Seven states, including Pennsylvania and New Jersey, are at different stages of a multiyear process for setting their own drinking water standards for PFOA and PFOS, the two perfluoroalkyl substances (PFAS) that have been the focus of most efforts. The EPA has said it will take several years to establish PFAS standards. Pennsylvania is working to establish its own standards within two years.

*In 2018, New Jersey became the first state to establish a drinking-water standard for PFNA, another type of PFAS.

It is the only enforceable standard in the country to date.