Passage Data · Check a report · Use it from your AI
Sewage treatment plant, major discharger, Coralville, Iowa. NPDES permit IA0020788, in force until Sep 30, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | daily minimum | ≥ 6.4 SU | all year |
| pH | daily maximum | ≤ 9 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 | ≤ 1440 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 2159 lb/d | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.8 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.1 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.6 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.9 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.3 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.1 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.5 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.2 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16.1 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19.4 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.3 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.6 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.4 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.2 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.5 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.9 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19.4 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.4 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.7 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 229.5 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 441.7 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 508.1 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 747.4 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 330.9 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 378.1 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 339.6 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 218.1 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 207 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 285.2 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 540.5 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 799.7 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 882.5 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 808.6 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 787.7 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 835.7 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 840.6 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 823.4 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 840.8 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 949.4 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 877.7 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 784.8 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 854.4 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 799.7 lb/d | Feb |
| 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 | ≤ 1200 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 1920 lb/d | all year |
Cited limits by parameter: Iowa's rules and the federal ones.
· Save this facility as a site · Superfund sites nearby · Your permits on one board
On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/IA0020788 · MCP: https://passage-data.com/mcp