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Sewage treatment plant, Atkinson, Nebraska. NPDES permit NE0021610, in force until Sep 30, 2030. Last 12 months: over a limit 4 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | Nitrogen, ammonia total [as N], daily maximum | 4.1 kg/d | ≤ 2.09 kg/d | 96% |
| July 2026 | Nitrogen, ammonia total [as N], daily maximum | 9.56 mg/L | ≤ 3.23 mg/L | 196% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 4.1 kg/d | ≤ 1.01 kg/d | 306% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 9.56 mg/L | ≤ 1.56 mg/L | 513% |
| 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 |
| Oxygen, dissolved [DO] | value | report only (mg/L) | 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 | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 16.9 kg/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 25.4 kg/d | all year | 001 |
| Oil and grease, hexane extr method | value | report only (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 | ≤ 11.9 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 30 mg/L | Mar–May | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.56 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22.4 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 62.8 mg/L | Mar–May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.23 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 7.88 kg/d | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 18.4 kg/d | Mar–May | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.01 kg/d | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.8 kg/d | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 38.5 kg/d | Mar–May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.09 kg/d | Jun–Oct | 001 |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | value | report only (mg/L) | all year | 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 |
| 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 |
| 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 |
| E. coli, MTEC-MF | monthly geometric mean | ≤ 126 #/100mL | May–Sep | 001 |
| E. coli, MTEC-MF | daily maximum | ≤ 298 #/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 |
| Solids, total dissolved | value | report only (mg/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 14.1 kg/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 22.6 kg/d | all year | 001 |
| pH | value | report only (SU) | all year | INF |
| Solids, total suspended | value | report only (mg/L) | all year | INF |
| 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 |
| pH | value | report only (SU) | all year | SLG |
| Nitrate nitrogen, dry weight | value | report only (mg/kg) | all year | SLG |
| Selenium, sludge, total, dry weight [as Se] | value | report only (mg/kg) | all year | SLG |
| Arsenic total, dry weight, sludge | value | report only (mg/kg) | all year | SLG |
| Molybdenum, sludge, total, dry weight [as Mo] | value | report only (mg/kg) | all year | SLG |
| Zinc, sludge, total, dry weight [as Zn] | value | report only (mg/kg) | all year | SLG |
| Lead, sludge, total, dry weight [as Pb] | value | report only (mg/kg) | all year | SLG |
| Nickel, sludge, total, dry weight [as Ni] | value | report only (mg/kg) | all year | SLG |
| Nitrogen, sludge, total, dry weight [as N] | value | report only (mg/kg) | all year | SLG |
| Mercury, sludge, total, dry weight [as Hg] | value | report only (mg/kg) | all year | SLG |
| Chromium, sludge, total, dry weight [as Cr] | value | report only (mg/kg) | all year | SLG |
| Copper, sludge, total, dry weight [as Cu] | value | report only (mg/kg) | all year | SLG |
| Cadmium, sludge, total, dry weight [as Cd] | value | report only (mg/kg) | all year | SLG |
| Solids, sludge, total, dry weight | value | report only (kg) | all year | SLG |
| Nitrogen, ammonia, sludge, tot dry wgt | value | report only (mg/kg) | all year | SLG |
Cited limits by parameter: Nebraska's rules and the federal ones.
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