Union Electric Company d/b/a Ameren MO

NPDES permit MO0004812 · Major NON-POTW · effective, expires 2026-11-30 · 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 81 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (91)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitDAILY MX report only all year
001Temperature, water deg. fahrenheitMO 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
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plantMO 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
001Mixing ZoneDAILY MX report only all year
001Mixing ZoneMO AVG report only all year
001Mixing ZoneDAILY MX <= 40 % all year
001Mixing ZoneMO AVG report only all year
001Month excursion time [min]MO TOTAL report only all year
001Month excursion time [min]ANNL TOT <= 528 hr all year
001Month excursion time [min]YA report only all year
004Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
004pHMINIMUM report only all year
004pHMAXIMUM report only all year
004Solids, total suspendedDAILY MX report only all year
004Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
005Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
005pHMINIMUM report only all year
005pHMAXIMUM report only all year
005Solids, total suspendedDAILY MX report only all year
005Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
010Temperature, water deg. fahrenheitDAILY MX report only all year
010Temperature, water deg. fahrenheitMO AVG report only all year
010Flow rateDAILY MX report only all year
010Flow rateMO AVG report only all year
010Solids, total suspendedDAILY MX report only all year
010Solids, total suspendedMO AVG report only all year
010Flow, in conduit or thru treatment plantDAILY MX report only all year
010Flow, in conduit or thru treatment plantMO AVG report only all year
010Flow, in conduit or thru treatment plantDAILY MX report only all year
010Flow, in conduit or thru treatment plantMO AVG report only all year
011Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
011pHMINIMUM report only all year
011pHMAXIMUM report only all year
011Solids, total suspendedDAILY MX report only all year
011Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
011Flow, in conduit or thru treatment plantDAILY MX report only all year
012Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
012pHMINIMUM report only all year
012pHMAXIMUM report only all year
012Solids, total suspendedDAILY MX report only all year
012Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
012Flow, in conduit or thru treatment plantDAILY MX report only all year
02ABOD, 5-day, 20 deg. CDAILY MX <= 45 mg/L all year
02ABOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
02ApHMINIMUM >= 6 SU all year
02ApHMAXIMUM <= 9 SU all year
02ASolids, total suspendedDAILY MX <= 45 mg/L all year
02ASolids, total suspendedMO AVG <= 30 mg/L all year
02AFlow, in conduit or thru treatment plantDAILY MX report only all year
02AFlow, in conduit or thru treatment plantMO AVG report only all year
02AE. coliDAILY MX <= 1030 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec
02AE. coli30DA GM <= 206 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec
02BOxygen demand, chem. [high level] [COD]DAILY MX report only all year
02BOxygen demand, chem. [high level] [COD]MO AVG report only all year
02BpHMINIMUM >= 6 SU all year
02BpHMAXIMUM <= 9 SU all year
02BSolids, total suspendedDAILY MX report only all year
02BSolids, total suspendedMO AVG report only all year
02BSolids, total suspendedDAILY MX <= 100 mg/L all year
02BSolids, total suspendedMO AVG <= 30 mg/L all year
02BOil and grease [soxhlet extr.] tot.DAILY MX <= 15 mg/L all year
02BOil and grease [soxhlet extr.] tot.MO AVG <= 10 mg/L all year
02BNitrogen, ammonia total [as N]DAILY MX report only all year
02BNitrogen, ammonia total [as N]MO AVG report only all year
02BNitrite + Nitrate total [as N]DAILY MX report only all year
02BNitrite + Nitrate total [as N]MO AVG report only all year
02BPhosphorus, total [as P]DAILY MX report only all year
02BPhosphorus, total [as P]MO AVG report only all year
02BSulfate, total [as SO4]DAILY MX report only all year
02BSulfate, total [as SO4]MO AVG report only all year
02BBoron, total recoverableDAILY MX report only all year
02BBoron, total recoverableMO AVG report only all year
02BChlorideDAILY MX report only all year
02BChlorideMO AVG report only all year
02BFlow, in conduit or thru treatment plantDAILY MX report only all year
02BFlow, in conduit or thru treatment plantMO AVG report only all year
02BNitrogen, Kjeldahl, total [TKN] [water]DAILY MX report only all year
02BNitrogen, Kjeldahl, total [TKN] [water]MO AVG report only all year
02BToxicity [acute], Ceriodaphnia dubiaVALUE <= 3.3 toxic all year
02BToxicity [acute], Pimephales promelas [Fathead Minnow]VALUE <= 3.3 toxic all year
02BChlorides + SulfatesDAILY MX report only all year
02BChlorides + SulfatesMO AVG report only all year
02CFreeboardMINIMUM report only all year
02CFreeboardAVERAGE 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