A wind of change blew through Quebec on June 21, 2024, with regard to the standard for manganese in drinking water. The new standard for the maximum concentration of manganese in drinking water was set at 0.12 milligrams per liter (mg/L). This measure follows growing concerns about the potential health effects of manganese, particularly in children.

Manganese is an element that occurs naturally in the environment, particularly in the soil and rocks of the Outaouais region and Quebec in general, and can dissolve into drinking water sources, mainly groundwater. Although this element is essential in small quantities for the proper functioning of the body, excessive exposure can lead to neurological risks, including behavioral and cognitive disorders in young children. It is also linked to health problems in adults, such as respiratory disorders and motor impairments at high concentrations.

The new standard therefore aims to protect public health by reducing manganese concentrations in drinking water systems. It is part of an overall effort to improve water quality and address the concerns of citizens, particularly those in regions where concentrations have historically been higher. Municipalities will now have to adapt their filtration systems to comply with this standard, thereby ensuring high-quality drinking water. For well owners, highly effective solutions are available.

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For more information, please visit the Quebec Ministry of the Environment website and Health Canada.