ISLE OF PALMS WATER & SEWER COMMISSION

NPDES permit SC0025283 · Minor POTW · effective, expires 2026-11-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
44required values missing, on 2 form(s)
0of 39 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 29 days after each monitoring period ends (the most common figure among SC permits in EPA's filings — check your permit).

Limits in force (64)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MINIMUM >= 1 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 75 lb/d all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 113 lb/d all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 8.5 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 75 lb/d all year
001Solids, total suspendedWKLY AVG <= 113 lb/d all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]WKLY AVG report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]WKLY AVG report only all year
001Nitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 20 mg/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Nov, Dec
001Nitrogen, ammonia total [as N]WK GEOMN report only Jan, Feb, Nov, Dec
001Nitrogen, ammonia total [as N]WKLY AVG <= 30 mg/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG report only Jan, Feb, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 50 lb/d Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Nov, Dec
001Nitrogen, ammonia total [as N]WKLY AVG report only Jan, Feb, Nov, Dec
001Nitrogen, ammonia total [as N]WKLY AVG <= 75 lb/d Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG report only Jan, Feb, Nov, Dec
001Cadmium, total [as Cd]MO AVG report only all year
001Cadmium, total [as Cd]DAILY MX report only all year
001Cadmium, total [as Cd]MO AVG report only all year
001Cadmium, total [as Cd]DAILY MX report only all year
001Copper, total [as Cu]MO AVG report only all year
001Copper, total [as Cu]DAILY MX report only all year
001Copper, total [as Cu]MO AVG report only all year
001Copper, total [as Cu]DAILY MX report only all year
001Lead, total [as Pb]MO AVG report only all year
001Lead, total [as Pb]DAILY MX report only all year
001Lead, total [as Pb]MO AVG report only all year
001Lead, total [as Pb]DAILY MX report only all year
001Zinc, total [as Zn]MO AVG report only all year
001Zinc, total [as Zn]DAILY MX report only all year
001Zinc, total [as Zn]MO AVG report only all year
001Zinc, total [as Zn]DAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantWKLY AVG report only all year
001Chlorine, total residualMO AVG <= .071 mg/L all year
001Chlorine, total residualDAILY MX <= .122 mg/L all year
001Chlorine, total residualMO AVG <= .18 lb/d all year
001Chlorine, total residualDAILY MX <= .31 lb/d all year
001Enterococci30DAVGEO <= 35 MPN/100mL all year
001EnterococciDAILY MX <= 104 MPN/100mL all year
001Enterococci30DAVGEO <= 35 MPN/100mL all year
001EnterococciDAILY MX <= 800 MPN/100mL all year
001Coliform, fecal general30DAVGEO <= 14 MPN/100mL all year
001Coliform, fecal generalDAILY MX <= 43 MPN/100mL all year
001Coliform, fecal general30DAVGEO <= 14 MPN/100mL all year
001Coliform, fecal generalDAILY MX <= 200 MPN/100mL all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)DAILY MN report only all year
001% Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)MO AVG report only all year
001% Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)DAILY MX report only all year
001Pass/Fail Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)DAILY MX report only all year
001IC25 Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)DAILY 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