The justices will consider whether to hit pause on a federal rule designed to reduce air pollution that drifts across states and can cause health troubles.
Most cities would have to replace lead water pipes within 10 years under new rules proposed by the Environmental Protection Agency aimed to prevent like the ones in Flint, Mich. and Washington, D.C.
The rules would lower emissions of mercury and other toxic pollutants that can harm brain development of young children and contribute to heart attacks and other health problems in adults.
The agency's decision allows California — which has some of the nation's worst air pollution — to require truck manufacturers to sell more zero-emission trucks over the next couple of decades.
The EPA proposed limiting the amount of harmful "forever chemicals" in drinking water to the lowest detectable levels, a move it said will save thousands of lives and prevent serious illnesses.
The Biden administration finalized regulations that protect small streams, wetlands and other waterways, repealing a Trump-era rule that environmentalists said left waterways vulnerable to pollution.
Dozens of projects will receive millions to boost monitoring near industrial sites. The Biden administration wants to focus on environmental justice in communities impacted by decades of pollution.