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Sid #128, Douglas County, Twilight Hills WWTF

Sewage treatment plant, Omaha, Nebraska. NPDES permit NE0113077, in force until Mar 31, 2027. Last 12 months: over a limit 8 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form M quarterly (4 values), outfall 001 form Q quarterly (22 values), outfall INF form A yearly
Renewal application due
Oct 2, 2026 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
8 values over a limit, 0 required values missing, 2 of 17 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
March 2026BOD, carbonaceous [5 day, 20 C], 7-day average96.9 mg/L≤ 40 mg/L142%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average96.9 mg/L≤ 25 mg/L288%
March 2026Solids, total suspended, 7-day average48 mg/L≤ 45 mg/L7%
March 2026Solids, total suspended, monthly average48 mg/L≤ 30 mg/L60%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average37.7 mg/L≤ 25 mg/L51%
June 2026E. coli, MTEC-MF, maximum816.4 #/100mL≤ 298 #/100mL174%
June 2026E. coli, MTEC-MF, monthly geometric mean816.4 #/100mL≤ 126 #/100mL548%
September 2026BOD, carbonaceous [5 day, 20 C], monthly average29.7 mg/L≤ 25 mg/L19%

Limits in force (38)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year001
pHdaily minimum≥ 6.5 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspended7-day average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 5.67 kg/dall year001
Solids, total suspended7-day average≤ 8.51 kg/dall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 25.57 mg/LMar–May001
Nitrogen, ammonia total [as N]monthly average≤ 19.88 mg/LJun–Oct001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 51.3 mg/LMar–May001
Nitrogen, ammonia total [as N]daily maximum≤ 39.88 mg/LJun–Oct001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ .44 kg/dMar–May001
Nitrogen, ammonia total [as N]monthly average≤ .34 kg/dJun–Oct001
Nitrogen, ammonia total [as N]monthly averagereport only (kg/d)Jan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ .87 kg/dMar–May001
Nitrogen, ammonia total [as N]daily maximum≤ .68 kg/dJun–Oct001
Nitrogen, ammonia total [as N]daily maximumreport only (kg/d)Jan, Feb, Nov, Dec001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLMay–Sep001
E. coli, MTEC-MFmaximum≤ 298 #/100mLMay–Sep001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualmonthly average≤ .05 mL/Lall year001
Chlorine, total residualdaily maximum≤ .1 mL/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 4.73 kg/dall year001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 7.57 kg/dall year001
pHvaluereport only (SU)all yearINF
Solids, total suspendedvaluereport only (mg/L)all yearINF
Flow, in conduit or thru treatment plantvaluereport only (MGD)all yearINF
BOD, carbonaceous [5 day, 20 C]valuereport only (mg/L)all yearINF

How strict are these limits?

Cited limits by parameter: Nebraska's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/NE0113077 · MCP: https://passage-data.com/mcp