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Isle of Palms Water & Sewer Commission

Sewage treatment plant, Isle Of Palms, South Carolina. NPDES permit SC0025283, in force until Nov 30, 2026. Last 12 months: no values over a limit, 44 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1A monthly (43 values), form 3 monthly (8 values), form 4A monthly (1 value), form 4 quarterly
Renewal application due
Jun 3, 2026 · 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 28 reports late

Limits in force (64)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 1 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 75 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 113 lb/dall year
pHminimum≥ 6.5 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≤ 75 lb/dall year
Solids, total suspendedweekly average≤ 113 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)Jan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 20 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly geometric meanreport only (mg/L)Jan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 30 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly averagereport only (mg/L)Jan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)Jan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 50 lb/dMar–Oct
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)Jan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly averagereport only (lb/d)Jan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 75 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly averagereport only (lb/d)Jan, Feb, Nov, Dec
Cadmium, total [as Cd]monthly averagereport only (mg/L)all year
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year
Cadmium, total [as Cd]monthly averagereport only (lb/d)all year
Cadmium, total [as Cd]daily maximumreport only (lb/d)all year
Copper, total [as Cu]monthly averagereport only (mg/L)all year
Copper, total [as Cu]daily maximumreport only (mg/L)all year
Copper, total [as Cu]monthly averagereport only (lb/d)all year
Copper, total [as Cu]daily maximumreport only (lb/d)all year
Lead, total [as Pb]monthly averagereport only (mg/L)all year
Lead, total [as Pb]daily maximumreport only (mg/L)all year
Lead, total [as Pb]monthly averagereport only (lb/d)all year
Lead, total [as Pb]daily maximumreport only (lb/d)all year
Zinc, total [as Zn]monthly averagereport only (mg/L)all year
Zinc, total [as Zn]daily maximumreport only (mg/L)all year
Zinc, total [as Zn]monthly averagereport only (lb/d)all year
Zinc, total [as Zn]daily maximumreport 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≤ .071 mg/Lall year
Chlorine, total residualdaily maximum≤ .122 mg/Lall year
Chlorine, total residualmonthly average≤ .18 lb/dall year
Chlorine, total residualdaily maximum≤ .31 lb/dall year
Enterococci30-day geometric mean≤ 35 MPN/100mLall year
Enterococcidaily maximum≤ 104 MPN/100mLall year
Enterococci30-day geometric mean≤ 35 MPN/100mLall year
Enterococcidaily maximum≤ 800 MPN/100mLall year
Coliform, fecal general30-day geometric mean≤ 14 MPN/100mLall year
Coliform, fecal generaldaily maximum≤ 43 MPN/100mLall year
Coliform, fecal general30-day geometric mean≤ 14 MPN/100mLall year
Coliform, fecal generaldaily maximum≤ 200 MPN/100mLall year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)daily minimumreport only (%)all year
% Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly averagereport only (%)all year
% Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)daily maximumreport only (%)all year
Pass/Fail Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)daily maximumreport only (pass=0;fail=1)all year
IC25 Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)daily minimumreport only (%)all year

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/SC0025283 · MCP: https://passage-data.com/mcp