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Sewage treatment plant, Holy Cross, Iowa. NPDES permit IA0025992, in force until Jul 31, 2030. Last 12 months: no values over a limit, 4 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | 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 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Chloride [as Cl], 30-day average | 1890 lb/d | new | — | — |
| Chloride [as Cl], 30-day average | 405 mg/L | new | — | — |
| Chloride [as Cl], daily maximum | 631 mg/L | new | — | — |
| Chloride [as Cl], daily maximum | 2948 lb/d | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.1 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.4 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 20.7 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 9.2 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 4.4 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.1 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.7 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 12.7 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.2 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 10.2 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.1 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.2 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 14.6 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 1.1 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 5.6 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.9 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 13.5 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.8 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 17.8 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 2.5 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 11.7 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 17.8 lb/d (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], 30-day average | 3.8 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.3 mg/L (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 15.5 lb/d (Jul) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.9 mg/L (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 18.4 lb/d (Dec) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 12.7 lb/d (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Oct) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.4 mg/L (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 15.8 lb/d (Jun) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.7 mg/L (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 12.8 lb/d (Sep) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 8.5 mg/L (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 12.9 lb/d (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 39.7 lb/d (Feb) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 12.7 lb/d (Nov) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 2.8 mg/L (Aug) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.4 mg/L (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 15.7 lb/d (May) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 18.4 lb/d (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 3.9 mg/L (Mar) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 22.7 lb/d (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 4.9 mg/L (Apr) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 20 mg/L (Jan) | new | — | — |
| Nitrogen, ammonia total [as N], daily maximum | 93.6 lb/d (Jan) | new | — | — |
Cited limits by parameter: Iowa's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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