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Gerken Materials, Inc., West Millgrove Quarry

Crushed And Broken Limestone, West Millgrove, Ohio. NPDES permit OH0125547, in force until Mar 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (10 values), outfall 901 form A monthly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 2 of 14 reports late

Limits in force (12)

ParameterStatisticLimitMonthsOutfall
pHdaily minimum≥ 6.5 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendeddaily maximum≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 181.7 kg/dall year001
Solids, total suspendeddaily maximum≤ 272.5 kg/dall year001
Copper, total recoverablemonthly averagereport only (ug/L)all year001
Copper, total recoverabledaily maximumreport only (ug/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Hardness, total [as CaCO3]monthly averagereport only (mg/L)Mar, Jun, Sep, Dec901
Hardness, total [as CaCO3]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec901

How strict are these limits?

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

Same industry: the 131 Mining and Quarrying of Nonmetallic Minerals 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/OH0125547 · MCP: https://passage-data.com/mcp