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Derby, City of

Sewage treatment plant, major discharger, Derby, Kansas. NPDES permit KS0050377, in force until Dec 31, 2027. Last 12 months: over a limit 28 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: outfall 001 form A monthly (24 values), outfall 002 form A monthly (4 values), outfall 001 form B yearly, outfall 001 form W yearly
Renewal application due
Jul 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
20 values over a limit, 0 required values missing, 0 of 26 reports late

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

All 28 values over a limit
Period endingParameterReportedLimitOver by
October 2025E. coli, monthly geometric mean6340.36671 #/100mL≤ 262 #/100mL2320%
October 2025E. coli, weekly geometric mean6340.36671 #/100mL≤ 4348 #/100mL46%
October 2025Nitrogen, ammonia total [as N], daily maximum29.4 mg/L≤ 8.5 mg/L246%
October 2025Nitrogen, ammonia total [as N], monthly average24.55 mg/L≤ 5.2 mg/L372%
October 2025Phosphorus, Total As P, EPA's "DPD AVG"21.56584 lb/d≤ 20.88 lb/d3%
November 2025Nitrogen, ammonia total [as N], daily maximum27.9 mg/L≤ 12.6 mg/L121%
November 2025Nitrogen, ammonia total [as N], monthly average27.25 mg/L≤ 8.5 mg/L221%
December 2025Nitrogen, ammonia total [as N], daily maximum18.4 mg/L≤ 12.6 mg/L46%
December 2025Nitrogen, ammonia total [as N], monthly average16.65 mg/L≤ 9.1 mg/L83%
December 2025Phosphorus, Total As P, EPA's "DPD AVG"21.32626 lb/d≤ 20.88 lb/d2%
January 2026Nitrogen, ammonia total [as N], daily maximum21.1 mg/L≤ 12.6 mg/L67%
January 2026Nitrogen, ammonia total [as N], monthly average20 mg/L≤ 9.1 mg/L120%
January 2026Phosphorus, Total As P, EPA's "DPD AVG"21.96893 lb/d≤ 20.88 lb/d5%
February 2026Nitrogen, ammonia total [as N], daily maximum19.8 mg/L≤ 12.6 mg/L57%
February 2026Nitrogen, ammonia total [as N], monthly average19.45 mg/L≤ 9.1 mg/L114%
February 2026Phosphorus, Total As P, EPA's "DPD AVG"22.38849 lb/d≤ 20.88 lb/d7%
March 2026Nitrogen, ammonia total [as N], daily maximum25.3 mg/L≤ 12.6 mg/L101%
March 2026Nitrogen, ammonia total [as N], monthly average20.6 mg/L≤ 7.6 mg/L171%
March 2026Phosphorus, Total As P, EPA's "DPD AVG"22.12469 lb/d≤ 20.88 lb/d6%
April 2026Nitrogen, ammonia total [as N], daily maximum17.2 mg/L≤ 7.6 mg/L126%
April 2026Nitrogen, ammonia total [as N], monthly average9.435 mg/L≤ 4.7 mg/L101%
April 2026Phosphorus, Total As P, EPA's "DPD AVG"22.3564 lb/d≤ 20.88 lb/d7%
June 2026Nitrogen, ammonia total [as N], daily maximum7.01 mg/L≤ 4 mg/L75%
June 2026Nitrogen, ammonia total [as N], monthly average5.455 mg/L≤ 2.6 mg/L110%
July 2026Nitrogen, ammonia total [as N], daily maximum13.5 mg/L≤ 3.4 mg/L297%
July 2026Nitrogen, ammonia total [as N], monthly average11.75 mg/L≤ 2.3 mg/L411%
August 2026Phosphorus, Total As P, EPA's "DPD AVG"29.49509 lb/d≤ 20.88 lb/d41%
September 2026Phosphorus, Total As P, EPA's "DPD AVG"34.63921 lb/d≤ 20.88 lb/d66%

