Water treatment devices have been approved by the Safety and Building Division related to the water contaminants listed on this page. Select the first letter of the contaminant name to reach an alphabetical group or scroll down. Select the contaminant name to go to a lists of manufacturers and their approved products, with links to the product approval letters. If you are looking for water treatment devices approved for the disinfection of microbiologically unsafe water supplies, the select the "D" tab for "disinfection." If you are looking for a specific organic chemical, then check under the specific name of the chemical (e.g. "B" tab for benzene) and also the organic chemicals listed under the "O" tab.