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Cincinnati-Northern Kentucky International Airport

Airports, Flying Fields, & Services, Hebron, Kentucky. NPDES permit KY0082864, in force until Sep 30, 2031. Last 12 months: over a limit 5 times (last February 2026). Source: EPA ECHO, Oct 22, 2026.

Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 3 of 48 reports late

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

Period endingOutfallParameterReportedLimitOver by
December 2025003Oil & Grease, daily maximum51.2 mg/L≤ 15 mg/L241%
December 2025003Oil & Grease, monthly average16.23 mg/L≤ 10 mg/L62%
February 2026006BOD, 5-day, 20 deg. C, daily maximum100 mg/L≤ 85 mg/L18%
February 2026006Solids, total suspended, daily maximum107 mg/L≤ 60 mg/L78%
February 2026006Solids, total suspended, monthly average31.93 mg/L≤ 30 mg/L6%

Limits in force (119)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/Lall year002
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year002
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendedmonthly averagereport only (mg/L)all year002
Solids, total suspendeddaily maximum≤ 100 mg/Lall year002
Oil & Greasemonthly averagereport only (mg/L)all year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Carbon, tot organic [TOC]monthly averagereport only (mg/L)all year002
Carbon, tot organic [TOC]daily maximumreport only (mg/L)all year002
Potassium, total [as K]monthly averagereport only (mg/L)all year002
Potassium, total [as K]daily maximumreport only (mg/L)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Propylene glycol, totalmonthly averagereport only (mg/L)all year002
Propylene glycol, totaldaily maximumreport only (mg/L)all year002
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/LMay–Oct003
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/LJan, Feb, Mar, Apr, Nov, Dec003
BOD, 5-day, 20 deg. Cmonthly average≤ 70 mg/LMay–Oct003
BOD, 5-day, 20 deg. Cmonthly average≤ 150 mg/LJan, Feb, Mar, Apr, Nov, Dec003
BOD, 5-day, 20 deg. Cdaily maximum≤ 70 mg/LMay–Oct003
BOD, 5-day, 20 deg. Cdaily maximum≤ 150 mg/LJan, Feb, Mar, Apr, Nov, Dec003
pHminimum≥ 6 SUJan, Feb, Mar, Apr, Nov, Dec003
pHminimum≥ 6 SUMay–Oct003
pHmaximum≤ 9 SUJan, Feb, Mar, Apr, Nov, Dec003
pHmaximum≤ 9 SUMay–Oct003
Solids, total suspendedmonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec003
Solids, total suspendedmonthly averagereport only (mg/L)May–Oct003
Solids, total suspendeddaily maximum≤ 100 mg/LJan, Feb, Mar, Apr, Nov, Dec003
Solids, total suspendeddaily maximum≤ 100 mg/LMay–Oct003
Oil & Greasemonthly averagereport only (mg/L)May–Oct003
Oil & Greasemonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec003
Oil & Greasedaily maximum≤ 15 mg/LMay–Oct003
Oil & Greasedaily maximum≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec003
Carbon, tot organic [TOC]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec003
Carbon, tot organic [TOC]monthly averagereport only (mg/L)May–Oct003
Carbon, tot organic [TOC]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec003
Carbon, tot organic [TOC]daily maximumreport only (mg/L)May–Oct003
Potassium, total [as K]monthly averagereport only (mg/L)May–Oct003
Potassium, total [as K]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec003
Potassium, total [as K]daily maximumreport only (mg/L)May–Oct003
Potassium, total [as K]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)May–Oct003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)May–Oct003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec003
Propylene glycol, totalmonthly averagereport only (mg/L)May–Oct003
Propylene glycol, totalmonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec003
Propylene glycol, totaldaily maximumreport only (mg/L)May–Oct003
Propylene glycol, totaldaily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec003
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/LMay–Oct005
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/LJan, Feb, Mar, Apr, Nov, Dec005
BOD, 5-day, 20 deg. Cmonthly average≤ 50 mg/LMay–Oct005
BOD, 5-day, 20 deg. Cmonthly average≤ 85 mg/LJan, Feb, Mar, Apr, Nov, Dec005
BOD, 5-day, 20 deg. Cdaily maximum≤ 50 mg/LMay–Oct005
BOD, 5-day, 20 deg. Cdaily maximum≤ 85 mg/LJan, Feb, Mar, Apr, Nov, Dec005
