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General Motors LLC

Machine Tools, Metal Forming Types, major discharger, Bay City, Michigan. NPDES permit MI0001121, in force until Oct 1, 2030. Last 12 months: no values over a limit, 14 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: form A monthly (15 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 24 required values missing, 0 of 12 reports late

Limits in force (15)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Phosphorus, total [as P]monthly average≤ .5 mg/Lall year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly average≤ 25 lb/dall year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
Chloride [as Cl]daily maximumreport only (mg/L)all year
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year
Polychlorinated biphenyls [PCBs]maximum value< .2 ug/Lall year
Equipment inspection - visualvaluereport only (N=0;Y=1)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ 38 ug/Lall year
Outfall observation,visual, y/n responsevaluereport only (N=0;Y=1)all year

How strict are these limits?

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

Same industry: the 4 Industrial and Commercial Machinery and Computer Equipment permits in Michigan.

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/MI0001121 · MCP: https://passage-data.com/mcp