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Sewage treatment plant, major discharger, Clarion, Iowa. NPDES permit IA0030945, in force until Jan 31, 2028. Last 12 months: over a limit once (last July 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | Oxygen, dissolved [DO], daily minimum | 3.5 | ≥ 5 mg/L | 30% |
| 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 | ≤ 303 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 454 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 | ≤ 1.9 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.7 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.5 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.4 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.3 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.7 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.7 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.3 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.7 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.9 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.7 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.9 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.5 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.7 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 36.2 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 24.7 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.9 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.1 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16.5 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.2 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 42 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 26.3 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16.2 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 36.1 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 32.5 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.9 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 77.7 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.9 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 32.5 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.9 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.9 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.9 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 85.1 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 39.3 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 47.7 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 39.4 lb/d | Mar |
| Nitrogen, nitrate total [as N] | 30-day average | ≤ 169.1 lb/d | all year |
| Nitrogen, nitrate total [as N] | daily maximum | ≤ 276.79 lb/d | all year |
| 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 |
| E. coli | geometric mean | ≤ 630 #/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 | ≤ 252 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 404 lb/d | all year |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Thallium, total [as Tl], 30-day average | 0.007961 lb/d | new | — | — |
| Thallium, total [as Tl], 30-day average | 0.001032 mg/L | new | — | — |
| Thallium, total [as Tl], daily maximum | 0.5994 mg/L | new | — | — |
| Thallium, total [as Tl], daily maximum | 6.043 lb/d | new | — | — |
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/IA0030945 · MCP: https://passage-data.com/mcp