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Sewage treatment plant, Massena, Iowa. NPDES permit IA0048348, in force until Feb 28, 2027. Last 12 months: over a limit 2 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| February 2026 | Oxygen, dissolved [DO], daily minimum | 4.96 | ≥ 5 mg/L | 1% |
| June 2026 | Oxygen, dissolved [DO], daily minimum | 3.8 | ≥ 5 mg/L | 24% |
| 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 | ≤ 30 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 45 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 68 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 | ≤ 1.3 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.3 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.5 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.6 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.5 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.4 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.7 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.5 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.9 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.3 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.6 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.1 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.3 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.5 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.7 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.4 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.1 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.6 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.6 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.6 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.6 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.6 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.6 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.4 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.4 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.4 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.4 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.4 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.6 lb/d | Sep |
| E. coli | geometric mean | ≤ 248 #/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 | ≤ 38 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 60 lb/d | all year |
Cited limits by parameter: Iowa's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/IA0048348 · MCP: https://passage-data.com/mcp