City of Wentzville

NPDES permit MO0093599 · Major POTW · administratively continued, expires 2024-03-31 · EPA's file as of 2026-09-19

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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 2024-03-31 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

2values over a limit
2required values missing, on 1 form(s)
0of 43 forms filed late

Last period with anything received: 2026-08-31. Most often over: Copper, total recoverable (2).

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 (45)

OutfallParameterStatisticLimitMonths
003BOD, 5-day, 20 deg. CWKLY AVG <= 27 mg/L all year
003BOD, 5-day, 20 deg. CMO AVG <= 18 mg/L all year
003pHMINIMUM >= 6.5 SU all year
003pHMAXIMUM <= 9 SU all year
003Solids, total suspendedWKLY AVG <= 41 mg/L all year
003Solids, total suspendedMO AVG <= 27 mg/L all year
003Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
003Oil and grease [soxhlet extr.] tot.MO AVG report only all year
003Nitrogen, ammonia total [as N]DAILY MX <= 10 mg/L Jan, Feb, Mar, Oct, Nov, Dec
003Nitrogen, ammonia total [as N]DAILY MX <= 5.5 mg/L Apr, May, Jun, Jul, Aug, Sep
003Nitrogen, ammonia total [as N]MO AVG <= 2.5 mg/L Jan, Feb, Mar, Oct, Nov, Dec
003Nitrogen, ammonia total [as N]MO AVG <= 1.1 mg/L Apr, May, Jun, Jul, Aug, Sep
003Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
003Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
003Nitrite + Nitrate total [as N]DAILY MX report only all year
003Nitrite + Nitrate total [as N]MO AVG report only all year
003Phosphorus, total [as P]DAILY MX report only all year
003Phosphorus, total [as P]MO AVG report only all year
003Arsenic, total recoverableDAILY MX report only all year
003Arsenic, total recoverableMO AVG report only all year
003Selenium, total recoverableDAILY MX <= 6.2 ug/L all year
003Selenium, total recoverableMO AVG <= 3.1 ug/L all year
003Copper, total recoverableDAILY MX <= 24.4 ug/L all year
003Copper, total recoverableMO AVG <= 12.2 ug/L all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Flow, in conduit or thru treatment plantMO AVG report only all year
003E. coli7 DA GEO <= 1030 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
003E. coli30DA GM <= 206 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
003Toxicity [chronic], Ceriodaphnia dubiaDAILY MX report only all year
003Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX report only all year
003BOD, 5-day, percent removalMO AV MN >= 85 % all year
003Solids, 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
INFNitrogen, ammonia total [as N]DAILY MX report only all year
INFNitrogen, ammonia total [as N]MO AVG report only all year
INFNitrogen, Kjeldahl, total [as N]DAILY MX report only all year
INFNitrogen, Kjeldahl, total [as N]MO AVG report only all year
INFNitrite + Nitrate total [as N]DAILY MX report only all year
INFNitrite + Nitrate total [as N]MO AVG report only all year
INFPhosphorus, total [as P]DAILY MX report only all year
INFPhosphorus, total [as P]MO AVG report only all year
SM2Temperature, water deg. centigradeMO AVG report only all year
SM2pHDAILY MX report only all year
SM2Hardness, total [as CaCO3]DAILY MX 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