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Manthei Incorporated

Hardwood Veneer And Plywood, Petoskey, Michigan. NPDES permit MI0046957, in force until Oct 1, 2029. Last 12 months: over a limit 2 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due: About 21 days after each period: form A monthly (9 values)
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 ending	Parameter	Reported	Limit	Over by
July 2026	Phosphorus, total [as P], monthly average	.84	≤ .5 mg/L	68%
August 2026	Phosphorus, total [as P], monthly average	.8125	≤ .5 mg/L	63%

Limits in force (9)

Parameter	Statistic	Limit	Months
pH	daily minimum	≥ 6.5 SU	all year
pH	daily maximum	≤ 9 SU	all year
Phosphorus, total [as P]	monthly average	≤ .5 mg/L	all year
Phosphorus, total [as P]	daily maximum	report only (mg/L)	all year
Phosphorus, total [as P]	monthly average	report only (lb/d)	all year
Phosphorus, total [as P]	daily maximum	report only (lb/d)	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
Outfall observation,visual, y/n response	value	report only (N=0;Y=1)	all year

How strict are these limits?

Phosphorus, total [as P], monthly average .5 mg/L — stricter than 60% of 96 other minor industrial and other permits in Michigan; 22% have the same limit

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

Same industry: the 3 Lumber and Wood Products 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/MI0046957 · MCP: https://passage-data.com/mcp