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Grand Strand Water & Sewer Authority

Sewage treatment plant, major discharger, Longs, South Carolina. NPDES permit SC0040878 expired Jul 31, 2023; its limits still apply. Last 12 months: no values over a limit, 17 required values missing, 5 of 34 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (53 values), form 1A monthly (53 values), form 2 quarterly, form 2A quarterly, form 3 quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 36 reports late

Limits in force (116)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly average≤ 222 lb/dall year
Oxygen demand, ultimatemonthly average≤ 222 lb/dall year
Oxygen demand, ultimateweekly averagereport only (lb/d)all year
Oxygen demand, ultimateweekly averagereport only (lb/d)all year
Oxygen, dissolved [DO]minimum≥ 4 mg/Lall year
Oxygen, dissolved [DO]minimum≥ 4 mg/Lall year
pHminimum≥ 6 SUall year
pHminimum≥ 6 SUall year
pHmaximum≤ 8.5 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 751 lb/dall year
Solids, total suspendedmonthly average≤ 563 lb/dall year
Solids, total suspendedweekly average≤ 1126 lb/dall year
Solids, total suspendedweekly average≤ 844.4 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]weekly averagereport only (mg/L)all year
Nitrogen, total [as N]weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]weekly averagereport only (lb/d)all year
Nitrogen, total [as N]weekly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 1.29 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 1.29 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 1.94 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 1.94 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 32.3 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 24.2 lb/dall year
Nitrogen, ammonia total [as N]weekly average≤ 48.5 lb/dall year
Nitrogen, ammonia total [as N]weekly average≤ 36.4 lb/dall year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]weekly averagereport only (mg/L)all year
Phosphorus, total [as P]weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]weekly averagereport only (lb/d)all year
Phosphorus, total [as P]weekly averagereport only (lb/d)all year
Cadmium, total [as Cd]monthly average≤ .0012 mg/Lall year
Cadmium, total [as Cd]monthly average≤ .0015 mg/Lall year
Cadmium, total [as Cd]daily maximum≤ .0066 mg/Lall year
Cadmium, total [as Cd]daily maximum≤ .0082 mg/Lall year
Cadmium, total [as Cd]monthly average≤ .03 lb/dall year
Cadmium, total [as Cd]monthly average≤ .028 lb/dall year
Cadmium, total [as Cd]daily maximum≤ .17 lb/dall year
Cadmium, total [as Cd]daily maximum≤ .15 lb/dall year
Copper, total [as Cu]monthly average≤ .025 mg/Lall year
Copper, total [as Cu]monthly average≤ .03 mg/Lall year
Copper, total [as Cu]daily maximum≤ .033 mg/Lall year
Copper, total [as Cu]daily maximum≤ .04 mg/Lall year
Copper, total [as Cu]monthly average≤ .63 lb/dall year
Copper, total [as Cu]monthly average≤ .56 lb/dall year
Copper, total [as Cu]daily maximum≤ .83 lb/dall year
Copper, total [as Cu]daily maximum≤ .75 lb/dall year
Lead, total [as Pb]monthly average≤ .0092 mg/Lall year
Lead, total [as Pb]monthly average≤ .011 mg/Lall year
Lead, total [as Pb]daily maximumreport only (mg/L)all year
Lead, total [as Pb]weekly averagereport only (mg/L)all year
Lead, total [as Pb]monthly average≤ .23 lb/dall year
Lead, total [as Pb]monthly average≤ .21 lb/dall year
Lead, total [as Pb]daily maximumreport only (lb/d)all year
Lead, total [as Pb]weekly averagereport only (lb/d)all year
Zinc, total [as Zn]monthly average≤ .4 mg/Lall year
Zinc, total [as Zn]monthly average≤ .47 mg/Lall year
Zinc, total [as Zn]daily maximum≤ .4 mg/Lall year
Zinc, total [as Zn]daily maximum≤ .47 mg/Lall year
Zinc, total [as Zn]monthly average≤ 10 lb/dall year
Zinc, total [as Zn]monthly average≤ 8.82 lb/dall year
Zinc, total [as Zn]daily maximum≤ 10 lb/dall year
Zinc, total [as Zn]daily maximum≤ 8.82 lb/dall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .042 mg/Lall year
Chlorine, total residualmonthly average≤ .034 mg/Lall year
Chlorine, total residualdaily maximum≤ .073 mg/Lall year
Chlorine, total residualdaily maximum≤ .06 mg/Lall year
Chlorine, total residualmonthly average≤ .79 lb/dall year
Chlorine, total residualmonthly average≤ .85 lb/dall year
Chlorine, total residualdaily maximum≤ 1.37 lb/dall year
Chlorine, total residualdaily maximum≤ 1.5 lb/dall year
E. coli30-day geometric mean≤ 126 MPN/100mLall year
E. coli30-day geometric mean≤ 126 MPN/100mLall year
E. colidaily maximum≤ 349 MPN/100mLall year
E. colidaily maximum≤ 349 MPN/100mLall year
E. coli30-day geometric mean≤ 126 MPN/100mLall year
E. coli30-day geometric mean≤ 126 MPN/100mLall year
E. colidaily maximum≤ 800 MPN/100mLall year
E. colidaily maximum≤ 800 MPN/100mLall year
Mercury, total [as Hg]monthly averagereport only (ng/L)all year
Mercury, total [as Hg]monthly averagereport only (ng/L)all year
Mercury, total [as Hg]daily maximumreport only (ng/L)all year
Mercury, total [as Hg]daily maximumreport only (ng/L)all year
Mercury, total [as Hg]monthly averagereport only (lb/d)all year
Mercury, total [as Hg]monthly averagereport only (lb/d)all year
Mercury, total [as Hg]daily maximumreport only (lb/d)all year
Mercury, total [as Hg]daily maximumreport only (lb/d)all year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5.61 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5.61 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 8.42 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 8.42 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 105.3 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 140.4 lb/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 158 lb/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 210.7 lb/dall year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Carbonaceous oxygen demand, % removalmonthly average minimum≥ 85 %all year
Carbonaceous oxygen demand, % removalmonthly average minimum≥ 85 %all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average≤ 25 %all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily maximum≤ 40 %all year

How strict are these limits?

Cited limits by parameter: South Carolina's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/SC0040878 · MCP: https://passage-data.com/mcp