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Champlain Black Marble Company, LLC

Industrial or other facility, Isle La Motte, Vermont. NPDES permit VT0001121 expired Sep 30, 2024; its limits still apply. Last 12 months: no values over a limit, 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form A monthly (8 values)
Last report on file: August 2026
Oct 2024 – Sep 2025: 0 values over a limit, 18 required values missing, 8 of 12 reports late

Limits in force (10)

Parameter	Statistic	Limit	Months
Turbidity	daily maximum	≤ 10 NTU	Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
Turbidity	daily maximum	≤ 25 NTU	Jun, Jul, Sep
pH	minimum	≥ 6.5 SU	all year
pH	maximum	≤ 8.5 SU	all year
Solids, total suspended	daily maximum	≤ 10 mg/L	Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
Solids, total suspended	daily maximum	≤ 25 mg/L	Jun–Sep
Phosphorus, total [as P]	monthly average	≤ .8 mg/L	all year
Arsenic, total [as As]	daily maximum	report only (mg/L)	all year
Petrol hydrocarbons, total recoverable	daily maximum	report only (mg/L)	all year
Flow, in conduit or thru treatment plant	daily maximum	≤ .4 MGD	all year

How strict are these limits?

Turbidity, daily maximum 10 NTU — stricter than 88% of 298 other minor industrial and other permits nationwide; 8% have the same limit
Phosphorus, total [as P], monthly average .8 mg/L — stricter than 65% of 888 other minor industrial and other permits nationwide; 2% have the same limit
Solids, total suspended, daily maximum 10 mg/L — stricter than 54% of 24 other minor industrial and other permits in Vermont; 46% have the same limit

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/VT0001121 · MCP: https://passage-data.com/mcp