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Sewage treatment plant, major discharger, Aurora, Nebraska. NPDES permit NE0031810, in force until Mar 31, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 001 |
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 170.3 kg/d | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 272.5 kg/d | all year | 001 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.95 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.55 mg/L | Mar–May | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .86 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.91 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.11 mg/L | Mar–May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.73 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 9.52 kg/d | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.97 kg/d | Mar–May | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.91 kg/d | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19.11 kg/d | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.97 kg/d | Mar–May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.83 kg/d | Jun–Oct | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Arsenic, dissolved [as As] | monthly average | report only (mg/L) | all year | 001 |
| Arsenic, dissolved [as As] | daily maximum | report only (mg/L) | all year | 001 |
| Beryllium, dissolved [as Be] | monthly average | report only (mg/L) | all year | 001 |
| Beryllium, dissolved [as Be] | daily maximum | report only (mg/L) | all year | 001 |
| Cadmium, dissolved [as Cd] | monthly average | report only (mg/L) | all year | 001 |
| Cadmium, dissolved [as Cd] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, dissolved [as Cr] | monthly average | report only (mg/L) | all year | 001 |
| Chromium, dissolved [as Cr] | daily maximum | report only (mg/L) | all year | 001 |
| Copper, dissolved [as Cu] | monthly average | report only (mg/L) | all year | 001 |
| Copper, dissolved [as Cu] | daily maximum | report only (mg/L) | all year | 001 |
| Lead, dissolved [as Pb] | monthly average | report only (mg/L) | all year | 001 |
| Lead, dissolved [as Pb] | daily maximum | report only (mg/L) | all year | 001 |
| Nickel, dissolved [as Ni] | monthly average | report only (mg/L) | all year | 001 |
| Nickel, dissolved [as Ni] | daily maximum | report only (mg/L) | all year | 001 |
| Silver, dissolved [as Ag] | monthly average | report only (mg/L) | all year | 001 |
| Silver, dissolved [as Ag] | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, dissolved [as Zn] | monthly average | report only (mg/L) | all year | 001 |
| Zinc, dissolved [as Zn] | daily maximum | report only (mg/L) | all year | 001 |
| Selenium, dissolved [as Se] | monthly average | report only (mg/L) | all year | 001 |
| Selenium, dissolved [as Se] | daily maximum | report only (mg/L) | all year | 001 |
| E. coli, MTEC-MF | monthly geometric mean | report only (#/100mL) | May–Sep | 001 |
| E. coli, MTEC-MF | daily maximum | report only (#/100mL) | May–Sep | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Toxicity [acute], Ceriodaphnia dubia | monthly average | report only (tox acute) | all year | 001 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | ≤ 1 tox acute | all year | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | monthly average | report only (tox acute) | all year | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1 tox acute | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 204.4 kg/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 306.6 kg/d | all year | 001 |
| pH | value | report only (SU) | all year | INF |
| Solids, total suspended | value | report only (mg/L) | all year | INF |
| Beryllium, dissolved [as Be] | value | report only (mg/L) | all year | INF |
| Copper, dissolved [as Cu] | value | report only (mg/L) | all year | INF |
| Zinc, dissolved [as Zn] | value | report only (mg/L) | all year | INF |
| Flow, in conduit or thru treatment plant | value | report only (MGD) | all year | INF |
| BOD, carbonaceous [5 day, 20 C] | value | report only (mg/L) | all year | INF |
Cited limits by parameter: Nebraska's rules and the federal ones.
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