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General Motors LLC

Motor Vehicles And Car Bodies, Wentzville, Missouri. NPDES permit MO0100153, in force until Mar 31, 2031. Last 12 months: over a limit once (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form M monthly (16 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
December 2025Chloride [as Cl], daily maximum1080≤ 860 mg/L26%

Limits in force (16)

ParameterStatisticLimitMonths
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily maximum≤ 80 mg/Lall year
Solids, total suspendedmonthly average≤ 60 mg/Lall year
Oil and grease [soxhlet extr.] tot.daily maximum≤ 15 mg/Lall year
Oil and grease [soxhlet extr.] tot.monthly average≤ 10 mg/Lall year
Chloride [as Cl]daily maximum≤ 860 mg/Lall year
Chloride [as Cl]monthly average≤ 860 mg/Lall year
Selenium, total recoverabledaily maximumreport only (ug/L)all year
Selenium, total recoverablemonthly averagereport only (ug/L)all year
Aluminum, total recoverabledaily maximum≤ 750 ug/Lall year
Aluminum, total recoverablemonthly averagereport only (ug/L)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Chlorine, total residualdaily maximumreport only (ug/L)all year
Chlorine, total residualmonthly averagereport only (ug/L)all year

New limits from Apr 1, 2029

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chlorine, total residual, daily maximum19 ug/Lnew90 ug/L (5 values)4.74×

How strict are these limits?

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

Same industry: the 10 Transportation Equipment permits in Missouri.

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Your permit document is the final word. As JSON: /api/v1/permits/MO0100153 · MCP: https://passage-data.com/mcp