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Lexington West Hickman STP

Sewage treatment plant, major discharger, Nicholasville, Kentucky. NPDES permit KY0021504 expired Dec 31, 2006; its limits still apply. Last 12 months: over a limit once (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form 3 monthly (33 values), form Y quarterly (19 values), form P4 yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
May 2026Phosphorus, total [as P], daily maximum2.7 mg/L≤ 2 mg/L35%

Limits in force (126)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 7 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 8474 lb/dall year
Solids, total suspendedmaximum weekly average≤ 12711 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmaximum weekly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Solids, total suspendedmaximum weekly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 6 mg/LMay–Oct
Nitrogen, ammonia total [as N]maximum weekly average≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1130 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 2825 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 1695 lb/dMay–Oct
Nitrogen, ammonia total [as N]maximum weekly average≤ 4237 lb/dJan, Feb, Mar, Apr, Nov, Dec
Phosphorus, total [as P]monthly averagereport only (mg/L)May–Oct
Phosphorus, total [as P]monthly average≤ 1 mg/LMay–Oct
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)May–Oct
Phosphorus, total [as P]daily maximum≤ 2 mg/LMay–Oct
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Cyanide, free [amenable to chlorination]monthly averagereport only (mg/L)all year
Cyanide, free [amenable to chlorination]daily maximumreport only (mg/L)all year
Cyanide, free [amenable to chlorination]monthly averagereport only (mg/L)all year
Cyanide, free [amenable to chlorination]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Chloride [as Cl]monthly averagereport only (mg/L)all year
Chloride [as Cl]daily maximumreport only (mg/L)all year
Chloride [as Cl]monthly averagereport only (mg/L)all year
Chloride [as Cl]daily maximumreport only (mg/L)all year
Arsenic, total recoverablemonthly averagereport only (mg/L)all year
Arsenic, total recoverabledaily maximumreport only (mg/L)all year
Arsenic, total recoverablemonthly averagereport only (mg/L)all year
Arsenic, total recoverabledaily maximumreport only (mg/L)all year
Iron, total recoverablemonthly averagereport only (mg/L)all year
Iron, total recoverabledaily maximumreport only (mg/L)all year
Iron, total recoverablemonthly averagereport only (mg/L)all year
Iron, total recoverabledaily maximumreport only (mg/L)all year
Selenium, total recoverablemonthly averagereport only (mg/L)all year
Selenium, total recoverabledaily maximumreport only (mg/L)all year
Selenium, total recoverablemonthly averagereport only (mg/L)all year
Selenium, total recoverabledaily maximumreport only (mg/L)all year
Cadmium, dissolved [as Cd]monthly averagereport only (mg/L)all year
Cadmium, dissolved [as Cd]daily maximumreport only (mg/L)all year
Copper, dissolved [as Cu]monthly averagereport only (mg/L)all year
Copper, dissolved [as Cu]daily maximumreport only (mg/L)all year
Lead, dissolved [as Pb]monthly averagereport only (mg/L)all year
Lead, dissolved [as Pb]daily maximumreport only (mg/L)all year
Nickel, total recoverablemonthly averagereport only (mg/L)all year
Nickel, total recoverabledaily maximumreport only (mg/L)all year
Nickel, total recoverablemonthly averagereport only (mg/L)all year
Nickel, total recoverabledaily maximumreport only (mg/L)all year
Silver total recoverablemonthly averagereport only (mg/L)all year
Silver total recoverabledaily maximumreport only (mg/L)all year
Silver total recoverablemonthly averagereport only (mg/L)all year
Silver total recoverabledaily maximumreport only (mg/L)all year
Zinc, dissolved [as Zn]monthly averagereport only (mg/L)all year
Zinc, dissolved [as Zn]daily maximumreport only (mg/L)all year
Zinc, total recoverablemonthly averagereport only (mg/L)all year
Zinc, total recoverablemonthly averagereport only (mg/L)all year
Zinc, total recoverabledaily maximumreport only (mg/L)all year
Zinc, total recoverabledaily maximumreport only (mg/L)all year
Zinc, total recoverablemonthly averagereport only (mg/L)all year
Zinc, total recoverabledaily maximumreport only (mg/L)all year
Cadmium, total recoverablemonthly averagereport only (mg/L)all year
Cadmium, total recoverablemonthly averagereport only (mg/L)all year
Cadmium, total recoverabledaily maximumreport only (mg/L)all year
Cadmium, total recoverabledaily maximumreport only (mg/L)all year
Cadmium, total recoverablemonthly averagereport only (mg/L)all year
Cadmium, total recoverabledaily maximumreport only (mg/L)all year
Lead, total recoverablemonthly averagereport only (mg/L)all year
Lead, total recoverablemonthly averagereport only (mg/L)all year
Lead, total recoverabledaily maximumreport only (mg/L)all year
Lead, total recoverabledaily maximumreport only (mg/L)all year
Lead, total recoverablemonthly averagereport only (mg/L)all year
Lead, total recoverabledaily maximumreport only (mg/L)all year
Chromium, total recoverablemonthly averagereport only (mg/L)all year
Chromium, total recoverabledaily maximumreport only (mg/L)all year
Chromium, total recoverablemonthly averagereport only (mg/L)all year
Chromium, total recoverabledaily maximumreport only (mg/L)all year
Copper, total recoverablemonthly averagereport only (mg/L)all year
Copper, total recoverablemonthly averagereport only (mg/L)all year
Copper, total recoverabledaily maximumreport only (mg/L)all year
Copper, total recoverabledaily maximumreport only (mg/L)all year
Copper, total recoverablemonthly averagereport only (mg/L)all year
Copper, total recoverabledaily maximumreport only (mg/L)all year
Oil and greasemonthly averagereport only (mg/L)all year
Oil and greasedaily maximumreport only (mg/L)all year
Oil and greasemonthly averagereport only (mg/L)all year
Oil and greasedaily maximumreport only (mg/L)all year
Phenolics, totalmonthly averagereport only (mg/L)all year
Phenolics, totaldaily maximumreport only (mg/L)all year
Phenolics, totalmonthly averagereport only (mg/L)all year
Phenolics, totaldaily maximumreport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residual30-day average≤ .011 mg/Lall year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Toxicity, final conc toxicity unitsdaily maximum≤ 1 tox chronicall year
Mercury, total recoverablemonthly averagereport only (mg/L)all year
Mercury, total recoverabledaily maximumreport only (mg/L)all year
Mercury, total recoverablemonthly averagereport only (mg/L)all year
Mercury, total recoverabledaily maximumreport only (mg/L)all year
Coliform, fecal general30-day geometric mean≤ 200 #/100mLall year
Coliform, fecal general7-day geometric mean≤ 400 #/100mLall year
Chromium, hexavalent tot recoverablemonthly averagereport only (mg/L)all year
Chromium, hexavalent tot recoverabledaily maximumreport only (mg/L)all year
Chromium, hexavalent tot recoverablemonthly averagereport only (mg/L)all year
Chromium, hexavalent tot recoverabledaily maximumreport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2825 lb/dall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 4237 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]maximum weekly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (lb/d)all year
BOD, carbonaceous [5 day, 20 C]maximum weekly averagereport only (lb/d)all year
BOD, carb-5 day, 20 deg C, percent removalmonthly minimum≥ 85 %all year
Solids, suspended percent removalmonthly minimum≥ 85 %all year

How strict are these limits?

Cited limits by parameter: Kentucky'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/KY0021504 · MCP: https://passage-data.com/mcp