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Sewage treatment plant, Boyden, Iowa. NPDES permit IA0042838, in force until Mar 31, 2031. Last 12 months: over a limit 11 times (last July 2026), 2 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Oxygen, dissolved [DO], daily minimum | 4.5 | ≥ 5 mg/L | 10% |
| October 2025 | Solids, total suspended, 30-day average | 103.2 | ≤ 80 mg/L | 29% |
| January 2026 | Nitrogen, ammonia total [as N], 30-day average | 5.29625 | ≤ 5.2 mg/L | 2% |
| February 2026 | Chloride [as Cl], 30-day average | 1313.177 | ≤ 1134 lb/d | 16% |
| February 2026 | Chloride [as Cl], 30-day average | 408 | ≤ 389 mg/L | 5% |
| February 2026 | pH, daily maximum | 9.5 | ≤ 9 SU | — |
| April 2026 | pH, daily maximum | 9.8 | ≤ 9 SU | — |
| May 2026 | pH, daily maximum | 10.1 | ≤ 9 SU | — |
| July 2026 | Oxygen, dissolved [DO], daily minimum | 4.7 | ≥ 5 mg/L | 6% |
| July 2026 | Solids, total suspended, 30-day average | 242.4872 | ≤ 234 lb/d | 4% |
| July 2026 | pH, daily maximum | 9.1 | ≤ 9 SU | — |
| 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 | ≤ 234 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 350 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 | ≤ 5.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.8 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.9 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.5 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.9 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.3 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.1 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.7 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.2 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.7 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.9 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.9 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.7 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19.9 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.4 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.3 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.3 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.3 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.9 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.1 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.2 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.7 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.1 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.7 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24.5 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.3 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11.3 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.7 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11.3 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.3 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.8 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.3 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.7 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.7 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 58.1 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.7 lb/d | Oct |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (lb/d) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (lb/d) | all year |
| Chloride [as Cl] | 30-day average | ≤ 389 mg/L | all year |
| Chloride [as Cl] | daily maximum | ≤ 629 mg/L | all year |
| Chloride [as Cl] | 30-day average | ≤ 1134 lb/d | all year |
| Chloride [as Cl] | daily maximum | ≤ 1836 lb/d | all year |
| E. coli | geometric mean | ≤ 630 #/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 | ≤ 73 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 117 lb/d | all year |
| Parameter | New limit | From | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N], 30-day average | 9.9 lb/d (Mar) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.4 mg/L (Mar) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.4 lb/d (Apr) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.5 mg/L (Apr) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.8 lb/d (Jun) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.9 lb/d (Jul) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1 mg/L (Jul) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.6 mg/L (Oct) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.5 lb/d (Oct) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.1 mg/L (Sep) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.1 lb/d (Sep) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.8 lb/d (Aug) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.3 mg/L (Nov) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 6.8 lb/d (Nov) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.7 mg/L (May) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.1 lb/d (May) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.5 mg/L (Dec) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 7.2 lb/d (Dec) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 9.9 lb/d (Jan) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.4 mg/L (Jan) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 11.5 lb/d (Feb) | Jan 1, 2027 | tighter | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4 mg/L (Feb) | Jan 1, 2027 | tighter | — | — |
| Cyanide, total [as CN], 30-day average | 0.01518 lb/d | Mar 1, 2031 | new | — | — |
| Cyanide, total [as CN], 30-day average | 0.0052 mg/L | Mar 1, 2031 | new | — | — |
| Cyanide, total [as CN], daily maximum | 0.022 mg/L | Mar 1, 2031 | new | — | — |
| Cyanide, total [as CN], daily maximum | 0.06422 lb/d | Mar 1, 2031 | new | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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