Wood preservation facilities, chromated copper arsenate: chapter B, table 3

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Element	Limit value (mg/L)	Basis (objectives)	Agency
Arsenic	Maximum: 0.05 mg/L	Protection of human health	International Joint Commission^Footnotea
	Maximum: 0.01 mg/L	Protection of human health Objective: < 0.005 mg/L	Health Canada ^Footnoteb^Footnotec
	Fresh water: 0.005 mg/L Marine: 0.0125 mg/L	Protection of aquatic life	Canadian Council of Ministers of the Environment (CCME) ^Footnoted
Chromium	Maximum: 0.05 mg/L	Protection of human health	International Joint Commission ^Footnotea
	Maximum: 0.05 mg/L (under review)	Protection of human health Objective: < 0.0002 mg/L	Health Canada ^Footnoteb^Footnotec
	Fresh water: 0.001 mg/L Marine: 0.0015 mg/L	Protection of aquatic life	CCME^Footnoted
Copper	Maximum: 0.005 mg/L	Protection of aquatic life	International Joint Commission ^Footnotea
		Protection of human health Aesthetic objectives: < 1.0 mg/L	Health Canada ^Footnoteb^Footnotec
	Varies with hardness 0.002 mg/L (hardness = 0-60 mg/L CaCO₃) 0.003 mg/L (hardness = 60-120 mg/L CaCO₃) 0.004 mg/L (hardness =120-180 mg/L CaCO₃) 0.006 mg/L (hardness > 180 mg/L CaCO₃)	Protection of aquatic life	CCME^Footnoted

Footnotes

Footnote a

Recommendations of the International Joint Commission (IJC) to the governments of Canada and the United States, Great Lakes Water Quality Agreement, 1978 (Review 2007).

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Footnote b

Health Canada, Guidelines for Canadian Drinking Water Quality, 2010

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Footnote c

“Maximum acceptable” was defined by Health and Welfare Canada as: “Drinking water that contains substances in concentrations greater than these limits is either capable of producing deleterious health effects or is aesthetically objectionable.” “Objective” is defined by Health and Welfare Canada as: “This level is interpreted as the ultimate quality goal for both health and aesthetic purposes.”

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Footnote d

Canadian Council of Ministers of the Environment (CCME) Canadian Environmental Quality Guidelines, Water Quality Guidelines for the Protection of Aquatic Life.

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Date modified:: 2017-09-10

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Wood preservation facilities, chromated copper arsenate: chapter B, table 3

Table 3. Regulatory Limits for Arsenic, Chromium and Copper in Natural Water Bodies

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