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Colby, City of

Sewage treatment plant, Colby, Kansas. NPDES permit KS0098698, in force until Sep 30, 2027. Last 12 months: over a limit once (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: outfall 001 form A monthly (22 values), outfall 002 form R monthly (2 values), outfall 003 form R monthly (2 values), outfall 004 form A monthly (5 values)
Renewal application due
Apr 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 0 of 48 reports late

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

Period endingParameterReportedLimitOver by
March 2026Nitrogen, ammonia total [as N], monthly average3.1 mg/L≤ 2.8 mg/L11%

Limits in force (75)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LDec001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LMar001
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LSep001
BOD, 5-day, 20 deg. Cmonthly average≤ 25 mg/LOct001
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LJun001
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LJul001
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LAug001
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LMay001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LNov001
BOD, 5-day, 20 deg. Cmonthly average≤ 25 mg/LApr001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LFeb001
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/LJan001
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/LDec001
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/LMar001
BOD, 5-day, 20 deg. Cdaily maximum≤ 30 mg/LSep001
BOD, 5-day, 20 deg. Cdaily maximum≤ 30 mg/LOct001
BOD, 5-day, 20 deg. Cdaily maximum≤ 30 mg/LJun001
BOD, 5-day, 20 deg. Cdaily maximum≤ 30 mg/LJul001
BOD, 5-day, 20 deg. Cdaily maximum≤ 30 mg/LAug001
BOD, 5-day, 20 deg. Cdaily maximum≤ 30 mg/LMay001
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/LNov001
BOD, 5-day, 20 deg. Cdaily maximum≤ 30 mg/LApr001
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/LFeb001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (lb/d)all year001
Nitrogen, ammonia total [as N]monthly average≤ .9 mg/LJul001
Nitrogen, ammonia total [as N]monthly average≤ 2.9 mg/LDec001
Nitrogen, ammonia total [as N]monthly average≤ 2.1 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 2.8 mg/LMar001
Nitrogen, ammonia total [as N]monthly average≤ 2.9 mg/LNov001
Nitrogen, ammonia total [as N]monthly average≤ 2.9 mg/LJan001
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/LAug001
Nitrogen, ammonia total [as N]monthly average≤ 2.9 mg/LFeb001
Nitrogen, ammonia total [as N]monthly average≤ 1.4 mg/LSep001
Nitrogen, ammonia total [as N]monthly average≤ 2.3 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ 1.4 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 9.3 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 8.2 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 9.3 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 9.3 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 9.3 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 9.3 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 5 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 9.1 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 4.9 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 3.8 mg/LJun001
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
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Arsenic, total [as As]monthly averagereport only (ug/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
E. colimonthly geometric mean≤ 3843 #/100mLall year001
Nitrogen, Total As Ndaily averagereport only (mg/L)all year001
Nitrogen, Total As NEPA's "DPD AVG"≤ 66.5 lb/dall year001
Phosphorus, Total As Pdaily averagereport only (mg/L)all year001
Phosphorus, Total As PEPA's "DPD AVG"report only (lb/d)all year001
Chlorine, total residualminimum weekly average≥ .1 mg/Lall year002
E. colimonthly geometric mean≤ 262 #/100mLall year002
Chlorine, total residualminimum weekly average≥ .1 mg/Lall year003
E. colimonthly geometric mean≤ 262 #/100mLall year003
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year004
Solids, total suspendedmonthly averagereport only (mg/L)all year004
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year004
Phosphorus, total [as P]monthly averagereport only (mg/L)all year004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004

New limits from Sep 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Phosphorus, Total As P, EPA's "DPD AVG"12.5 lb/dnew8.83 lb/d (12 values)0.706×

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/KS0098698 · MCP: https://passage-data.com/mcp