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Osage City, City of

Sewage treatment plant, Osage City, Kansas. NPDES permit KS0022675, in force until Sep 30, 2029. Last 12 months: over a limit 6 times (last August 2026), 3 required values missing, 4 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (11 values), outfall 002 form A monthly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
8 values over a limit, 5 required values missing, 3 of 24 reports late

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

Period endingParameterReportedLimitOver by
November 2025BOD, 5-day, 20 deg. C, monthly average36.5 mg/L≤ 30 mg/L22%
December 2025BOD, 5-day, 20 deg. C, monthly average30.7 mg/L≤ 30 mg/L2%
March 2026BOD, 5-day, 20 deg. C, monthly average32.1 mg/L≤ 30 mg/L7%
May 2026BOD, 5-day, 20 deg. C, monthly average33.5 mg/L≤ 30 mg/L12%
July 2026BOD, 5-day, 20 deg. C, monthly average37 mg/L≤ 30 mg/L23%
August 2026Solids, total suspended, monthly average83.2 mg/L≤ 80 mg/L4%

Limits in force (26)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/Lall year001
pHmonthly averagereport only (SU)all year001
Solids, total suspendedmonthly average≤ 80 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 120 mg/Lall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 12.4 mg/Lall year001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
E. colimonthly geometric mean≤ 3843 #/100mLJan001
E. colimonthly geometric mean≤ 427 #/100mLJun001
E. colimonthly geometric mean≤ 427 #/100mLAug001
E. colimonthly geometric mean≤ 3843 #/100mLFeb001
E. colimonthly geometric mean≤ 3843 #/100mLMar001
E. colimonthly geometric mean≤ 427 #/100mLMay001
E. colimonthly geometric mean≤ 427 #/100mLSep001
E. colimonthly geometric mean≤ 3843 #/100mLDec001
E. colimonthly geometric mean≤ 427 #/100mLJul001
E. colimonthly geometric mean≤ 3843 #/100mLOct001
E. colimonthly geometric mean≤ 3843 #/100mLNov001
E. colimonthly geometric mean≤ 427 #/100mLApr001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year002
Solids, total suspendedmonthly averagereport only (mg/L)all year002
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year002
Phosphorus, total [as P]monthly averagereport only (mg/L)all year002

How strict are these limits?

Cited limits by parameter: Kansas'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/KS0022675 · MCP: https://passage-data.com/mcp