ENTERGY MISSISSIPPI ATTALA PLANT

NPDES permit MS0056928 · Major NON-POTW · effective, expires 2028-10-31 · 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.

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

0values over a limit
0required values missing, on 0 form(s)
0of 24 forms filed late

Last period with anything received: 2026-08-31.

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 (36)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitDAILY MX report only all year
001Temperature, water deg. fahrenheitMO AVG report only May, Jun, Jul, Aug, Sep, Oct
001Temperature, water deg. fahrenheitDAILY MX report only May, Jun, Jul, Aug, Sep, Oct
001Temperature, water deg. fahrenheitMO AVG report only May, Jun, Jul, Aug, Sep, Oct
001Temperature, water deg. fahrenheitDAILY MX report only May, Jun, Jul, Aug, Sep, Oct
001Temp. diff. between samp. & upstrm deg. FDAILY MX <= 5 deg F May, Jun, Jul, Aug, Sep, Oct
001Specific conductanceMO AVG report only all year
001Specific conductanceDAILY MX report only all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Zinc, total recoverableMO AVG <= 1 mg/L all year
001Zinc, total recoverableDAILY MX <= 1 mg/L all year
001Zinc, total recoverableMO AVG <= 12.18 lb/d all year
001Zinc, total recoverableDAILY MX <= 12.18 lb/d all year
001Chromium, total recoverableMO AVG <= .2 mg/L all year
001Chromium, total recoverableDAILY MX <= .2 mg/L all year
001Chromium, total recoverableMO AVG <= 2.44 lb/d all year
001Chromium, total recoverableDAILY MX <= 2.44 lb/d 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 <= .1 mg/L all year
001Chlorine, total residualDAILY MX <= .1 mg/L all year
001Chlorine, free availableMO AVG <= .035 mg/L all year
001Chlorine, free availableDAILY MX <= .035 mg/L all year
002pHMINIMUM >= 6 SU all year
002pHMO MAX <= 9 SU all year
002Solids, total suspendedMO AVG <= 30 mg/L all year
002Solids, total suspendedMO MAX <= 100 mg/L all year
002Solids, total suspendedMO AVG <= 18 lb/d all year
002Solids, total suspendedMO MAX <= 60 lb/d all year
002Oil & GreaseMO AVG <= 15 mg/L all year
002Oil & GreaseMO MAX <= 20 mg/L all year
002Oil & GreaseMO AVG <= 9 lb/d all year
002Oil & GreaseMO MAX <= 12 lb/d all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantMO MAX report only 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