/L | all year |
| Chloride [as Cl] | 30-day average | ≤ 2382 lb/d | all year |
| Chloride [as Cl] | daily maximum | ≤ 3784 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 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 150 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 240 lb/d | all year |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| E. coli, geometric mean | 630 #/100mL (Mar–Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 15.2 lb/d (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.8 mg/L (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 11.4 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.6 mg/L (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 25.8 lb/d (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3 mg/L (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.8 mg/L (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.2 lb/d (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 22.3 lb/d (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.7 mg/L (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.1 mg/L (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 22.2 lb/d (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.6 lb/d (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.7 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.2 mg/L (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 8.6 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.1 mg/L (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 16.2 lb/d (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.9 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 | 2.7 mg/L (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 10.2 lb/d (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 10 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.6 mg/L (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.8 mg/L (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 16 lb/d (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 16.1 lb/d (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 50.7 lb/d (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.7 mg/L (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 119.7 lb/d (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 20.3 mg/L (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.9 mg/L (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 19.4 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.4 mg/L (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.1 mg/L (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 23.5 lb/d (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.4 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 19.4 lb/d (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 19.4 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.4 mg/L (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 23.4 lb/d (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.1 mg/L (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.8 mg/L (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 16 lb/d (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 16 lb/d (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.8 mg/L (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.9 mg/L (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 28.4 lb/d (Apr) | tighter | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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