MOUNT PLEASANT WATERWORKS

NPDES permit SC0040771 · Major POTW · effective, expires 2030-04-30 · 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
0required values missing, on 0 form(s)
0of 65 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 (106)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MINIMUM >= 1 mg/L all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 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 <= 926 lb/d all year
001Solids, total suspendedWKLY AVG <= 1389 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 report only 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]WKLY AVG report only 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]MO AVG report only 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]WKLY AVG report only Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
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
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 <= 1 mg/L all year
001Chlorine, total residualDAILY MX <= 1.5 mg/L all year
001Chlorine, total residualMO AVG <= 30.86 lb/d all year
001Chlorine, total residualDAILY MX <= 46.29 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
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 37.5 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 771 lb/d all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 1157 lb/d all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001Carbonaceous oxygen demand, % 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 <= 25 % all year
001% Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)DAILY MX <= 40 % all year
001IC25 Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)DAILY MN report only all year
002Oxygen, dissolved [DO]MINIMUM >= 1 mg/L all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspendedMO AVG <= 30 mg/L all year
002Solids, total suspendedWKLY AVG <= 45 mg/L all year
002Solids, total suspendedMO AVG <= 2652 lb/d all year
002Solids, total suspendedWKLY AVG <= 3978 lb/d all year
002Nitrogen, total [as N]MO AVG report only all year
002Nitrogen, total [as N]WKLY AVG report only all year
002Nitrogen, total [as N]MO AVG report only all year
002Nitrogen, total [as N]WKLY AVG report only all year
002Nitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Nov, Dec
002Nitrogen, ammonia total [as N]MO AVG report only Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
002Nitrogen, ammonia total [as N]WKLY AVG report only Jan, Feb, Nov, Dec
002Nitrogen, ammonia total [as N]WKLY AVG report only Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
002Nitrogen, ammonia total [as N]MO AVG report only Jan, Feb, Nov, Dec
002Nitrogen, ammonia total [as N]MO AVG report only Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
002Nitrogen, ammonia total [as N]WKLY AVG report only Jan, Feb, Nov, Dec
002Nitrogen, ammonia total [as N]WKLY AVG report only Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
002Phosphorus, total [as P]MO AVG report only all year
002Phosphorus, total [as P]WKLY AVG report only all year
002Phosphorus, total [as P]MO AVG report only all year
002Phosphorus, total [as P]WKLY AVG report only all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantWKLY AVG report only all year
002Chlorine, total residualMO AVG <= 1 mg/L all year
002Chlorine, total residualDAILY MX <= 1.5 mg/L all year
002Chlorine, total residualMO AVG <= 88.4 lb/d all year
002Chlorine, total residualDAILY MX <= 132.6 lb/d all year
002Enterococci30DAVGEO <= 35 MPN/100mL all year
002EnterococciDAILY MX <= 104 MPN/100mL all year
002Enterococci30DAVGEO <= 35 MPN/100mL all year
002EnterococciDAILY MX <= 800 MPN/100mL all year
002BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
002BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 37.5 mg/L all year
002BOD, carbonaceous [5 day, 20 C]MO AVG <= 2210 lb/d all year
002BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 3315 lb/d all year
002Solids, suspended percent removalMO AV MN >= 85 % all year
002Carbonaceous oxygen demand, % removalMO AV MN >= 85 % all year
002LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)DAILY MN report only all year
002% Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)MO AVG <= 25 % all year
002% Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)DAILY MX <= 40 % all year
002IC25 Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)DAILY MN report only all year
003pHMINIMUM >= 6 SU all year
003pHMAXIMUM <= 9 SU all year
003Solids, total suspendedMO AVG <= 20 mg/L all year
003Solids, total suspendedWKLY AVG <= 40 mg/L all year
003Solids, total suspendedMO AVG <= 42 lb/d all year
003Solids, total suspendedWKLY AVG <= 63 lb/d all year
003Flow, in conduit or thru treatment plantMO AVG report only all year
003Flow, in conduit or thru treatment plantWKLY AVG report only all year
004pHMINIMUM >= 6 SU all year
004pHMAXIMUM <= 9 SU all year
004Solids, total suspendedMO AVG <= 20 mg/L all year
004Solids, total suspendedWKLY AVG <= 40 mg/L all year
004Solids, total suspendedMO AVG <= 112 lb/d all year
004Solids, total suspendedWKLY AVG <= 168 lb/d all year
004Flow, in conduit or thru treatment plantMO AVG report only all year
004Flow, in conduit or thru treatment plantWKLY AVG report only all year
005Oxygen demand, ultimateMO AVG <= 11415 lb/d Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
005Oxygen demand, ultimateMO AVG <= 15111 lb/d Jan, Feb, Nov, Dec
005Oxygen demand, ultimateWKLY AVG <= 17123 lb/d Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
005Oxygen demand, ultimateWKLY AVG <= 22667 lb/d Jan, Feb, Nov, Dec

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