PWSD No. 2 of St. Charles County

NPDES permit MO0057801 · Minor POTW · administratively continued, expires 2025-03-31 · 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.

This permit expired on 2025-03-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

0values over a limit
0required values missing, on 0 form(s)
0of 25 forms filed late

Last period with anything received: 2026-08-31.

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among MO permits in EPA's filings — check your permit).

Limits in force (44)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DAILY MN report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Oxygen, dissolved [DO]MO AV MN report only Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CWKLY AVG <= 25 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 25 mg/L all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Alkalinity, total [as CaCO3]DAILY MX report only all year
001Alkalinity, total [as CaCO3]MO AVG report only all year
001Solids, total suspendedWKLY AVG <= 25 mg/L all year
001Solids, total suspendedMO AVG <= 25 mg/L all year
001Oil and grease [soxhlet extr.] tot.DAILY MX <= 15 mg/L all year
001Oil and grease [soxhlet extr.] tot.MO AVG <= 10 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX <= 8.4 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 12.1 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 10.1 mg/L Mar, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 8.4 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 12.1 mg/L Jan, Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 10.1 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 8.4 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 8.4 mg/L Jul, Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 8.4 mg/L Oct
001Nitrogen, ammonia total [as N]MO AVG <= 1.2 mg/L Sep
001Nitrogen, ammonia total [as N]MO AVG <= 2.1 mg/L May
001Nitrogen, ammonia total [as N]MO AVG <= 2.7 mg/L Mar, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 2.1 mg/L Apr
001Nitrogen, ammonia total [as N]MO AVG <= 3.1 mg/L Jan, Feb
001Nitrogen, ammonia total [as N]MO AVG <= 1.3 mg/L Jun
001Nitrogen, ammonia total [as N]MO AVG <= 2.4 mg/L Nov
001Nitrogen, ammonia total [as N]MO AVG <= .9 mg/L Jul, Aug
001Nitrogen, ammonia total [as N]MO AVG <= 1.8 mg/L Oct
001Hardness, total [as CaCO3]DAILY MX report only all year
001Hardness, total [as CaCO3]MO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Chlorine, total residualDAILY MX <= 19 ug/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Chlorine, total residualMO AVG <= 7 ug/L Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli7 DA GEO <= 1030 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli30DA GM <= 206 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001Toxicity [acute], Ceriodaphnia dubiaDAILY MX report only all year
001Toxicity [acute], Pimephales promelas [Fathead Minnow]DAILY MX report only all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
INFBOD, 5-day, 20 deg. CMO AVG report only all year
INFSolids, total suspendedMO AVG 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