Ameren Missouri

NPDES permit MO0137642 · Minor NON-POTW · administratively continued, expires 2024-09-30 · 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 2024-09-30 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 24 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 (18)

OutfallParameterStatisticLimitMonths
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Iron, total recoverableDAILY MX report only all year
001Iron, total recoverableMO AVG report only all year
001TetrachloroethyleneDAILY MX <= 1.6 ug/L all year
001TetrachloroethyleneMO AVG <= .8 ug/L all year
001Vinyl chlorideDAILY MX <= 4 ug/L all year
001Vinyl chlorideMO AVG <= 2 ug/L all year
001TrichloroethyleneDAILY MX <= 10.1 ug/L all year
001TrichloroethyleneMO AVG <= 5 ug/L all year
001Iron, total [as Fe]DAILY MX <= 603 ug/L all year
001Iron, total [as Fe]MO AVG <= 603 ug/L all year
001cis-1,2-DichloroethyleneDAILY MX <= 141 ug/L all year
001cis-1,2-DichloroethyleneMO AVG <= 70 ug/L all year
001Flow, process wastewaterDAILY MX report only all year
001Flow, process wastewaterMO AVG report only all year
002Iron, total recoverableDAILY MX report only all year
002Iron, total recoverableMO 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