GRAND STRAND WATER & SEWER AUTHORITY

NPDES permit SC0037753 · Major POTW · effective, expires 2030-07-31 · 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 47 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 (86)

OutfallParameterStatisticLimitMonths
01ASolids, total suspendedMO AVG <= 30 mg/L all year
01ASolids, total suspendedWKLY AVG <= 45 mg/L all year
01ASolids, total suspendedMO AVG <= 4841 lb/d all year
01ASolids, total suspendedWKLY AVG <= 7262 lb/d all year
01ANitrogen, ammonia total [as N]MO AVG <= 15 mg/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
01ANitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Nov, Dec
01ANitrogen, ammonia total [as N]WKLY AVG <= 22.5 mg/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
01ANitrogen, ammonia total [as N]WKLY AVG report only Jan, Feb, Nov, Dec
01ANitrogen, ammonia total [as N]MO AVG <= 2421 lb/d Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
01ANitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Nov, Dec
01ANitrogen, ammonia total [as N]WKLY AVG <= 3631 lb/d Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
01ANitrogen, ammonia total [as N]WKLY AVG report only Jan, Feb, Nov, Dec
01AFlow, in conduit or thru treatment plantMO AVG report only all year
01AFlow, in conduit or thru treatment plantWKLY AVG report only all year
01ABOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L Jan, Feb, Nov, Dec
01ABOD, carbonaceous [5 day, 20 C]MO AVG <= 17.8 mg/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
01ABOD, carbonaceous [5 day, 20 C]WKLY AVG <= 37.5 mg/L Jan, Feb, Nov, Dec
01ABOD, carbonaceous [5 day, 20 C]WKLY AVG <= 26.7 mg/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
01ABOD, carbonaceous [5 day, 20 C]MO AVG <= 4034 lb/d Jan, Feb, Nov, Dec
01ABOD, carbonaceous [5 day, 20 C]MO AVG <= 2873 lb/d Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
01ABOD, carbonaceous [5 day, 20 C]WKLY AVG <= 6052 lb/d Jan, Feb, Nov, Dec
01ABOD, carbonaceous [5 day, 20 C]WKLY AVG <= 4309 lb/d Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
01ASolids, suspended percent removalMO AV MN >= 85 % all year
01ACarbonaceous oxygen demand, % removalMO AV MN >= 85 % all year
01BOxygen demand, ultimateMO AVG report only all year
01BOxygen demand, ultimateWKLY AVG report only all year
01BOxygen, dissolved [DO]MINIMUM >= 6 mg/L all year
01BpHMINIMUM >= 6 SU all year
01BpHMAXIMUM <= 8.5 SU all year
01BNitrogen, total [as N]MO AVG report only all year
01BNitrogen, total [as N]WKLY AVG report only all year
01BNitrogen, total [as N]MO AVG report only all year
01BNitrogen, total [as N]WKLY AVG report only all year
01BPhosphorus, total [as P]MO AVG report only all year
01BPhosphorus, total [as P]WKLY AVG report only all year
01BPhosphorus, total [as P]MO AVG report only all year
01BPhosphorus, total [as P]WKLY AVG report only all year
01BFlow, in conduit or thru treatment plantMO AVG report only all year
01BFlow, in conduit or thru treatment plantWKLY AVG report only all year
01COxygen demand, ultimateMO AVG report only all year
01COxygen demand, ultimateWKLY AVG report only all year
01COxygen, dissolved [DO]MINIMUM >= 6 mg/L all year
01CpHMINIMUM >= 6 SU all year
01CpHMAXIMUM <= 8.5 SU all year
01CSolids, total suspendedMO AVG <= 30 mg/L all year
01CSolids, total suspendedWKLY AVG <= 45 mg/L all year
01CSolids, total suspendedMO AVG <= 5604 lb/d all year
01CSolids, total suspendedWKLY AVG <= 8407 lb/d all year
01CNitrogen, total [as N]MO AVG report only all year
01CNitrogen, total [as N]WKLY AVG report only all year
01CNitrogen, total [as N]MO AVG report only all year
01CNitrogen, total [as N]WKLY AVG report only all year
01CNitrogen, ammonia total [as N]MO AVG <= 11 mg/L all year
01CNitrogen, ammonia total [as N]WKLY AVG <= 16.5 mg/L all year
01CNitrogen, ammonia total [as N]MO AVG <= 2055 lb/d all year
01CNitrogen, ammonia total [as N]WKLY AVG <= 3082 lb/d all year
01CPhosphorus, total [as P]MO AVG report only all year
01CPhosphorus, total [as P]WKLY AVG report only all year
01CPhosphorus, total [as P]MO AVG report only all year
01CPhosphorus, total [as P]WKLY AVG report only all year
01CFlow, in conduit or thru treatment plantMO AVG report only all year
01CFlow, in conduit or thru treatment plantWKLY AVG report only all year
01CBOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
01CBOD, carbonaceous [5 day, 20 C]WKLY AVG <= 40 mg/L all year
01CBOD, carbonaceous [5 day, 20 C]MO AVG <= 4670 lb/d all year
01CBOD, carbonaceous [5 day, 20 C]WKLY AVG <= 7473 lb/d all year
01CSolids, suspended percent removalMO AV MN >= 85 % all year
01CCarbonaceous oxygen demand, % removalMO AV MN >= 85 % all year
01DOxygen demand, ultimateMO AVG <= 5463.58 lb/d all year
01DOxygen demand, ultimateWKLY AVG report only all year
01DChlorine, total residualMO AVG <= .258 mg/L all year
01DChlorine, total residualDAILY MX <= .446 mg/L all year
01DChlorine, total residualMO AVG <= 90.53 lb/d all year
01DChlorine, total residualDAILY MX <= 156.7 lb/d all year
01DE. coli30DAVGEO <= 126 MPN/100mL all year
01DE. coliDAILY MX <= 349 MPN/100mL all year
01DE. coli30DAVGEO <= 126 MPN/100mL all year
01DE. coliDAILY MX <= 800 MPN/100mL all year
01DMercury, total [as Hg]MO AVG report only all year
01DMercury, total [as Hg]DAILY MX report only all year
01DMercury, total [as Hg]MO AVG report only all year
01DMercury, total [as Hg]DAILY MX report only all year
01DLC50 Static 48Hr Acute Ceriodaphnia dubiaDAILY MN report only all year
01D%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AVG <= 25 % all year
01D%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX <= 40 % all year
01DIC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MN 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