Union Electric Company d/b/a Ameren MO

NPDES permit MO0000043 · Major NON-POTW · administratively continued, expires 2024-02-29 · 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 2024-02-29 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)
30of 90 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 (162)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitDAILY MX report only all year
001Temperature, water deg. fahrenheitMO AVG report only all year
001Temperature, water deg. fahrenheitDAILY MX <= 63 deg F Mar
001Temperature, water deg. fahrenheitDAILY MX <= 60 deg F Dec
001Temperature, water deg. fahrenheitDAILY MX <= 92 deg F Jul, Aug
001Temperature, water deg. fahrenheitDAILY MX <= 90 deg F Jun, Sep
001Temperature, water deg. fahrenheitDAILY MX <= 53 deg F Feb
001Temperature, water deg. fahrenheitDAILY MX <= 81 deg F Oct
001Temperature, water deg. fahrenheitDAILY MX <= 83 deg F May
001Temperature, water deg. fahrenheitDAILY MX <= 53 deg F Jan
001Temperature, water deg. fahrenheitDAILY MX <= 73 deg F Apr, Nov
001Temperature, water deg. fahrenheitMO AVG report only Mar
001Temperature, water deg. fahrenheitMO AVG report only Dec
001Temperature, water deg. fahrenheitMO AVG report only Jul, Aug
001Temperature, water deg. fahrenheitMO AVG report only Jun, Sep
001Temperature, water deg. fahrenheitMO AVG report only Feb
001Temperature, water deg. fahrenheitMO AVG report only Oct
001Temperature, water deg. fahrenheitMO AVG report only May
001Temperature, water deg. fahrenheitMO AVG report only Jan
001Temperature, water deg. fahrenheitMO AVG report only Apr, Nov
001Flow rateDAILY MX report only all year
001Flow rateMO AVG report only all year
001Temp. diff. between up/down stream deg. FDAILY MX <= 5 deg F all year
001Temp. diff. between up/down stream deg. FMO 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 <= 200 ug/L all year
001Chlorine, free availableDAILY MX <= 500 ug/L all year
001Chlorine, free availableMO AVG <= 200 ug/L all year
001Toxicity [acute], Ceriodaphnia dubiaDAILY MX report only all year
001Toxicity [acute], Pimephales promelas [Fathead Minnow]DAILY MX report only all year
001Flow, process wastewaterDAILY MX report only all year
001Flow, process wastewaterMO AVG report only all year
001Month excursion time [min]ANNL TOT <= 87.6 hr all year
001Month excursion time [min]MO TOTAL report only all year
003BOD, 5-day, 20 deg. CDAILY MX <= 45 mg/L all year
003BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
003pHMINIMUM >= 6 SU all year
003pHMAXIMUM <= 9 SU all year
003Solids, total suspendedDAILY MX <= 45 mg/L all year
003Solids, total suspendedMO AVG <= 30 mg/L all year
003Nitrogen, ammonia total [as N]DAILY MX report only all year
003Nitrogen, ammonia total [as N]MO AVG report only 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. coliDAILY MX <= 630 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec
003E. coli30DA GM <= 126 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec
009Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
009Oxygen demand, chem. [high level] [COD]MO AVG report only all year
009pHMINIMUM >= 6 SU all year
009pHMAXIMUM <= 9 SU all year
009Solids, total suspendedDAILY MX <= 50 mg/L all year
009Solids, total suspendedMO AVG <= 50 mg/L all year
009Oil and grease [soxhlet extr.] tot.DAILY MX <= 15 mg/L all year
009Oil and grease [soxhlet extr.] tot.MO AVG <= 10 mg/L all year
009Nitrogen, total [as N]DAILY MX report only all year
009Nitrogen, ammonia total [as N]DAILY MX report only all year
009Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
009Nitrite + Nitrate total [as N]DAILY MX report only all year
009Phosphorus, total [as P]DAILY MX report only all year
009Sulfate, total [as SO4]DAILY MX report only all year
009Iron, total recoverableDAILY MX report only all year
009Boron, total recoverableDAILY MX report only all year
009Aluminum, total recoverableDAILY MX report only all year
009Molybdenum, total recoverableDAILY MX report only all year
009ChlorideDAILY MX report only all year
009Flow, in conduit or thru treatment plantDAILY MX report only all year
009Flow, in conduit or thru treatment plantMO AVG report only all year
009Chlorides + SulfatesDAILY MX 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 <= 150 mg/L all year
011Solids, settleableDAILY MX <= 1.5 mL/L 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 <= 150 mg/L all year
