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General Motors LLC

Aluminum Foundries, Defiance, Ohio. NPDES permit OH0132527, in force until Oct 31, 2027. Last 12 months: over a limit once (last November 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (14 values)
Renewal application due
May 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimit
November 2025pH, daily maximum10.8≤ 9 SU

Limits in force (16)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6.5 SUJan, Mar, May, Jul, Sep, Nov
pHdaily maximum≤ 9 SUJan, Mar, May, Jul, Sep, Nov
Solids, total suspendedmonthly average≤ 10 mg/LJan, Mar, May, Jul, Sep, Nov
Solids, total suspendeddaily maximum≤ 12 mg/LJan, Mar, May, Jul, Sep, Nov
Solids, total suspendedmonthly average≤ 3.8 kg/dJan, Mar, May, Jul, Sep, Nov
Solids, total suspendeddaily maximum≤ 4.6 kg/dJan, Mar, May, Jul, Sep, Nov
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Mar, May, Jul, Sep, Nov
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Mar, May, Jul, Sep, Nov
Phenolmonthly averagereport only (ug/L)Jun, Dec
Phenoldaily maximumreport only (ug/L)Jun, Dec
Polychlorinated biphenyls [PCBs]monthly averagereport only (ug/L)Jan, Mar, May, Jul, Sep, Nov
Polychlorinated biphenyls [PCBs]daily maximumreport only (ug/L)Jan, Mar, May, Jul, Sep, Nov
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Mercury, total low levelmonthly averagereport only (ng/L)Jan, Mar, May, Jul, Sep, Nov
Mercury, total low leveldaily maximumreport only (ng/L)Jan, Mar, May, Jul, Sep, Nov

How strict are these limits?

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

Same industry: the 56 Primary Metal Industries permits in Ohio.

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/OH0132527 · MCP: https://passage-data.com/mcp