Union Electric Company d/b/a Ameren MO

NPDES permit MO0098001 · Major NON-POTW · administratively continued, expires 2025-06-30 · 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.

This permit expired on 2025-06-30 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 85 forms filed late

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

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 (127)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitDAILY MX report only all year
001Temperature, water deg. fahrenheitMO AVG report only all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedDAILY MX <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 30 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
001Boron, total recoverableDAILY MX <= 8000 mg/L all year
001Boron, total recoverableMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plantVALUE report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualDAILY MX <= 200 ug/L all year
001Chlorine, total residualMO AVG <= 104 ug/L all year
002Temperature, water deg. fahrenheitDAILY MX report only all year
002Temperature, water deg. fahrenheitMO AVG report only all year
002pHMINIMUM report only all year
002pHMAXIMUM report only all year
002Solids, total suspendedDAILY MX report only all year
002Solids, total suspendedMO AVG report only all year
002Oil and grease [soxhlet extr.] tot.DAILY MX <= 15 mg/L all year
002Oil and grease [soxhlet extr.] tot.MO AVG <= 10 mg/L all year
002Nitrogen, ammonia total [as N]DAILY MX report only all year
002Nitrogen, ammonia total [as N]MO AVG report only all year
002Nitrite + Nitrate total [as N]DAILY MX report only all year
002Nitrite + Nitrate total [as N]MO AVG report only all year
002Phosphorus, total [as P]DAILY MX report only all year
002Phosphorus, total [as P]MO AVG report only all year
002BiocidesDAILY MX <= 50 ug/L all year
002BiocidesMO AVG <= 50 ug/L all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Chlorine, total residualDAILY MX <= 200 ug/L all year
002Chlorine, total residualMO AVG <= 104 ug/L all year
002Nitrogen, Kjeldahl, total [TKN] [water]DAILY MX report only all year
002Nitrogen, Kjeldahl, total [TKN] [water]MO AVG report only all year
002Toxicity [acute], Ceriodaphnia dubiaVALUE report only all year
002Toxicity [acute], Pimephales promelas [Fathead Minnow]VALUE report only all year
002Solids, total dissolvedDAILY MX <= 5500 mg/L all year
002Solids, total dissolvedMO AVG report only all year
002Day - max excursion time [min]INST MAX <= 60 min all year
002Day - max excursion time [min]VALUE <= 446 min all year
002Day - max excursion time [min]DAILY MX <= 120 min all year
002Day - max excursion time [min]MO AVG report only all year
003Toxicity [chronic], Ceriodaphnia dubiaVALUE <= 1.6 toxic all year
003Toxicity [chronic], Pimephales promelas [Fathead Minnow]VALUE <= 1.6 toxic all year
007Toxicity [chronic], Ceriodaphnia dubiaVALUE <= 1.6 toxic all year
007Toxicity [chronic], Pimephales promelas [Fathead Minnow]VALUE <= 1.6 toxic all year
009FlowDAILY MX report only all year
009FlowMO AVG report only all year
010Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
010Oxygen demand, chem. [high level] [COD]QRTR AVG report only all year
010pHMINIMUM report only all year
010pHMAXIMUM report only all year
010Solids, total suspendedDAILY MX report only all year
010Solids, total suspendedQRTR AVG report only all year
010Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
010Oil and grease [soxhlet extr.] tot.QRTR AVG report only all year
010FlowDAILY MX report only all year
010FlowQRTR AVG report only all year
011Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
011Oxygen demand, chem. [high level] [COD]QRTR AVG report only all year
011pHMINIMUM report only all year
011pHMAXIMUM report only all year
011Solids, total suspendedDAILY MX report only all year
011Solids, total suspendedQRTR AVG report only all year
011Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
011Oil and grease [soxhlet extr.] tot.QRTR AVG report only all year
011FlowDAILY MX report only all year
011FlowQRTR AVG report only all year
012Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
012Oxygen demand, chem. [high level] [COD]QRTR AVG report only all year
012pHMINIMUM report only all year
012pHMAXIMUM report only all year
012Solids, total suspendedDAILY MX report only all year
012Solids, total suspendedQRTR AVG report only all year
012Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
012Oil and grease [soxhlet extr.] tot.QRTR AVG report only all year
012FlowDAILY MX report only all year
012FlowQRTR AVG report only all year
014Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
014Oxygen demand, chem. [high level] [COD]QRTR AVG report only all year
014pHMINIMUM report only all year
014pHMAXIMUM report only all year
014Solids, total suspendedDAILY MX report only all year
014Solids, total suspendedQRTR AVG report only all year
014Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
014Oil and grease [soxhlet extr.] tot.QRTR AVG report only all year
014FlowDAILY MX report only all year
014FlowQRTR AVG report only all year
015Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
015Oxygen demand, chem. [high level] [COD]QRTR AVG report only all year
015pHMINIMUM report only all year
015pHMAXIMUM report only all year
015Solids, total suspendedDAILY MX report only all year
015Solids, total suspendedQRTR AVG report only all year
015Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
015Oil and grease [soxhlet extr.] tot.QRTR AVG report only all year
015FlowDAILY MX report only all year
015FlowQRTR AVG report only all year
016Temperature, water deg. fahrenheitDAILY MX report only all year
016Temperature, water deg. fahrenheitMO AVG report only all year
016pHMINIMUM >= 6 SU all year
016pHMAXIMUM <= 9 SU all year
016Solids, total suspendedDAILY MX <= 100 mg/L all year
016Solids, total suspendedMO AVG <= 30 mg/L all year
016Oil and grease [soxhlet extr.] tot.DAILY MX <= 15 mg/L all year
016Oil and grease [soxhlet extr.] tot.MO AVG <= 10 mg/L all year
016Nitrogen, ammonia total [as N]DAILY MX report only all year
016Nitrogen, ammonia total [as N]MO AVG report only all year
016Nitrite + Nitrate total [as N]DAILY MX report only all year
016Nitrite + Nitrate total [as N]MO AVG report only all year
016Phosphorus, total [as P]DAILY MX report only all year
016Phosphorus, total [as P]MO AVG report only all year
016Flow, in conduit or thru treatment plantDAILY MX report only all year
016Flow, in conduit or thru treatment plantMO AVG report only all year
016Flow, in conduit or thru treatment plantDAILY MX report only all year
016Flow, in conduit or thru treatment plantMO AVG report only all year
016Chlorine, total residualDAILY MX <= 200 ug/L all year
016Chlorine, total residualMO AVG <= 104 ug/L all year
016Nitrogen, Kjeldahl, total [TKN] [water]DAILY MX report only all year
016Nitrogen, Kjeldahl, total [TKN] [water]MO AVG report only all year
016Toxicity [acute], Ceriodaphnia dubiaVALUE report only all year
016Toxicity [acute], Pimephales promelas [Fathead Minnow]VALUE report only all year
100FlowDAILY MX report only all year
100FlowMO 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