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Sewage treatment plant, Beacon, Iowa. NPDES permit IA0035424, in force until Aug 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 4.2 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 | ≤ 126.1 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 189.2 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 | ≤ 19 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 14 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 32 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 74 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 14 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 48 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 23 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 57 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 41 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 65 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 31 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 53 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 115 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 72 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 37 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 85 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 61 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 105 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 30 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 22 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 24 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 50 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 19 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 117 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 22 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 76 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 36 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 89 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 64 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 103 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 49 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 36 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 39 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 83 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 32 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 181 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 36 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 113 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 59 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 134 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 96 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 166 lb/d | Jan |
| 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 | ≤ 39.4 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 63.1 lb/d | all year |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| E. coli, geometric mean | 634 #/100mL (Mar–Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.1 lb/d (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.2 lb/d (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.1 mg/L (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.3 lb/d (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.7 mg/L (Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.1 lb/d (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.9 mg/L (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3 mg/L (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.2 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.9 mg/L (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.2 lb/d (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 7.8 mg/L (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 8.3 lb/d (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.9 mg/L (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2 lb/d (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.2 lb/d (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.7 mg/L (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 7.2 lb/d (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.8 mg/L (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.7 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.2 mg/L (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.6 mg/L (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.8 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5.1 lb/d (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.2 mg/L (Jul) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.2 lb/d (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Sep) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.2 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 (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.1 lb/d (Mar) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 7.4 lb/d (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.7 mg/L (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.9 mg/L (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 6.1 lb/d (Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 13.3 lb/d (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.4 mg/L (Feb) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.2 lb/d (Aug) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.2 lb/d (Nov) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 31.4 lb/d (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 19.9 mg/L (Jan) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5.1 lb/d (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.2 mg/L (May) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 5.1 lb/d (Jun) | tighter | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.2 mg/L (Jun) | tighter | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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