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City of Mexico

Sewage treatment plant, major discharger, Mexico, Missouri. NPDES permit MO0036242 expired Dec 31, 2021; its limits still apply. Last 12 months: over a limit 2 times (last June 2026), 4 of 47 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (26 values), outfall 001 form B quarterly (12 values), outfall INF form IN monthly (8 values), outfall SM1 form US monthly (8 values), outfall SM2 form DS monthly (2 values), outfall 001 form WC every 60 months
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 52 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
June 2026Nitrogen, ammonia total [as N], daily maximum12.9≤ 5.7 mg/L126%
June 2026Nitrogen, ammonia total [as N], monthly average3.262≤ 1.3 mg/L151%

Limits in force (62)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 7 mg/Lall year001
Oxygen, dissolved [DO]monthly average minimum≥ 7 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 35 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, Dec001
BOD, 5-day, 20 deg. Cweekly average≤ 20 mg/LJun–Sep001
BOD, 5-day, 20 deg. Cmonthly average≤ 25 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly average≤ 15 mg/LJun–Sep001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Oil and grease [soxhlet extr.] tot.daily maximumreport only (mg/L)all year001
Oil and grease [soxhlet extr.] tot.monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LApr–Sep001
Nitrogen, ammonia total [as N]daily maximum≤ 10.3 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LApr–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 2.7 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Cyanide, free [amenable to chlorination]daily maximum≤ 9.2 ug/Lall year001
Cyanide, free [amenable to chlorination]monthly average≤ 3.3 ug/Lall year001
Selenium, total recoverabledaily maximumreport only (ug/L)all year001
Selenium, total recoverablemonthly averagereport only (ug/L)all year001
Thallium, total recoverabledaily maximumreport only (ug/L)all year001
Thallium, total recoverablemonthly averagereport only (ug/L)all year001
Zinc, total recoverabledaily maximumreport only (ug/L)all year001
Zinc, total recoverablemonthly averagereport only (ug/L)all year001
Cadmium, total recoverabledaily maximumreport only (ug/L)all year001
Cadmium, total recoverablemonthly averagereport only (ug/L)all year001
Lead, total recoverabledaily maximumreport only (ug/L)all year001
Lead, total recoverablemonthly averagereport only (ug/L)all year001
Copper, total recoverabledaily maximum≤ 35.8 ug/Lall year001
Copper, total recoverablemonthly average≤ 20.8 ug/Lall year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
E. coli7-day geometric mean≤ 1030 #/100mLApr–Oct001
E. coli30-day geometric mean≤ 206 #/100mLApr–Oct001
Toxicity [chronic], Ceriodaphnia dubiadaily maximumreport only (toxic)all year001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]daily maximumreport only (toxic)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearINF
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearINF
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all yearINF
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearINF
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all yearINF
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearINF
Phosphorus, total [as P]daily maximumreport only (mg/L)all yearINF
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearINF
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearSM1
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearSM1
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all yearSM1
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearSM1
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all yearSM1
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearSM1
Phosphorus, total [as P]daily maximumreport only (mg/L)all yearSM1
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearSM1
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all yearSM2
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all yearSM2

How strict are these limits?

Cited limits by parameter: Missouri's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MO0036242 · MCP: https://passage-data.com/mcp