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Colwich, City of

Sewage treatment plant, Colwich, Kansas. NPDES permit KS0090956, in force until May 31, 2027. Last 12 months: over a limit 10 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: outfall 001 form A monthly (11 values), outfall 002 form A monthly (2 values)
Renewal application due
Dec 2, 2026 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
6 values over a limit, 0 required values missing, 0 of 24 reports late

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

Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, monthly average60.8 mg/L≤ 30 mg/L103%
October 2025BOD, 5-day, 20 deg. C, maximum weekly average60.8 mg/L≤ 45 mg/L35%
November 2025BOD, 5-day, 20 deg. C, monthly average39.4 mg/L≤ 30 mg/L31%
December 2025BOD, 5-day, 20 deg. C, monthly average47.6 mg/L≤ 30 mg/L59%
December 2025BOD, 5-day, 20 deg. C, maximum weekly average47.6 mg/L≤ 45 mg/L6%
February 2026BOD, 5-day, 20 deg. C, monthly average40.4 mg/L≤ 30 mg/L35%
August 2026BOD, 5-day, 20 deg. C, monthly average30.3 mg/L≤ 30 mg/L1%
August 2026Solids, total suspended, monthly average103 mg/L≤ 80 mg/L29%
September 2026BOD, 5-day, 20 deg. C, monthly average45.1 mg/L≤ 30 mg/L50%
September 2026BOD, 5-day, 20 deg. C, maximum weekly average45.1 mg/L≤ 45 mg/L0%

Limits in force (13)

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 averagereport only (mg/L)all 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 #/100mLall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year002
Solids, total suspendedmonthly averagereport only (mg/L)all year002

New limits from Mar 31, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average1.7 mg/L (Jul–Sep)new1.93 mg/L (3 values)1.14×
Nitrogen, ammonia total [as N], monthly average4.6 mg/L (Oct–Dec)new0.67 mg/L (3 values)0.146×
Nitrogen, ammonia total [as N], monthly average2.2 mg/L (Apr–Jun)new0.4567 mg/L (3 values)0.208×
Nitrogen, ammonia total [as N], monthly average4.6 mg/L (Jan–Mar)new3.33 mg/L (3 values)0.724×

Cited limits by parameter: Kansas'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/KS0090956 · MCP: https://passage-data.com/mcp