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Sewage treatment plant, major discharger, Centerville, Iowa. NPDES permit IA0027472, in force until May 31, 2029. Last 12 months: over a limit 6 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Oxygen, dissolved [DO], daily minimum | 4.2 | ≥ 5 mg/L | 16% |
| December 2025 | BOD, carbonaceous [5 day, 20 C], 7-day average | 69.5 | ≤ 40 mg/L | 74% |
| February 2026 | Oxygen, dissolved [DO], daily minimum | 4.7 | ≥ 5 mg/L | 6% |
| May 2026 | Oxygen, dissolved [DO], daily minimum | 4.7 | ≥ 5 mg/L | 6% |
| July 2026 | Oxygen, dissolved [DO], daily minimum | 3.9 | ≥ 5 mg/L | 22% |
| July 2026 | pH, daily maximum | 11.9 | ≤ 9 SU | — |
| 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 | ≤ 375 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 563 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, ammonia total [as N] | 30-day average | ≤ 1.6 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.3 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.5 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.5 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.4 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.3 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.1 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.1 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.1 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.1 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.1 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.7 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.8 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.1 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.8 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.7 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.1 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 19.5 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 33 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.2 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 19.1 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 31 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 42.6 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.9 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.6 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 49.4 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.7 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 59 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 59 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 59 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 59 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 59 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 59 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 126 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 56 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 59 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 56 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 126 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 59 lb/d | May |
| 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 |
| E. coli | geometric mean | ≤ 236 #/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 | ≤ 313 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 500 lb/d | all year |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Cyanide, total [as CN], 30-day average | 0.0052 mg/L | new | — | — |
| Cyanide, total [as CN], 30-day average | 0.06505 lb/d | new | — | — |
| Cyanide, total [as CN], daily maximum | 0.2752 lb/d | new | — | — |
| Cyanide, total [as CN], daily maximum | 0.022 mg/L | new | — | — |
| Mercury, total [as Hg], 30-day average | 0.0005463 mg/L | new | — | — |
| Mercury, total [as Hg], 30-day average | 0.005677 lb/d | new | — | — |
| Mercury, total [as Hg], daily maximum | 0.0206 lb/d | new | — | — |
| Mercury, total [as Hg], daily maximum | 0.001647 mg/L | new | — | — |
| Phenols, 30-day average | 0.05 mg/L | new | — | — |
| Phenols, 30-day average | 0.6255 lb/d | new | — | — |
| Phenols, daily maximum | 2.5 mg/L | new | — | — |
| Phenols, daily maximum | 31.28 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/IA0027472 · MCP: https://passage-data.com/mcp