On October 19, 2011, the US Food and Drug Administration (FDA) modified its regulations for bottled water quality standards to establish a maximum allowed level of 0.006 mg/L for the chemical di(2-ethylhexyl)phthalate (DEHP), bringing it into line with existing regulations for tap water. The modification to regulation 21 CFR 165.110, will require bottled water manufacturers to monitor their finished products, and the source water, for DEHP content on an annual basis. The new regulation takes effect on April 16, 2012.