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Sewage treatment plant, Delta, Iowa. NPDES permit IA0070742, in force until Oct 31, 2029. Last 12 months: over a limit 6 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| February 2026 | Nitrogen, ammonia total [as N], 30-day average | 27.3 | ≤ 21.8 mg/L | 25% |
| February 2026 | Nitrogen, ammonia total [as N], daily maximum | 27.3 | ≤ 21.8 mg/L | 25% |
| March 2026 | Nitrogen, ammonia total [as N], 30-day average | 28.5 | ≤ 10.1 mg/L | 182% |
| March 2026 | Nitrogen, ammonia total [as N], daily maximum | 28.5 | ≤ 10.1 mg/L | 182% |
| April 2026 | Nitrogen, ammonia total [as N], 30-day average | 15.1 | ≤ 12.2 mg/L | 24% |
| April 2026 | Nitrogen, ammonia total [as N], daily maximum | 15.1 | ≤ 12.2 mg/L | 24% |
| 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 |
| 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 | ≤ 42 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 63.1 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 | ≤ 6.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.2 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 28.2 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.3 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.1 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.3 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.9 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.9 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.9 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.2 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28.2 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.3 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.3 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.6 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.2 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.5 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.4 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.4 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.3 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.4 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.6 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.6 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.6 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.3 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.6 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.2 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.5 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11.4 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.4 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.3 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.4 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.6 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.6 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.6 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.3 lb/d | Mar |
| E. coli | geometric mean | ≤ 5323 #/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 | ≤ 13.1 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 21 lb/d | all year |
Cited limits by parameter: Iowa's rules and the federal ones.
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