Cite as: 511 U. S. 383 (1994)
Opinion of the Court
diminishes and environmental cleanup costs escalate, measures like flow control become necessary to ensure the safe handling and proper treatment of solid waste.
The teaching of our cases is that these arguments must be rejected absent the clearest showing that the unobstructed flow of interstate commerce itself is unable to solve the local problem. The Commerce Clause presumes a national market free from local legislation that discriminates in favor of local interests. Here Clarkstown has any number of nondiscriminatory alternatives for addressing the health and environmental problems alleged to justify the ordinance in question. The most obvious would be uniform safety regulations enacted without the object to discriminate. These regulations would ensure that competitors like Carbone do not underprice the market by cutting corners on environmental safety.
Nor may Clarkstown justify the flow control ordinance as a way to steer solid waste away from out-of-town disposal sites that it might deem harmful to the environment. To do so would extend the town's police power beyond its jurisdictional bounds. States and localities may not attach restrictions to exports or imports in order to control commerce in other States. Baldwin v. G. A. F. Seelig, Inc., 294 U. S. 511 (1935) (striking down New York law that prohibited the sale of milk unless the price paid to the original milk producer equaled the minimum required by New York).
The flow control ordinance does serve a central purpose that a nonprotectionist regulation would not: It ensures that the town-sponsored facility will be profitable, so that the local contractor can build it and Clarkstown can buy it back at nominal cost in five years. In other words, as the most candid of amici and even Clarkstown admit, the flow control ordinance is a financing measure. By itself, of course, revenue generation is not a local interest that can justify discrimination against interstate commerce. Otherwise States could impose discriminatory taxes against solid waste origi-
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