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Humphrey's Sand & Gravel (Big Prairie Site)

Construction Sand And Gravel, Big Prairie, Ohio. NPDES permit OH0151786, in force until Jun 30, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 20 days after each period: form A monthly (6 values)
Last report on file: August 2026

Limits in force (6)

Parameter	Statistic	Limit	Months
pH	daily minimum	≥ 6.5 SU	all year
pH	daily maximum	≤ 9 SU	all year
Solids, total suspended	monthly average	≤ 30 mg/L	all year
Solids, total suspended	daily maximum	≤ 45 mg/L	all year
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year

How strict are these limits?

Solids, total suspended, daily maximum 45 mg/L — stricter than 16% of 559 other minor industrial and other permits in Ohio; 66% have the same limit

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

Same industry: the 131 Mining and Quarrying of Nonmetallic Minerals permits in Ohio.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/OH0151786 · MCP: https://passage-data.com/mcp