Century Aluminum of Kentucky LLC - Sebree

NPDES permit KY0004278 · Major NON-POTW · effective, expires 2027-06-30 · 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.

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

2values over a limit
0required values missing, on 0 form(s)
13of 64 forms filed late

Last period with anything received: 2026-07-31. Most often over: pH (2).

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (64)

OutfallParameterStatisticLimitMonths
002Temperature, water deg. fahrenheitMO AVG report only all year
002Temperature, water deg. fahrenheitDAILY MX <= 89 deg F all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspendedMO AVG <= 30 mg/L all year
002Solids, total suspendedDAILY MX <= 60 mg/L all year
002Oil & GreaseMO AVG <= 10 mg/L all year
002Oil & GreaseDAILY MX <= 15 mg/L all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
003Temperature, water deg. fahrenheitMO AVG report only all year
003Temperature, water deg. fahrenheitDAILY MX <= 89 deg F all year
003pHMINIMUM >= 6 SU all year
003pHMAXIMUM <= 9 SU all year
003Solids, total suspendedMO AVG <= 30 mg/L all year
003Solids, total suspendedDAILY MX <= 60 mg/L all year
003Oil & GreaseMO AVG <= 10 mg/L all year
003Oil & GreaseDAILY MX <= 15 mg/L all year
003Hardness, total [as CaCO3]DAILY MX report only all year
003Nickel, total recoverableDAILY MX report only all year
003Zinc, total recoverableDAILY MX report only all year
003Cadmium, total recoverableDAILY MX report only all year
003Flow, in conduit or thru treatment plantMO AVG report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
004Temperature, water deg. fahrenheitMO AVG report only all year
004Temperature, water deg. fahrenheitDAILY MX <= 89 deg F all year
004pHMINIMUM >= 6 SU all year
004pHMAXIMUM <= 9 SU all year
004Solids, total suspendedMO AVG <= 30 mg/L all year
004Solids, total suspendedDAILY MX <= 60 mg/L all year
004Oil & GreaseMO AVG <= 10 mg/L all year
004Oil & GreaseDAILY MX <= 15 mg/L all year
004Hardness, total [as CaCO3]DAILY MX report only all year
004Cadmium, total recoverableDAILY MX report only all year
004Flow, in conduit or thru treatment plantMO AVG report only all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
004Chlorine, total residualMO AVG <= .011 mg/L all year
004Chlorine, total residualDAILY MX <= .019 mg/L all year
006pHMINIMUM >= 6 SU all year
006pHMAXIMUM <= 9 SU all year
006Solids, total suspendedMO AVG <= 30 mg/L all year
006Solids, total suspendedDAILY MX <= 60 mg/L all year
006Oil & GreaseMO AVG <= 10 mg/L all year
006Oil & GreaseDAILY MX <= 15 mg/L all year
006Flow, in conduit or thru treatment plantMO AVG report only all year
006Flow, in conduit or thru treatment plantDAILY MX report only all year
007pHMINIMUM >= 6 SU all year
007pHMAXIMUM <= 9 SU all year
007Solids, total suspendedMO AVG <= 30 mg/L all year
007Solids, total suspendedDAILY MX <= 60 mg/L all year
007Oil & GreaseMO AVG <= 10 mg/L all year
007Oil & GreaseDAILY MX <= 15 mg/L all year
007Flow, in conduit or thru treatment plantMO AVG report only all year
007Flow, in conduit or thru treatment plantDAILY MX report only all year
010pHMINIMUM >= 6 SU all year
010pHMAXIMUM <= 9 SU all year
010Solids, total suspendedMO AVG <= 30 mg/L all year
010Solids, total suspendedDAILY MX <= 60 mg/L all year
010Oil & GreaseMO AVG <= 10 mg/L all year
010Oil & GreaseDAILY MX <= 15 mg/L all year
010Iron, total recoverableDAILY MX <= 4 mg/L all year
010Flow, in conduit or thru treatment plantMO AVG report only all year
010Flow, in conduit or thru treatment plantDAILY MX report only all year
010Toxicity, final conc toxicity unitsMAXIMUM <= 1 tox acute 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