California Code, Health and Safety Code - HSC § 116835

(a) A water treatment device for which a health or safety claim is made shall not be sold or otherwise distributed unless the device is included on the list of water treatment devices published on the state board's Internet Web site pursuant to Section 116845.

(b) After July 1, 2015, the exterior packaging of a water treatment device for which a health or safety claim is made, and that is offered for sale in a retail establishment in California, shall clearly identify the contaminant or contaminants that the device has been certified pursuant to subdivision (a) to remove or reduce. If a device has been certified to remove or reduce more than five contaminants, at least five contaminants shall be listed on the exterior packaging followed by a statement directing consumers to visit the manufacturer's Internet Web site to obtain information regarding additional contaminants that the device is certified to remove or reduce.

(c) After July 1, 2015, the manufacturer of a water treatment device for which it makes a health or safety claim shall include with each water treatment device offered for sale in California a decal that may be affixed to the device by the consumer that states, at a minimum, the following: