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City of South Sioux City

Sewage treatment plant, major discharger, South Sioux City, Nebraska. NPDES permit NE0139904, in force until Mar 31, 2028. Last 12 months: over a limit 51 times (last September 2026), 5 of 21 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form M quarterly (24 values), outfall 001 form Q quarterly (6 values), outfall INF form Q quarterly (5 values), outfall 001 form A yearly
Renewal application due
Oct 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
15 values over a limit, 0 required values missing, 4 of 21 reports late

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

All 51 values over a limit
Period endingParameterReportedLimitOver by
November 2025BOD, carbonaceous [5 day, 20 C], monthly average276.47 kg/d≤ 191 kg/d45%
November 2025BOD, carbonaceous [5 day, 20 C], monthly average30.43 mg/L≤ 25 mg/L22%
November 2025BOD, carbonaceous [5 day, 20 C], weekly average608.82 kg/d≤ 305.6 kg/d99%
November 2025BOD, carbonaceous [5 day, 20 C], weekly average67 mg/L≤ 40 mg/L68%
November 2025Solids, total suspended, monthly average1937.07 kg/d≤ 229.2 kg/d745%
November 2025Solids, total suspended, monthly average213.17 mg/L≤ 30 mg/L611%
November 2025Solids, total suspended, weekly average5134.08 kg/d≤ 343.8 kg/d1393%
November 2025Solids, total suspended, weekly average565 mg/L≤ 45 mg/L1156%
December 2025Solids, total suspended, monthly average1458.66 kg/d≤ 229.2 kg/d536%
December 2025Solids, total suspended, monthly average168.98 mg/L≤ 30 mg/L463%
December 2025Solids, total suspended, weekly average1927.11 kg/d≤ 343.8 kg/d461%
December 2025Solids, total suspended, weekly average223.25 mg/L≤ 45 mg/L396%
January 2026Solids, total suspended, monthly average272.7 kg/d≤ 229.2 kg/d19%
January 2026Solids, total suspended, monthly average32.06 mg/L≤ 30 mg/L7%
January 2026Solids, total suspended, weekly average504.64 kg/d≤ 343.8 kg/d47%
January 2026Solids, total suspended, weekly average59.33 mg/L≤ 45 mg/L32%
February 2026Solids, total suspended, monthly average259.41 kg/d≤ 229.2 kg/d13%
February 2026Solids, total suspended, monthly average30.96 mg/L≤ 30 mg/L3%
February 2026Solids, total suspended, weekly average475.57 kg/d≤ 343.8 kg/d38%
February 2026Solids, total suspended, weekly average56.75 mg/L≤ 45 mg/L26%
March 2026Solids, total suspended, monthly average397.28 kg/d≤ 229.2 kg/d73%
March 2026Solids, total suspended, monthly average52.43 mg/L≤ 30 mg/L75%
March 2026Solids, total suspended, weekly average124.25 mg/L≤ 45 mg/L176%
March 2026Solids, total suspended, weekly average941.42 kg/d≤ 343.8 kg/d174%
April 2026Solids, total suspended, monthly average642.59 kg/d≤ 229.2 kg/d180%
April 2026Solids, total suspended, monthly average73.2 mg/L≤ 30 mg/L144%
April 2026Solids, total suspended, weekly average1703.03 kg/d≤ 343.8 kg/d395%
April 2026Solids, total suspended, weekly average194 mg/L≤ 45 mg/L331%
May 2026E. coli, MTEC-MF, daily maximum1100 #/100L≤ 298 #/100L269%
May 2026E. coli, MTEC-MF, monthly geometric mean142 #/100L≤ 126 #/100L13%
May 2026Solids, total suspended, monthly average333.88 kg/d≤ 229.2 kg/d46%
May 2026Solids, total suspended, monthly average39.4 mg/L≤ 30 mg/L31%
May 2026Solids, total suspended, weekly average459.72 kg/d≤ 343.8 kg/d34%
May 2026Solids, total suspended, weekly average54.25 mg/L≤ 45 mg/L21%
June 2026Solids, total suspended, monthly average273.57 kg/d≤ 229.2 kg/d19%
June 2026Solids, total suspended, monthly average31.93 mg/L≤ 30 mg/L6%
July 2026Solids, total suspended, monthly average350.52 kg/d≤ 229.2 kg/d53%
July 2026Solids, total suspended, monthly average40.08 mg/L≤ 30 mg/L34%
July 2026Solids, total suspended, weekly average384.77 kg/d≤ 343.8 kg/d12%
August 2026E. coli, MTEC-MF, daily maximum430 #/100L≤ 298 #/100L44%
August 2026Solids, total suspended, monthly average325.32 kg/d≤ 229.2 kg/d42%
August 2026Solids, total suspended, monthly average38.91 mg/L≤ 30 mg/L30%
August 2026Solids, total suspended, weekly average418.05 kg/d≤ 343.8 kg/d22%
August 2026Solids, total suspended, weekly average50 mg/L≤ 45 mg/L11%
September 2026BOD, carbonaceous [5 day, 20 C], monthly average219.6 kg/d≤ 191 kg/d15%
September 2026BOD, carbonaceous [5 day, 20 C], monthly average27.22 mg/L≤ 25 mg/L9%
September 2026BOD, carbonaceous [5 day, 20 C], weekly average316.3 kg/d≤ 305.6 kg/d4%
September 2026Solids, total suspended, monthly average316.44 kg/d≤ 229.2 kg/d38%
September 2026Solids, total suspended, monthly average39.22 mg/L≤ 30 mg/L31%
September 2026Solids, total suspended, weekly average403.4 kg/d≤ 343.8 kg/d17%
September 2026Solids, total suspended, weekly average51.67 mg/L≤ 45 mg/L15%

