EPA finalized technology reviews conducted for NESHAPs for gasoline distribution facilities and the review of new source performance standards for bulk gasoline terminals. 

EPA finalized a rule to address the unreasonable risk of injury to health presented by methylene chloride under its conditions of use under TSCA. 

EPA designated two per- and polyfluoroalkyl substances (PFAS)—perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), including their salts and structural isomers—as hazardous substances under CERCLA. 

EPA established requirements for legacy coal combustion residuals (CCR) surface impoundments, as well as CCR management units at active CCR facilities and at inactive CCR facilities with a legacy CCR surface impoundment. 

EPA finalized amendments to NESHAPs for the coal- and oil-fired electric utility steam generating units source category.

SIP Approval: Nevada (nonattainment new source review requirements for the 2015 ozone NAAQS for Clark County Department of Environment and Sustainability). 

EPA announced the availability of proposed interim registration review decisions for bromine, and proposed final registration review decisions for agrobacterium radiobacter, polybutene resins, and porcine zona pellucida. 

EPA finalized amendments to the procedural framework rule for conducting risk evaluations under TSCA to better align with the statutory text and applicable court decisions, to reflect the Agency's experience implementing the risk evaluation program following enactment of the 2016 TSCA amendments, and to allow for consideration of future scientific advances in the risk evaluation process without need to further amend the Agency's procedural rule.

EPA made an interim final determination that the California Air Resources Board has submitted a revised rule and has also submitted revised rules on behalf of the San Joaquin Valley Unified Air Pollution Control District, Ventura County Air Pollution Control District, and South Coast Air Quality Management District that correct deficiencies in its CAA SIP provisions concerning ozone nonattainment requirements for controlling volatile organic compounds at crude oil and natural gas facilities. 

SIP Proposal: California (revisions concerning emissions of volatile organic compounds from crude oil and natural gas facilities).