FORT MILL TOWN OF

NPDES permit SC0020371 · Major POTW · effective, expires 2026-12-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

0values over a limit
0required values missing, on 0 form(s)
0of 27 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 (81)

OutfallParameterStatisticLimitMonths
001Oxygen demand, ultimateMO AVG <= 2237 lb/d all year
001Oxygen demand, ultimateMO AVG <= 2237 lb/d all year
001Oxygen demand, ultimateWKLY AVG <= 3356 lb/d all year
001Oxygen demand, ultimateWKLY AVG <= 3356 lb/d all year
001Oxygen, dissolved [DO]MINIMUM >= 6 mg/L all year
001Oxygen, dissolved [DO]MINIMUM >= 6 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 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. CWKLY AVG <= 45 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 1126 lb/d all year
001BOD, 5-day, 20 deg. CMO AVG <= 751 lb/d all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 1689 lb/d all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 1127 lb/d all year
001pHMINIMUM >= 6 SU all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 8.5 SU all year
001pHMAXIMUM <= 8.5 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 751 lb/d all year
001Solids, total suspendedMO AVG <= 1126 lb/d all year
001Solids, total suspendedWKLY AVG <= 1127 lb/d all year
001Solids, total suspendedWKLY AVG <= 1689 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, 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 <= 141246 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= 20 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= 20 mg/L all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 30 mg/L all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 30 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= 500 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= 751 lb/d all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 750 lb/d all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 1126 lb/d all year
001Phosphorus, total [as P]MO AVG <= 2 mg/L all year
001Phosphorus, total [as P]MO AVG <= 2 mg/L all year
001Phosphorus, total [as P]WKLY AVG <= 3 mg/L all year
001Phosphorus, total [as P]WKLY AVG <= 3 mg/L all year
001Phosphorus, total [as P]MO AVG <= 600 lb/d all year
001Phosphorus, total [as P]MO AVG <= 600 lb/d all year
001Phosphorus, total [as P]MO AVG <= 4563 lb/d all year
001Phosphorus, total [as P]MO AVG <= 4563 lb/d all year
001Flow, in conduit or thru treatment plantMO AVG 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
001Flow, in conduit or thru treatment plantWKLY AVG report only all year
001Chlorine, total residualMO AVG <= .23 mg/L all year
001Chlorine, total residualMO AVG <= .16 mg/L all year
001Chlorine, total residualDAILY MX <= .4 mg/L all year
001Chlorine, total residualDAILY MX <= .28 mg/L all year
001Chlorine, total residualMO AVG <= 5.75 lb/d all year
001Chlorine, total residualMO AVG <= 6 lb/d all year
001Chlorine, total residualDAILY MX <= 10 lb/d all year
001Chlorine, total residualDAILY MX <= 10.5 lb/d all year
001E. coli30DAVGEO <= 126 MPN/100mL all year
001E. coli30DAVGEO <= 126 MPN/100mL all year
001E. coliDAILY MX <= 349 MPN/100mL all year
001E. coliDAILY MX <= 349 MPN/100mL all year
001E. coli30DAVGEO <= 126 MPN/100mL all year
001E. coli30DAVGEO <= 126 MPN/100mL all year
001E. coliDAILY MX <= 800 MPN/100mL all year
001E. coliDAILY MX <= 800 MPN/100mL all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended 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
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 dubiaMO AVG <= 25 % all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX <= 40 % 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
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