Freshwater quality monitoring

Environmental monitoring, Assessment and reporting on aquatic ecosystems status and trends.

Services and information

Atlantic watershed

Great Lakes, St. Lawrence, St. Croix, Churchill and Saint John rivers.

Hudson Bay watershed

Nelson, Saskatchewan and Churchill rivers, Lake Winnipeg, Lake Manitoba, Lake of the Woods.

Pacific Ocean watershed

Fraser, Yukon, Columbia and Quinsam rivers, Georgia Basin.

Arctic and Athabasca watershed

Mackenzie, Peace, Athabasca, and Liard rivers, Slave, Athabasca and Great Bear lakes.


Excessive contributions of phosphorus and nitrogen can cause eutrophic conditions in aquatic ecosystems.


Aquatic ecosystems in agricultural regions are vulnerable to contamination by pesticides.

Metals and other toxic subtances

Polychlorinated Biphenyls (PCBs), polycyclic aromatic hydrocabons (PAHs), and metals, including mercury, are found in water and sediment.

Substances of emerging concern

Chemical and pharmaceutical products are monitored.

Partners and agreements

Preserving the health of Canadian waters is a shared responsibility.

Online data

Water quality data, interactive mapping.


Overview of the role of the fresh water quality monitoring and surveillance division.

What we are doing

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