Whether the Act's general statement that each State "shall be responsible" for providing disposal capacity independently commanded States to legislate and regulate.
Holding
No. The Court construed the statute as a set of incentives rather than as an independently enforceable command to regulate.
Reasoning
Read in isolation, the statutory word "shall" could appear to impose a direct federal command on States. But the Act was also plausibly read as establishing choices through its accompanying incentives. The Court declined to adopt the construction that would upset the usual federal-state balance without a clear statement from Congress.
The canon of constitutional avoidance reinforced that reading. Construing the provision as a freestanding order to enact and enforce a federal regulatory program would raise serious Tenth Amendment concerns, so the Court read the Act as a whole rather than treating its general statement of state responsibility as independently coercive.