Cite as: 504 U. S. 334 (1992)
Opinion of the Court
the disposal of hazardous waste or hazardous substances in Alabama, an additional fee shall be levied at the rate of $72.00 per ton." § 22-30B-2(b).
Petitioner filed suit in state court requesting declaratory relief against respondents and seeking to enjoin enforcement of the Act. In addition to state-law claims, petitioner contended that the Act violated the Commerce, Due Process, and Equal Protection Clauses of the United States Constitution, and was pre-empted by various federal statutes. The trial court declared the base fee and the cap provisions of the Act to be valid and constitutional; but, finding the only basis for the additional fee to be the origin of the waste, the trial court declared it to be in violation of the Commerce Clause. App. to Pet. for Cert. 83a-88a. Both sides appealed. The Alabama Supreme Court affirmed the rulings concerning the base fee and cap provisions but reversed the decision regarding the additional fee. The court held that the fee at issue advanced legitimate local purposes that could not be adequately served by reasonable nondiscriminatory alternatives and was therefore valid under the Commerce Clause. 584 So. 2d, at 1390.
Chemical Waste Management, Inc., petitioned for writ of certiorari, challenging all aspects of the Act. Because of the importance of the federal question and the likelihood that it had been decided in a way conflicting with applicable decisions of this Court, this Court's Rule 10.1(c), we granted certiorari limited to petitioner's Commerce Clause challenge to the additional fee. 502 U. S. 1070 (1992). We now reverse.
II
No State may attempt to isolate itself from a problem common to the several States by raising barriers to the free flow
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