Antimony (Sb) in Drinking Water Information:

Properties:

Antimony is gray and silver in color and is classified as a metalloid. The element is used to produce a wide range of industrial materials such as flame retardants, lead alloys, batteries, solder, and metal plumbing or fittings. 

Sources:

Antimony exists in nature and may enter drinking water supplies when rocks are weathered and broken down; however, it is unlikely that enough antimony would come from a natural source to cause concern. More common sources of antimony include effluent from mining or smelting operations.1 The World Health Organization says that the most common way antimony enters drinking water is from metal plumbing and fittings dissolving. 

Regulations:

The limit of antimony in drinking water is 5 micrograms per litre (5 µg/L). 

Health/Environmental Concerns:

The exact health impacts of ingesting antimony through drinking water are unclear. However, inhalation of antimony dust can be harmful and contribute to medical problems like respiratory issues or skin conditions. 

Action:

If levels are above the allowable limit, consult your Water Services Authority to determine what further steps should be taken.1

1 Guide to the Parameters in the European Communities. What’s in your water?; S. I. No. 278 of 2007; National Federation of Group Water Schemes: Ireland.