pHminimum≥ 6 SUJan, Feb, Mar, Apr, Nov, Dec005
pHminimum≥ 6 SUMay–Oct005
pHmaximum≤ 9 SUJan, Feb, Mar, Apr, Nov, Dec005
pHmaximum≤ 9 SUMay–Oct005
Solids, total suspendedmonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec005
Solids, total suspendedmonthly averagereport only (mg/L)May–Oct005
Solids, total suspendeddaily maximum≤ 100 mg/LJan, Feb, Mar, Apr, Nov, Dec005
Solids, total suspendeddaily maximum≤ 100 mg/LMay–Oct005
Oil & Greasemonthly averagereport only (mg/L)May–Oct005
Oil & Greasemonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec005
Oil & Greasedaily maximum≤ 15 mg/LMay–Oct005
Oil & Greasedaily maximum≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec005
Carbon, tot organic [TOC]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec005
Carbon, tot organic [TOC]monthly averagereport only (mg/L)May–Oct005
Carbon, tot organic [TOC]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec005
Carbon, tot organic [TOC]daily maximumreport only (mg/L)May–Oct005
Potassium, total [as K]monthly averagereport only (mg/L)May–Oct005
Potassium, total [as K]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec005
Potassium, total [as K]daily maximumreport only (mg/L)May–Oct005
Potassium, total [as K]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)May–Oct005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)May–Oct005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec005
Propylene glycol, totalmonthly averagereport only (mg/L)May–Oct005
Propylene glycol, totalmonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec005
Propylene glycol, totaldaily maximumreport only (mg/L)May–Oct005
Propylene glycol, totaldaily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec005
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/LMay–Oct006
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/LJan, Feb, Mar, Apr, Nov, Dec006
BOD, 5-day, 20 deg. Cmonthly average≤ 50 mg/LMay–Oct006
BOD, 5-day, 20 deg. Cmonthly average≤ 85 mg/LJan, Feb, Mar, Apr, Nov, Dec006
BOD, 5-day, 20 deg. Cdaily maximum≤ 50 mg/LMay–Oct006
BOD, 5-day, 20 deg. Cdaily maximum≤ 85 mg/LJan, Feb, Mar, Apr, Nov, Dec006
pHminimum≥ 6 SUJan, Feb, Mar, Apr, Nov, Dec006
pHminimum≥ 6 SUMay–Oct006
pHmaximum≤ 9 SUJan, Feb, Mar, Apr, Nov, Dec006
pHmaximum≤ 9 SUMay–Oct006
Solids, total suspendedmonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec006
Solids, total suspendedmonthly averagereport only (mg/L)May–Oct006
Solids, total suspendeddaily maximum≤ 100 mg/LJan, Feb, Mar, Apr, Nov, Dec006
Solids, total suspendeddaily maximum≤ 100 mg/LMay–Oct006
Oil & Greasemonthly averagereport only (mg/L)May–Oct006
Oil & Greasemonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec006
Oil & Greasedaily maximum≤ 15 mg/LMay–Oct006
Oil & Greasedaily maximum≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec006
Carbon, tot organic [TOC]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec006
Carbon, tot organic [TOC]monthly averagereport only (mg/L)May–Oct006
Carbon, tot organic [TOC]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec006
Carbon, tot organic [TOC]daily maximumreport only (mg/L)May–Oct006
Potassium, total [as K]monthly averagereport only (mg/L)May–Oct006
Potassium, total [as K]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec006
Potassium, total [as K]daily maximumreport only (mg/L)May–Oct006
Potassium, total [as K]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec006
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)May–Oct006
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec006
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)May–Oct006
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec006
Propylene glycol, totalmonthly averagereport only (mg/L)May–Oct006
Propylene glycol, totalmonthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec006
Propylene glycol, totaldaily maximumreport only (mg/L)May–Oct006
Propylene glycol, totaldaily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec006

How strict are these limits?

Cited limits by parameter: Kentucky's rules and the federal ones.

Same industry: the 8 Transportation by Air permits in Kentucky.

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Your permit document is the final word. As JSON: /api/v1/permits/KY0082864 · MCP: https://passage-data.com/mcp