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Oswego, City of

Sewage treatment plant, Oswego, Kansas. NPDES permit KS0047554, in force until Sep 30, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: outfall 001 form A quarterly (8 values), outfall 002 form R quarterly (2 values), outfall 003 form A quarterly (2 values)
Renewal application due
Apr 3, 2028 · 180 days before expiry; your permit may set another date
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 1 required value missing, 1 of 20 reports late

Limits in force (15)

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, ammonia total [as N]monthly average≤ 5.2 mg/LOct–Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LJul–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 2.8 mg/LApr–Jun001
Nitrogen, ammonia total [as N]monthly average≤ 5.3 mg/LJan–Mar001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
E. colimonthly geometric meanreport only (#/100mL)all year001
Chlorine, total residualdaily minimum≥ .1 mg/Lall year002
E. colimonthly geometric mean≤ 262 #/100mLall year002
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year003
Solids, total suspendedmonthly averagereport only (mg/L)all year003

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/KS0047554 · MCP: https://passage-data.com/mcp