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Grand Strand Water & Sewer Authority

Sewage treatment plant, Conway, South Carolina. NPDES permit SC0049362, in force until Mar 31, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (57 values), form 3 quarterly (4 values), form 2 yearly
Renewal application due
Oct 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 17 reports late

Limits in force (65)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly averagereport only (lb/d)all year
Oxygen demand, ultimateweekly averagereport only (lb/d)all year
Oxygen demand, ultimatemonthly averagereport only (lb/d)all year
Oxygen demand, ultimateweekly averagereport only (lb/d)all year
Oxygen demand, ultimatemonthly average= 303 lb/dall year
Oxygen demand, ultimateweekly averagereport only (lb/d)all year
Oxygen, dissolved [DO]minimum= 6 mg/Lall year
pHminimum= 6 SUall year
pHmaximum= 8.5 SUall year
Solids, total suspendedmonthly average= 30 mg/Lall year
Solids, total suspendedweekly average= 45 mg/Lall year
Solids, total suspendedmonthly average= 1000 lb/dall year
Solids, total suspendedweekly average= 1500 lb/dall 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]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]weekly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]weekly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]weekly averagereport only (lb/d)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]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]weekly averagereport only (lb/d)all year
Cadmium, total [as Cd]monthly average= .03 mg/Lall year
Cadmium, total [as Cd]daily maximum= .059 mg/Lall year
Cadmium, total [as Cd]monthly average= 1 lb/dall year
Cadmium, total [as Cd]daily maximum= 1.97 lb/dall year
Copper, total [as Cu]monthly average= .16 mg/Lall year
Copper, total [as Cu]daily maximum= .21 mg/Lall year
Copper, total [as Cu]monthly average= 5.34 lb/dall year
Copper, total [as Cu]daily maximum= 7 lb/dall year
Lead, total [as Pb]monthly average= .059 mg/Lall year
Lead, total [as Pb]daily maximumreport only (mg/L)all year
Lead, total [as Pb]monthly average= 1.97 lb/dall year
Lead, total [as Pb]daily maximumreport only (lb/d)all year
Zinc, total [as Zn]monthly average= 2.4 mg/Lall year
Zinc, total [as Zn]daily maximum= 2.4 mg/Lall year
Zinc, total [as Zn]monthly average= 80 lb/dall year
Zinc, total [as Zn]daily maximum= 80 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
Chlorine, total residualmonthly average= .29 mg/Lall year
Chlorine, total residualdaily maximum= .49 mg/Lall year
Chlorine, total residualmonthly average= 9.67 lb/dall year
Chlorine, total residualdaily maximum= 16.35 lb/dall year
E. coli30-day geometric mean= 126 MPN/100mLall year
E. colidaily maximum= 349 MPN/100mLall year
E. coli30-day geometric mean= 126 MPN/100mLall year
E. colidaily maximum= 800 MPN/100mLall year
Mercury, total [as Hg]monthly averagereport only (mg/L)all year
Mercury, total [as Hg]daily maximumreport only (mg/L)all year
Mercury, total [as Hg]monthly averagereport only (lb/d)all year
Mercury, total [as Hg]daily maximumreport only (lb/d)all year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]weekly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (lb/d)all year
BOD, carbonaceous [5 day, 20 C]weekly averagereport only (lb/d)all year
Solids, suspended percent removalmonthly average minimum= 85 %all year
Carbonaceous oxygen demand, % removalmonthly average minimum= 85 %all year
LC50 Static 48Hr Acute Ceriodaphnia dubiadaily minimumreport only (%)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
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimumreport only (%)all year

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/SC0049362 · MCP: https://passage-data.com/mcp