Butler STP

NPDES permit KY0021041 · Minor POTW · administratively continued, expires 2026-07-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2026-07-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

14values over a limit
0required values missing, on 0 form(s)
0of 14 forms filed late

Last period with anything received: 2026-07-31. Most often over: E. coli (5), Solids, total suspended (5), Solids, suspended percent removal (2).

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among KY permits in EPA's filings — check your permit).

Limits in force (50)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitAVERAGE report only all year
001Temperature, water deg. fahrenheitMAXIMUM report only all year
001Oxygen, dissolved [DO]INST MIN >= 6 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CMX WK AV <= 45 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 35 lb/d all year
001BOD, 5-day, 20 deg. CMX WK AV <= 52.5 lb/d all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CMX WK AV report only all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedMX WK AV <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 35 lb/d all year
001Solids, total suspendedMX WK AV <= 52.5 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedMX WK AV report only all year
001Oil & GreaseAVERAGE report only all year
001Oil & GreaseMAXIMUM report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]MO AVG <= 20 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX <= 30 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= 23.4 lb/d all year
001Nitrogen, ammonia total [as N]MX WK AV <= 35.1 lb/d all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]AVERAGE report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]MAXIMUM report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Hardness, total [as CaCO3]MO AVG report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualMO AVG <= .011 mg/L all year
001Chlorine, total residualDAILY MX <= .019 mg/L all year
001E. coli30DA GEO <= 130 #/100mL all year
001E. coli7 DA GEO <= 240 #/100mL all year
001Nitrogen, Kjeldahl TotalAVERAGE report only all year
001Nitrogen, Kjeldahl TotalMAXIMUM report only all year
001Nitrite Plus Nitrate TotalAVERAGE report only all year
001Nitrite Plus Nitrate TotalMAXIMUM report only all year
001Toxicity, final conc toxicity unitsMAXIMUM <= 1 tox acute all year
001Solids, total dissolved [TDS]AVERAGE report only all year
001Solids, total dissolved [TDS]MAXIMUM report only all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states