SOUTH ISLAND PUBLIC SERVICE DISTRICT

NPDES permit SC0042501 · Major POTW · effective, expires 2029-01-31 · 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
0required values missing, on 0 form(s)
0of 12 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 (45)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MINIMUM >= 5 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 8.9 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 13.4 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 371 lb/d all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 557 lb/d all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 8.5 SU all year
001Solids, total suspendedMO AVG <= 8.9 mg/L all year
001Solids, total suspendedWKLY AVG <= 13.4 mg/L all year
001Solids, total suspendedMO AVG <= 371 lb/d all year
001Solids, total suspendedWKLY AVG <= 557 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 <= 3.3 mg/L all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 5 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= 138 lb/d all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 207 lb/d all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]WKLY AVG report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]WKLY AVG report only all year
001Hardness, total [as CaCO3]MO AVG report only all year
001Hardness, total [as CaCO3]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 <= .008 mg/L all year
001Chlorine, total residualDAILY MX <= .013 mg/L all year
001Chlorine, total residualMO AVG <= .33 lb/d all year
001Chlorine, total residualDAILY MX <= .54 lb/d all year
001EnterococciMO AVG <= 35 MPN/100mL all year
001EnterococciDAILY MX <= 104 MPN/100mL all year
001EnterococciMO AVG <= 35 MPN/100mL all year
001EnterococciDAILY MX <= 800 MPN/100mL all year
001Coliform, fecal generalMO AVG <= 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 Ceriodaphnia dubiaDAILY MN report only all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AVG <= 25 % all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX <= 40 % all year
001IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY 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