City of Philadelphia v. New Jersey

New Jersey (defendant) passed a law banning other states' waste from being deposited in its landfills, citing environmental preservation and a desire to avoid overburdening its landfills and raising disposal costs for its own residents. The City of Philadelphia and private landfill owners (plaintiffs) sued, arguing the ban unconstitutionally restricted interstate commerce; the New Jersey Supreme Court upheld the statute, and Philadelphia appealed to the U.S. Supreme Court.