437 U.S. 617 (1978) (U.S. Supreme Court)
City of Philadelphia v. New Jersey is a cornerstone Dormant Commerce Clause case that clarifies the constitutional limits on a state's ability to isolate itself from perceived external harms by discriminating against interstate commerce.
Does a state law that bans the importation of out-of-state solid waste, while allowing disposal of identical in-state waste, violate the Commerce Clause's prohibition on state discrimination against interstate commerce?
Under the Dormant Commerce Clause, state laws that discriminate on their face against interstate commerce are virtually per se invalid. Such a law can be sustained only if the state demonstrates that it advances a legitimate local purpose that cannot be adequately served by reasonable, nondiscriminatory alternatives. Mere economic protectionism is not a legitimate purpose. Although states may adopt true quarantine measures against articles that are inherently dangerous in a way that cannot be mitigated by neutral regulation, they may not discriminate based solely on origin when the purported harm is not unique to out-of-state goods. If a law regulates evenhandedly and only incidentally burdens interstate commerce, it is evaluated under Pike v. Bruce Church, Inc.'s balancing test.
Yes. New Jersey's ban on importing out-of-state waste is a facially discriminatory regulation of interstate commerce that violates the Commerce Clause. The judgment of the New Jersey Supreme Court was reversed.
City of Philadelphia v. New Jersey is a leading Dormant Commerce Clause decision establishing that facially discriminatory state regulations are almost always invalid unless they fit within a narrow quarantine-type exception or are the least discriminatory means to achieve a compelling local aim. It underscores that environmental and resource-conservation goals, while important, must be pursued through evenhanded regulation when possible. The case anchors a line of later decisions invalidating discriminatory waste-management measures (e.g., Fort Gratiot Sanitary Landfill, Chemical Waste Management, Oregon Waste Systems) and contrasts with Maine v. Taylor, where a true quarantine justified discrimination. For students, it is a canonical example of the anti-protectionist principle and the requirement to consider reasonable, nondiscriminatory alternatives.