Limits in force (111)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LJun001
BOD, 5-day, 20 deg. Cmonthly average≤ 25 mg/LSep001
BOD, 5-day, 20 deg. Cmonthly average≤ 25 mg/LOct001
BOD, 5-day, 20 deg. Cmonthly average≤ 25 mg/LApr001
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LJul001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LFeb001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LMar001
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≤ 25 mg/LMay001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LNov001
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LAug001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 30 mg/LJun001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 40 mg/LSep001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 40 mg/LOct001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 40 mg/LApr001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 30 mg/LJul001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/LFeb001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/LMar001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/LJan001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/LDec001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 40 mg/LMay001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/LNov001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 30 mg/LAug001
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≤ 4.7 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 9.1 mg/LDec001
Nitrogen, ammonia total [as N]monthly average≤ 5.2 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ 2.2 mg/LAug001
Nitrogen, ammonia total [as N]monthly average≤ 3.4 mg/LSep001
Nitrogen, ammonia total [as N]monthly average≤ 9.1 mg/LFeb001
Nitrogen, ammonia total [as N]monthly average≤ 8.5 mg/LNov001
Nitrogen, ammonia total [as N]monthly average≤ 3.5 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 7.6 mg/LMar001
Nitrogen, ammonia total [as N]monthly average≤ 2.3 mg/LJul001
Nitrogen, ammonia total [as N]monthly average≤ 2.6 mg/LJun001
Nitrogen, ammonia total [as N]monthly average≤ 9.1 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 7.6 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 12.6 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 5.4 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 12.6 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 12.6 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 5.5 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 12.6 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 12.6 mg/LJan001
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
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year001
Chloride [as Cl]monthly averagereport only (mg/L)all year001
Chloride [as Cl]monthly averagereport only (lb/d)all year001
Arsenic, total recoverablemonthly averagereport only (ug/L)all year001
Selenium, total recoverablemonthly averagereport only (ug/L)all year001
Thallium, total recoverablemonthly averagereport only (ug/L)all year001
Beryllium, total recoverable [as Be]monthly averagereport only (ug/L)all year001
Nickel, total recoverablemonthly averagereport only (ug/L)all year001
Silver total recoverablemonthly averagereport only (ug/L)all year001
Zinc, total recoverablemonthly averagereport only (ug/L)all year001
Cadmium, total recoverablemonthly averagereport only (ug/L)all year001
Lead, total recoverablemonthly averagereport only (ug/L)all year001
Chromium, total recoverablemonthly averagereport only (ug/L)all year001
Copper, total recoverablemonthly averagereport only (ug/L)all year001
Antimony, total recoverablemonthly averagereport only (ug/L)all year001
Priority Pollutantsmonthly averagereport only (mg/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
E. colimonthly geometric mean≤ 2358 #/100mLDec001
E. colimonthly geometric mean≤ 262 #/100mLOct001
E. colimonthly geometric mean≤ 2358 #/100mLFeb001
E. colimonthly geometric mean≤ 262 #/100mLApr001
E. colimonthly geometric mean≤ 262 #/100mLSep001
E. colimonthly geometric mean≤ 2358 #/100mLNov001
E. colimonthly geometric mean≤ 2358 #/100mLMar001
E. colimonthly geometric mean≤ 262 #/100mLJul001
E. colimonthly geometric mean≤ 262 #/100mLAug001
E. colimonthly geometric mean≤ 262 #/100mLJun001
E. colimonthly geometric mean≤ 2358 #/100mLJan001
E. colimonthly geometric mean≤ 262 #/100mLMay001
E. coliweekly geometric meanreport only (#/100mL)Dec001
E. coliweekly geometric mean≤ 4348 #/100mLOct001
E. coliweekly geometric meanreport only (#/100mL)Feb001
E. coliweekly geometric mean≤ 4348 #/100mLApr001
E. coliweekly geometric mean≤ 4348 #/100mLSep001
E. coliweekly geometric meanreport only (#/100mL)Nov001
E. coliweekly geometric meanreport only (#/100mL)Mar001
E. coliweekly geometric mean≤ 4348 #/100mLJul001
E. coliweekly geometric mean≤ 4348 #/100mLAug001
E. coliweekly geometric mean≤ 4348 #/100mLJun001
E. coliweekly geometric meanreport only (#/100mL)Jan001
E. coliweekly geometric mean≤ 4348 #/100mLMay001
Nitrogen, Total As Ndaily averagereport only (mg/L)all year001
Nitrogen, Total As NEPA's "DPD AVG"report only (lb/d)all year001
Phosphorus, Total As Pdaily averagereport only (mg/L)all year001
Phosphorus, Total As PEPA's "DPD AVG"≤ 20.88 lb/dall year001
Nitrite + Nitrate total [as N]daily average≤ 10 mg/Lall year001
Mercury, total [as Hg]monthly averagereport only (ug/L)all year001
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimum≥ 17 %all year001
IC25 Static Renewal 7 Day Chronic Pimephalesdaily minimum≥ 17 %all year001
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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/KS0050377 · MCP: https://passage-data.com/mcp