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Sewage treatment plant, major discharger, Maquoketa, Iowa. NPDES permit IA0024481 expired May 31, 2025; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| 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 | ≤ 325 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 488 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, 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 | ≤ 34.5 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 41 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 37 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 33.1 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 38.5 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 40 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 40.4 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 35.6 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 36 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 34.8 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 44.4 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 34.5 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 34.5 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 41 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 37 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 33.1 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 38.5 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 40 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 40.4 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 35.6 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 36 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 34.8 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 44.4 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 34.5 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 334.6 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 388.4 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 354.5 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 319.9 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 370 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 378.4 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 390.7 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 347 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 344.2 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 338.6 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 414.3 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 334.9 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 334.6 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 388.4 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 354.5 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 319.9 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 370 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 378.4 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 390.7 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 347 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 344.2 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 338.6 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 414.3 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 334.9 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 |
| 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 |
| 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 |
| Chlorine, total residual | 30-day average | ≤ .087 mg/L | all year |
| Chlorine, total residual | daily maximum | ≤ .087 mg/L | all year |
| Chlorine, total residual | 30-day average | ≤ .79 lb/d | all year |
| Chlorine, total residual | daily maximum | ≤ .79 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 | ≤ 271 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 434 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/IA0024481 · MCP: https://passage-data.com/mcp