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Sewage treatment plant, major discharger, Dubuque, Iowa. NPDES permit IA0044458, in force until Mar 31, 2030. Last 12 months: over a limit 16 times (last August 2026), 2 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | BOD, carbonaceous [5 day, 20 C], 30-day average | 41.8387 | ≤ 25 mg/L | 67% |
| October 2025 | BOD, carbonaceous [5 day, 20 C], 7-day average | 62.14285 | ≤ 40 mg/L | 55% |
| November 2025 | E. coli, geometric mean | 500.4226 | ≤ 126 #/100mL | 297% |
| February 2026 | BOD, carbonaceous [5 day, 20 C], 30-day average | 44.35714 | ≤ 25 mg/L | 77% |
| February 2026 | BOD, carbonaceous [5 day, 20 C], 7-day average | 52.85714 | ≤ 40 mg/L | 32% |
| March 2026 | BOD, carbonaceous [5 day, 20 C], 30-day average | 41.96774 | ≤ 25 mg/L | 68% |
| March 2026 | BOD, carbonaceous [5 day, 20 C], 7-day average | 65.57142 | ≤ 40 mg/L | 64% |
| May 2026 | E. coli, geometric mean | 35309.87 | ≤ 126 #/100mL | 27924% |
| July 2026 | Nitrogen, ammonia total [as N], daily maximum | 3690.45 | ≤ 3595 lb/d | 3% |
| July 2026 | Nitrogen, ammonia total [as N], daily maximum | 60.7 | ≤ 52 mg/L | 17% |
| August 2026 | BOD, carbonaceous [5 day, 20 C], 30-day average | 39.77272 | ≤ 25 mg/L | 59% |
| August 2026 | BOD, carbonaceous [5 day, 20 C], 7-day average | 60 | ≤ 40 mg/L | 50% |
| August 2026 | E. coli, geometric mean | 62376.23 | ≤ 126 #/100mL | 49405% |
| August 2026 | Nitrogen, ammonia total [as N], daily maximum | 66.8 | ≤ 65 mg/L | 3% |
| August 2026 | Solids, total suspended, 30-day average | 42.45454 | ≤ 30 mg/L | 42% |
| August 2026 | Solids, total suspended, 7-day average | 53.4 | ≤ 45 mg/L | 19% |
| 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 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 | ≤ 3370 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 5055 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, total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | 30-day average | report only (lb/d) | all year |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 89.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 52 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 117.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 87.8 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 88.8 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 102 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 65 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 87.9 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 139.2 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 86.5 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 117.9 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 100.3 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 89.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 52 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 117.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 87.8 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 88.8 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 102 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 87.9 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 139.2 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 86.5 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 117.9 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 100.3 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7492.7 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3595 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9499.2 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7345 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7434.8 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8382.7 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4494 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7353 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11144.6 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7187.9 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9581.2 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8219.2 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7492.7 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3595 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9499.2 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7345 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7434.8 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8382.7 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4494 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7353 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11144.6 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7187.9 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9581.2 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8219.2 lb/d | Jun |
| 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 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | 30-day average | report only (lb/d) | all year |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year |
| E. coli | geometric mean | ≤ 126 #/100mL | Mar–Nov |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | ≤ 1 N=0;Y=1 | all year |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1 N=0;Y=1 | 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 | ≤ 2808 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 4494 lb/d | all year |
Cited limits by parameter: Iowa's rules and the federal ones.
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