GRAND STRAND WATER & SEWER AUTHORITY

NPDES permit SC0040878 · Major POTW · administratively continued, expires 2023-07-31 · 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 2023-07-31 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
17required values missing, on 5 form(s)
5of 34 forms filed late

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

Reporting

Reports are due about 29 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (116)

OutfallParameterStatisticLimitMonths
001Oxygen demand, ultimateMO AVG <= 222 lb/d all year
001Oxygen demand, ultimateMO AVG <= 222 lb/d all year
001Oxygen demand, ultimateWKLY AVG report only all year
001Oxygen demand, ultimateWKLY AVG report only all year
001Oxygen, dissolved [DO]MINIMUM >= 4 mg/L all year
001Oxygen, dissolved [DO]MINIMUM >= 4 mg/L all year
001pHMINIMUM >= 6 SU all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 8.5 SU all year
001pHMAXIMUM <= 8.5 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 751 lb/d all year
001Solids, total suspendedMO AVG <= 563 lb/d all year
001Solids, total suspendedWKLY AVG <= 1126 lb/d all year
001Solids, total suspendedWKLY AVG <= 844.4 lb/d all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]WKLY AVG report only all year
001Nitrogen, total [as N]WKLY AVG report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]WKLY AVG report only all year
001Nitrogen, total [as N]WKLY AVG report only all year
001Nitrogen, ammonia total [as N]MO AVG <= 1.29 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= 1.29 mg/L all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 1.94 mg/L all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 1.94 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= 32.3 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= 24.2 lb/d all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 48.5 lb/d all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 36.4 lb/d all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]WKLY AVG report only all year
001Phosphorus, total [as P]WKLY AVG report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]WKLY AVG report only all year
001Phosphorus, total [as P]WKLY AVG report only all year
001Cadmium, total [as Cd]MO AVG <= .0012 mg/L all year
001Cadmium, total [as Cd]MO AVG <= .0015 mg/L all year
001Cadmium, total [as Cd]DAILY MX <= .0066 mg/L all year
001Cadmium, total [as Cd]DAILY MX <= .0082 mg/L all year
001Cadmium, total [as Cd]MO AVG <= .03 lb/d all year
001Cadmium, total [as Cd]MO AVG <= .028 lb/d all year
001Cadmium, total [as Cd]DAILY MX <= .17 lb/d all year
001Cadmium, total [as Cd]DAILY MX <= .15 lb/d all year
001Copper, total [as Cu]MO AVG <= .025 mg/L all year
001Copper, total [as Cu]MO AVG <= .03 mg/L all year
001Copper, total [as Cu]DAILY MX <= .033 mg/L all year
001Copper, total [as Cu]DAILY MX <= .04 mg/L all year
001Copper, total [as Cu]MO AVG <= .63 lb/d all year
001Copper, total [as Cu]MO AVG <= .56 lb/d all year
001Copper, total [as Cu]DAILY MX <= .83 lb/d all year
001Copper, total [as Cu]DAILY MX <= .75 lb/d all year
001Lead, total [as Pb]MO AVG <= .0092 mg/L all year
001Lead, total [as Pb]MO AVG <= .011 mg/L all year
001Lead, total [as Pb]DAILY MX report only all year
001Lead, total [as Pb]WKLY AVG report only all year
001Lead, total [as Pb]MO AVG <= .23 lb/d all year
001Lead, total [as Pb]MO AVG <= .21 lb/d all year
001Lead, total [as Pb]DAILY MX report only all year
001Lead, total [as Pb]WKLY AVG report only all year
001Zinc, total [as Zn]MO AVG <= .4 mg/L all year
001Zinc, total [as Zn]MO AVG <= .47 mg/L all year
001Zinc, total [as Zn]DAILY MX <= .4 mg/L all year
001Zinc, total [as Zn]DAILY MX <= .47 mg/L all year
001Zinc, total [as Zn]MO AVG <= 10 lb/d all year
001Zinc, total [as Zn]MO AVG <= 8.82 lb/d all year
001Zinc, total [as Zn]DAILY MX <= 10 lb/d all year
001Zinc, total [as Zn]DAILY MX <= 8.82 lb/d all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantWKLY AVG report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantWKLY AVG report only all year
001Chlorine, total residualMO AVG <= .042 mg/L all year
001Chlorine, total residualMO AVG <= .034 mg/L all year
001Chlorine, total residualDAILY MX <= .073 mg/L all year
001Chlorine, total residualDAILY MX <= .06 mg/L all year
001Chlorine, total residualMO AVG <= .79 lb/d all year
001Chlorine, total residualMO AVG <= .85 lb/d all year
001Chlorine, total residualDAILY MX <= 1.37 lb/d all year
001Chlorine, total residualDAILY MX <= 1.5 lb/d all year
001E. coli30DAVGEO <= 126 MPN/100mL all year
001E. coli30DAVGEO <= 126 MPN/100mL all year
001E. coliDAILY MX <= 349 MPN/100mL all year
001E. coliDAILY MX <= 349 MPN/100mL all year
001E. coli30DAVGEO <= 126 MPN/100mL all year
001E. coli30DAVGEO <= 126 MPN/100mL all year
001E. coliDAILY MX <= 800 MPN/100mL all year
001E. coliDAILY MX <= 800 MPN/100mL all year
001Mercury, total [as Hg]MO AVG report only all year
001Mercury, total [as Hg]MO AVG report only all year
001Mercury, total [as Hg]DAILY MX report only all year
001Mercury, total [as Hg]DAILY MX report only all year
001Mercury, total [as Hg]MO AVG report only all year
001Mercury, total [as Hg]MO AVG report only all year
001Mercury, total [as Hg]DAILY MX report only all year
001Mercury, total [as Hg]DAILY MX report only all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 5.61 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 5.61 mg/L all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 8.42 mg/L all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 8.42 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 105.3 lb/d all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 140.4 lb/d all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 158 lb/d all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 210.7 lb/d all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001Carbonaceous oxygen demand, % removalMO AV MN >= 85 % all year
001Carbonaceous oxygen demand, % removalMO AV MN >= 85 % 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

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