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Grand Strand Water & Sewer Authority

Sewage treatment plant, major discharger, Conway, South Carolina. NPDES permit SC0021733, in force until Mar 31, 2028. Last 12 months: over a limit once (last February 2026), 28 required values missing, 8 of 15 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form 1 monthly (37 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

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
February 2026Oxygen demand, ultimate, monthly average359≤ 303 lb/d18%

Limits in force (45)

ParameterStatisticLimitMonths
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≤ 1001 lb/dall year
Solids, total suspendedweekly average≤ 1502 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 average≤ 1.83 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 2.75 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 61 lb/dall year
Nitrogen, ammonia total [as N]weekly average≤ 92 lb/dall 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
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≤ .011 mg/Lall year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Chlorine, total residualmonthly average≤ .37 lb/dall year
Chlorine, total residualdaily maximum≤ .63 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 average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 334 lb/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 501 lb/dall year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Carbonaceous oxygen demand, % removalmonthly average minimum≥ 85 %all year
LC50 Static Renewal 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

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/SC0021733 · MCP: https://passage-data.com/mcp