South Carolina Public Service Authority (Santee Cooper)

NPDES permit SC0037401 · Major NON-POTW · effective, expires 2029-02-28 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

0values over a limit
0required values missing, on 0 form(s)
0of 96 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 (70)

OutfallParameterStatisticLimitMonths
002Temperature, water deg. fahrenheitDAILY 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 <= 95 mg/L all year
002Oil & GreaseMO AVG <= 14 mg/L all year
002Oil & GreaseDAILY MX <= 19 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
002Mercury, total [as Hg]MO AVG <= 50 ng/L all year
002Mercury, total [as Hg]DAILY MX <= 73 ng/L all year
002Length of longest pH excursionINST MAX <= 60 min all year
002pH range excursions, monthly total accumMO MAX <= 446 min all year
002LC50 Static 48Hr Acute Ceriodaphnia dubiaDAILY MN report only all year
002%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AVG <= 25 % all year
002%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX <= 40 % all year
002IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MN report only all year
003Temperature, water deg. fahrenheitINST MAX <= 109 deg F all year
003pHINST MIN report only all year
003pHINST MAX 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
003Chlorine, free availableMO AVG <= .2 mg/L all year
003Chlorine, free availableDAILY MX <= .5 mg/L all year
003Length of longest pH excursionINST MAX <= 60 min all year
003pH range excursions, monthly total accumMO MAX <= 446 min all year
004Temperature, water deg. fahrenheitINST MAX <= 109 deg F all year
004pHINST MIN report only all year
004pHINST MAX 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, free availableMO AVG <= .2 mg/L all year
004Chlorine, free availableDAILY MX <= .5 mg/L all year
004Length of longest pH excursionINST MAX <= 60 min all year
004pH range excursions, monthly total accumMO MAX <= 446 min all year
005Oxygen, dissolved [DO]INST MIN >= 1 mg/L all year
005BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
005BOD, 5-day, 20 deg. CDAILY MX <= 60 mg/L all year
005pHINST MIN >= 6 SU all year
005pHINST MAX <= 9 SU all year
005Solids, total suspendedMO AVG <= 30 mg/L all year
005Solids, total suspendedDAILY MX <= 60 mg/L all year
005Flow, in conduit or thru treatment plantMO AVG report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
005Chlorine, total residualMO AVG <= .5 mg/L all year
005Chlorine, total residualDAILY MX <= 1 mg/L all year
005E. coliMO GEOMN <= 126 MPN/100mL all year
005E. coliDAILY MX <= 349 MPN/100mL all year
02CFlow, in conduit or thru treatment plantMO AVG report only all year
02CFlow, in conduit or thru treatment plantDAILY MX report only all year
02CChlorine, free availableMO AVG <= .2 mg/L all year
02CChlorine, free availableDAILY MX <= .5 mg/L all year
02DFlow, in conduit or thru treatment plantMO AVG report only all year
02DFlow, in conduit or thru treatment plantDAILY MX report only all year
02DChlorine, free availableMO AVG <= .2 mg/L all year
02DChlorine, free availableDAILY MX <= .5 mg/L all year
02EFlow, in conduit or thru treatment plantMO AVG report only all year
02EFlow, in conduit or thru treatment plantDAILY MX report only all year
02EChlorine, free availableMO AVG <= .2 mg/L all year
02EChlorine, free availableDAILY MX <= .5 mg/L all year
02FNitrite + Nitrate total [as N]MO AVG <= 3 mg/L all year
02FNitrite + Nitrate total [as N]DAILY MX <= 4 mg/L all year
02FArsenic, total [as As]MO AVG <= 8 ug/L all year
02FArsenic, total [as As]DAILY MX <= 18 ug/L all year
02FSelenium, total [as Se]MO AVG <= 29 ug/L all year
02FSelenium, total [as Se]DAILY MX <= 70 ug/L all year
02FFlow, in conduit or thru treatment plantMO AVG report only all year
02FFlow, in conduit or thru treatment plantDAILY MX report only all year
02FMercury, total [as Hg]MO AVG <= 34 ng/L all year
02FMercury, total [as Hg]DAILY MX <= 103 ng/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