The Environmental Protection Agency has not had any regulatory changes to the standards for fluoride at this time. However, the Department of Health and Human Services has made a change to the level of fluoride recommended for systems that fluoridate their water supply. The old values was a range on between 0.7 and 1.2 mg/L that varied by the ambient air temperature in differing states. Now there is only one level—0.7 mg/L for the entire country.
The Safe Drinking Water Act (SDWA) requires EPA to review each National Primary Drinking Water Regulation (NPDWR) at least once every six years and revise them, if appropriate. The purpose of the review, called the Six-Year Review, is to identify those NPDWRs for which current health effects assessments, changes in technology, and/or other factors provide a health or technical basis to support a regulatory revision that will maintain or strengthen public health protection. The third Six-Year Review is ongoing.