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Sewage treatment plant, Walthill, Nebraska. NPDES permit NE0138932 expired Dec 31, 2024; its limits still apply. Last 12 months: no values over a limit, 2 required values missing, 1 of 3 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | average | report only (deg F) | all year | 001 |
| Oxygen, dissolved [DO] | minimum | ≥ 5 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | weekly average | ≤ 120 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 80 mg/L | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.04 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.51 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.03 mg/L | Mar–May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.09 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.04 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.08 mg/L | Mar–May | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | per discharge | report only (MGD) | all year | 001 |
| E. coli, colony forming units [CFU] | maximum single sample | ≤ 298 CFU/100mL | May–Sep | 001 |
| E. coli, colony forming units [CFU] | geometric mean | ≤ 126 CFU/100mL | May–Sep | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Duration of discharge | event total | report only (d) | all year | 001 |
| Flow, total | event total | report only (Mgal/mo) | all year | 001 |
| pH | event total | report only (SU) | all year | 002 |
| Nitrogen, ammonia total [as N] | event total | report only (mg/L) | all year | 002 |
| Nitrogen, nitrate total [as N] | event total | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | event total | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | event total | report only (mg/L) | all year | 002 |
| Sodium adsorption ratio | event total | report only (Ratio) | all year | 002 |
| Chloride [as Cl] | event total | report only (mg/L) | all year | 002 |
| Application weekly spray irrigation | weekly maximum | ≤ 2 in | all year | 002 |
| Solids, total dissolved | event total | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | per discharge | report only (mg/L) | all year | 003 |
| pH | per discharge | report only (SU) | all year | 003 |
| Solids, total suspended | per discharge | report only (mg/L) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
Cited limits by parameter: Nebraska'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/NE0138932 · MCP: https://passage-data.com/mcp