Limits in force (57)

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 suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 229.2 kg/dall year001
Solids, total suspendedweekly average≤ 343.8 kg/dall year001
Oil and grease, hexane extr methodmonthly averagereport only (mg/L)all year001
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall 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 averagereport only (mg/L)Mar–May001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jun–Oct001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Mar–May001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jun–Oct001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly averagereport only (kg/d)Mar–May001
Nitrogen, ammonia total [as N]monthly averagereport only (kg/d)Jun–Oct001
Nitrogen, ammonia total [as N]monthly averagereport only (kg/d)Jan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximumreport only (kg/d)Mar–May001
Nitrogen, ammonia total [as N]daily maximumreport only (kg/d)Jun–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
Sulfate, total [as SO4]monthly averagereport only (mg/L)all year001
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year001
Arsenic, total [as As]monthly averagereport only (mg/L)all year001
Arsenic, total [as As]daily maximumreport only (mg/L)all year001
Cadmium, dissolved [as Cd]monthly averagereport only (mg/L)all year001
Cadmium, dissolved [as Cd]daily maximumreport only (mg/L)all year001
Chromium, dissolved [as Cr]monthly averagereport only (mg/L)all year001
Chromium, dissolved [as Cr]daily maximumreport only (mg/L)all year001
Copper, dissolved [as Cu]monthly averagereport only (mg/L)all year001
Copper, dissolved [as Cu]daily maximumreport only (mg/L)all year001
Lead, dissolved [as Pb]monthly averagereport only (mg/L)all year001
Lead, dissolved [as Pb]daily maximumreport only (mg/L)all year001
Nickel, dissolved [as Ni]monthly averagereport only (mg/L)all year001
Nickel, dissolved [as Ni]daily maximumreport only (mg/L)all year001
Zinc, dissolved [as Zn]monthly averagereport only (mg/L)all year001
Zinc, dissolved [as Zn]daily maximumreport only (mg/L)all year001
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100LMay–Sep001
E. coli, MTEC-MFdaily maximum≤ 298 #/100LMay–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
Toxicity [acute], Ceriodaphnia dubiavaluereport only (toxic)all year001
Toxicity [acute], Pimephales promelas [Fathead Minnow]valuereport only (toxic)all year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 191 kg/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 305.6 kg/dall year001
pHvaluereport only (SU)all yearINF
Solids, total suspendedvaluereport only (mg/L)all yearINF
Nitrogen, total [as N]valuereport 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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/NE0139904 · MCP: https://passage-data.com/mcp