012Solids, settleableDAILY MX <= 1.5 mL/L 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
013Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
013pHMINIMUM report only all year
013pHMAXIMUM report only all year
013Solids, total suspendedDAILY MX <= 150 mg/L all year
013Solids, settleableDAILY MX <= 1.5 mL/L all year
013Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
013Flow, in conduit or thru treatment plantDAILY MX report only all year
014Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
014pHMINIMUM report only all year
014pHMAXIMUM report only all year
014Solids, total suspendedDAILY MX <= 150 mg/L all year
014Solids, settleableDAILY MX <= 1.5 mL/L all year
014Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
014Flow, in conduit or thru treatment plantDAILY MX report only all year
015Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
015pHMINIMUM report only all year
015pHMAXIMUM report only all year
015Solids, total suspendedDAILY MX <= 150 mg/L all year
015Solids, settleableDAILY MX <= 1.5 mg/L all year
015Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
015Flow, in conduit or thru treatment plantDAILY MX report only all year
016Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
016pHMINIMUM report only all year
016pHMAXIMUM report only all year
016Solids, total suspendedDAILY MX <= 150 mg/L all year
016Solids, settleableDAILY MX <= 1.5 mL/L all year
016Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
016Flow, in conduit or thru treatment plantDAILY MX report only all year
017Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
017pHMINIMUM report only all year
017pHMAXIMUM report only all year
017Solids, total suspendedDAILY MX <= 150 mg/L all year
017Solids, settleableDAILY MX <= 1.5 mL/L all year
017Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
017Flow, in conduit or thru treatment plantDAILY MX report only all year
018Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
018pHMINIMUM report only all year
018pHMAXIMUM report only all year
018Solids, total suspendedDAILY MX <= 150 mg/L all year
018Solids, settleableDAILY MX <= 1.5 mL/L all year
018Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
018Flow, in conduit or thru treatment plantDAILY MX report only all year
019Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
019pHMINIMUM report only all year
019pHMAXIMUM report only all year
019Solids, total suspendedDAILY MX <= 150 mg/L all year
019Solids, settleableDAILY MX <= 1.5 mL/L all year
019Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
019Flow, in conduit or thru treatment plantDAILY MX report only all year
01AOxygen demand, chem. [high level] [COD]DAILY MX report only all year
01AOxygen demand, chem. [high level] [COD]MO AVG report only all year
01ApHMINIMUM >= 6 SU all year
01ApHMAXIMUM <= 9 SU all year
01ASolids, total suspendedDAILY MX report only all year
01ASolids, total suspendedMO AVG report only all year
01ASolids, total suspendedDAILY MX <= 100 mg/L all year
01ASolids, total suspendedMO AVG <= 30 mg/L all year
01AOil and grease [soxhlet extr.] tot.DAILY MX <= 15 mg/L all year
01AOil and grease [soxhlet extr.] tot.MO AVG <= 10 mg/L all year
01ANitrogen, total [as N]DAILY MX report only all year
01ANitrogen, ammonia total [as N]DAILY MX report only all year
01ANitrogen, Kjeldahl, total [as N]DAILY MX report only all year
01ANitrite + Nitrate total [as N]DAILY MX report only all year
01APhosphorus, total [as P]DAILY MX report only all year
01ASulfate, total [as SO4]DAILY MX report only all year
01AIron, total recoverableDAILY MX report only all year
01ABoron, total recoverableDAILY MX report only all year
01AAluminum, total recoverableDAILY MX report only all year
01AMolybdenum, total recoverableDAILY MX report only all year
01AChlorideDAILY MX report only all year
01AFlow, in conduit or thru treatment plantDAILY MX report only all year
01AFlow, in conduit or thru treatment plantMO AVG report only all year
01AToxicity [chronic], Ceriodaphnia dubiaVALUE report only all year
01AToxicity [chronic], Pimephales promelas [Fathead Minnow]VALUE report only all year
01AChlorides + SulfatesDAILY MX report only all year
09ASolids, total suspendedDAILY MX <= 50 mg/L all year
09ASolids, total suspendedMO AVG <= 50 mg/L all year
09AFlow, in conduit or thru treatment plantDAILY MX report only all year
09AFlow, in conduit or thru treatment plantMO 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