What is Manganese?

Manganese is a mineral found naturally in rocks, soil, groundwater, and surface water. In small amounts, it is essential for good health and is a necessary part of our diet.

How are People Exposed to Manganese?

Most people get exposed to manganese through food or drinking water.  A normal diet usually provides enough manganese for good health. However, some areas in the NWT have naturally higher levels of manganese in the water, especially during certain seasons.

Can Manganese Affect My Health?

Manganese is vital for digestion, bone strength, and immune system function. However, too little or too much manganese can be harmful. High levels of manganese in drinking water can lead to excessive intake, posing health risks.

How Much Manganese is Too Much?

Health Canada has set a maximum acceptable concentration (MAC) of 0.12 mg/L in drinking water. Short-term exposure to levels slightly above the guideline is unlikely to harm adults and older children health effects. However, long-term exposure to high levels can cause:

• Neurological and behavioural issues.
• Memory, attention, and motor skill deficits.

Is Manganese a Concern for Infants and Children?

Yes, especially for formula-fed infants.  Infant formulas contain manganese, and if prepared with water high in manganese, infants may receive excessive amounts.  Infants and young children absorb more manganese but get rid of less of it, increasing their risk.  Since manganese effects the developing nervous system, it is important for pregnant women, infants and young children to drink water with manganese levels below the Maximum Allowable Concentration set by the Guidelines for Canadian Drinking Water Quality. 

How Can Infants, Children, and Pregnant Women Be Protected?

Prepare baby formula with bottled water or water low in manganese.  Children under five should also drink bottled water or water with low manganese levels.