City of Mexico

NPDES permit MO0036242 · Major POTW · expired, expires 2021-12-31 · 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 2021-12-31 and is expired: 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
0required values missing, on 0 form(s)
4of 48 forms filed late

Last period with anything received: 2026-07-31. Most often over: Nitrogen, ammonia total [as N] (2).

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 (62)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DAILY MN >= 7 mg/L all year
001Oxygen, dissolved [DO]MO AV MN >= 7 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 35 mg/L Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
001BOD, 5-day, 20 deg. CWKLY AVG <= 20 mg/L Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. CMO AVG <= 25 mg/L Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
001BOD, 5-day, 20 deg. CMO AVG <= 15 mg/L Jun, Jul, Aug, Sep
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Oil and grease [soxhlet extr.] tot.DAILY MX report only all year
001Oil and grease [soxhlet extr.] tot.MO AVG report only all year
001Nitrogen, ammonia total [as N]DAILY MX <= 5.7 mg/L Apr, May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 10.3 mg/L Jan, Feb, Mar, Oct, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 1.3 mg/L Apr, May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG <= 2.7 mg/L Jan, Feb, Mar, Oct, Nov, Dec
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
001Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
001Nitrite + Nitrate total [as N]DAILY MX report only all year
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Cyanide, free [amenable to chlorination]DAILY MX <= 9.2 ug/L all year
001Cyanide, free [amenable to chlorination]MO AVG <= 3.3 ug/L all year
001Selenium, total recoverableDAILY MX report only all year
001Selenium, total recoverableMO AVG report only all year
001Thallium, total recoverableDAILY MX report only all year
001Thallium, total recoverableMO AVG report only all year
001Zinc, total recoverableDAILY MX report only all year
001Zinc, total recoverableMO AVG report only all year
001Cadmium, total recoverableDAILY MX report only all year
001Cadmium, total recoverableMO AVG report only all year
001Lead, total recoverableDAILY MX report only all year
001Lead, total recoverableMO AVG report only all year
001Copper, total recoverableDAILY MX <= 35.8 ug/L all year
001Copper, total recoverableMO AVG <= 20.8 ug/L 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
001E. coli7 DA GEO <= 1030 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli30DA GM <= 206 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX report only all year
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX report only all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % 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
SM1Nitrogen, ammonia total [as N]DAILY MX report only all year
SM1Nitrogen, ammonia total [as N]MO AVG report only all year
SM1Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
SM1Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
SM1Nitrite + Nitrate total [as N]DAILY MX report only all year
SM1Nitrite + Nitrate total [as N]MO AVG report only all year
SM1Phosphorus, total [as P]DAILY MX report only all year
SM1Phosphorus, total [as P]MO AVG report only all year
SM2Hardness, total [as CaCO3]DAILY MX report only all year
SM2Hardness, total [as CaCO3]MO 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