Duke Energy Carolinas LLC - Catawba Nuclear Station

NPDES permit SC0004278 · Major NON-POTW · administratively continued, expires 2023-12-31 · 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 2023-12-31 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

0values over a limit
0required values missing, on 0 form(s)
0of 67 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 29 days after each monitoring period ends (the most common figure among SC permits in EPA's filings — check your permit).

Limits in force (77)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitMO AVG report only all year
001Temperature, water deg. fahrenheitMO AVG report only all year
001Temp. diff. between samp. & upstrm deg. FMO AVG <= 10 deg F Apr, May, Jun, Jul, Aug, Sep
001Temp. diff. between samp. & upstrm deg. FMO AVG <= 14 deg F Jan, Feb, Mar, Oct, Nov, Dec
001pHINST MIN report only all year
001pHINST MAX report only all year
001Copper, total [as Cu]MO AVG <= 36.8 ug/L all year
001Copper, total [as Cu]DAILY MX <= 48.3 ug/L 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 <= 11 ug/L all year
001Chlorine, total residualDAILY MX <= 19 ug/L all year
001Chlorine, free availableMO AVG <= .2 mg/L all year
001Chlorine, free availableDAILY MX <= .5 mg/L all year
001Algae, presenceINST MIN report only all year
001Algae, presenceINST MAX report only all year
001LC50 Static 48Hr Acute Ceriodaphnia dubiaMINIMUM report only all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AVG = 25 % all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX = 40 % all year
001Pass/Fail Static 48Hr Acute Ceriodaphnia dubiaDAILY MX = 0 pass=0;fail=1 all year
001IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiaMINIMUM report only all year
002BOD, 5-day, 20 deg. CMO AVG report only all year
002BOD, 5-day, 20 deg. CDAILY MX report only all year
002pHINST MIN report only all year
002pHINST MAX report only all year
002Solids, total suspendedMO AVG <= 30 mg/L all year
002Solids, total suspendedDAILY MX <= 100 mg/L all year
002Oil & GreaseMO AVG <= 15 mg/L all year
002Oil & GreaseDAILY MX <= 20 mg/L all year
002Hardness, total [as CaCO3]MO AVG report only all year
002Hardness, total [as CaCO3]DAILY MX report only all year
002Cadmium, total [as Cd]MO AVG report only all year
002Cadmium, total [as Cd]DAILY MX report only all year
002Copper, total [as Cu]MO AVG report only all year
002Copper, total [as Cu]DAILY MX report only all year
002Copper, total [as Cu]MO AVG = 47.1 ug/L all year
002Copper, total [as Cu]DAILY MX = 63.8 ug/L all year
002Iron, total [as Fe]MO AVG <= .635 mg/L all year
002Iron, total [as Fe]DAILY MX <= .635 mg/L all year
002Lead, total [as Pb]MO AVG report only all year
002Lead, total [as Pb]DAILY MX report only all year
002Zinc, total [as Zn]DAILY MX report only 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
002Chlorine, total residualMO AVG <= 11 ug/L all year
002Chlorine, total residualDAILY MX <= 19 ug/L all year
002Algae, presenceINST MIN report only all year
002Algae, presenceINST MAX report only all year
002HydrazineDAILY MX <= 77 ug/L all year
002Pass/Fail Static 48Hr Acute Ceriodaphnia dubiaDAILY MX <= 0 pass=0;fail=1 all year
006Temperature, water deg. fahrenheitMO AVG report only all year
006Temperature, water deg. fahrenheitDAILY MX report only all year
006Temperature, water deg. fahrenheitMO AVG report only all year
006Temperature, water deg. fahrenheitDAILY MX report only all year
006Temp. diff. between samp. & upstrm deg. FDAILY MX report only all year
006pHINST MIN report only all year
006pHINST MAX report only 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
006Chlorine, total residualMO AVG <= 11 ug/L all year
006Chlorine, total residualDAILY MX <= 19 ug/L all year
006Chlorine, free availableMO AVG <= .2 mg/L all year
006Chlorine, free availableDAILY MX <= .5 mg/L all year
006Algae, presenceINST MIN report only all year
006Algae, presenceINST MAX report only all year
01ACopper, total [as Cu]MO AVG <= 1 mg/L all year
01ACopper, total [as Cu]DAILY MX <= 1 mg/L all year
01AIron, total [as Fe]MO AVG <= 1 mg/L all year
01AIron, total [as Fe]DAILY MX <= 1 mg/L all year
01AFlow, in conduit or thru treatment plantMO AVG report only all year
01AFlow, in conduit or thru treatment plantDAILY MX report only all year
01BpHINST MIN >= 6 SU all year
01BpHINST MAX <= 9 SU all year
01BFlow, in conduit or thru treatment plantMO AVG report only all year
01BFlow, in conduit or thru treatment plantDAILY MX report only all year
01BChlorine, free availableMO AVG <= .2 mg/L all year
01BChlorine, free availableDAILY MX <= .5 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