Duke Energy Carolinas LLC

NPDES permit NC0004987 · Major NON-POTW · effective, expires 2027-03-31 · 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

10values over a limit
59required values missing, on 11 form(s)
5of 53 forms filed late

Last period with anything received: 2026-07-31. Most often over: Copper, total [as Cu] (8), Iron, total [as Fe] (2).

Reporting

Reports are due about 31 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (40)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigrade30DA AVG <= 34.4 deg C Jul, Aug, Sep, Oct
001Temperature, water deg. centigrade30DA AVG <= 33.3 deg C Jan, Feb, Mar, Nov, Dec
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, free available30DA AVG <= .2 mg/L all year
001Chlorine, free availableDAILY MX <= .5 mg/L all year
002TurbidityDAILY MX report only all year
002pHDAILY MN >= 6 SU all year
002pHDAILY MX <= 9 SU all year
002Solids, total suspended30DA AVG <= 20 mg/L all year
002Solids, total suspendedDAILY MX <= 50 mg/L all year
002Oil & Grease30DA AVG <= 9 mg/L all year
002Oil & GreaseDAILY MX <= 12 mg/L all year
002Hardness, total [as CaCO3]DAILY MX report only all year
002Arsenic, total [as As]DAILY MX report only all year
002Copper, total [as Cu]DAILY MX report only all year
002Iron, total [as Fe]DAILY MX report only all year
002Selenium, total [as Se]DAILY MX report only all year
002Flow, in conduit or thru treatment plantDAILY MX <= 4 MGD all year
002Bromide [as Br]DAILY MX report only all year
002Mercury, total [as Hg]DAILY MX report only all year
002Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX report only all year
005Temperature, water deg. centigradeDAILY MX report only all year
005ConductivityDAILY MX report only all year
005pHDAILY MN >= 6 SU all year
005pHDAILY MX <= 9 SU all year
005Solids, total suspended30DA AVG <= 30 mg/L all year
005Solids, total suspendedDAILY MX <= 50 mg/L all year
005Oil & Grease30DA AVG <= 15 mg/L all year
005Oil & GreaseDAILY MX <= 20 mg/L all year
005Arsenic, total [as As]DAILY MX report only all year
005Copper, total [as Cu]30DA AVG <= 1 mg/L all year
005Copper, total [as Cu]DAILY MX <= 1 mg/L all year
005Iron, total [as Fe]30DA AVG <= 1 mg/L all year
005Iron, total [as Fe]DAILY MX <= 1 mg/L all year
005Selenium, total [as Se]DAILY MX report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
005Mercury, total [as Hg]DAILY MX report only all year
006Flow, in conduit or thru treatment plantDAILY MX report only all year
008Oil & Grease30DA AVG <= 15 mg/L all year
008Oil & GreaseDAILY MX <= 20 mg/L 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