Whether the OSH Act preempts nonconflicting state occupational safety and health standards when OSHA has issued a federal standard on the same issue and the State lacks an approved state plan.
Holding
Yes. The OSH Act impliedly preempts nonapproved state regulation of an occupational safety and health issue covered by a federal OSHA standard, even when compliance with both rules is possible.
Reasoning
The Court treated congressional intent as the controlling question and read § 18 of the OSH Act as a coordinated system. Section 18(a) preserves state authority over occupational safety and health issues only when no federal standard is in effect. That limited preservation would be largely unnecessary if States remained free to add their own standards whenever federal standards existed.
Section 18(b) provides that a State wishing to assume responsibility for developing and enforcing standards on an issue covered by a federal standard must submit a plan for federal approval. Read with the rest of § 18, this means that a State cannot merely supplement federal OSHA standards without approval; it must obtain approval for a plan that displaces the applicable federal regime.
Other provisions reinforced that reading. Section 18(c) subjects state plans to federal review, including review for undue burdens on interstate commerce; § 18(f) contemplates loss of state enforcement authority if plan approval is withdrawn; and the transitional provision in § 18(h) reflected an understanding that states needed federal permission to continue enforcing their own standards after federal standards took effect.
Congress sought not only safer workplaces, but also a regulatory structure in which employers and employees face one governing set of occupational-safety rules: either federal rules or federally approved state rules. A supplementary state rule can therefore obstruct Congress's chosen method even if it pursues the same ultimate goal of worker safety and does not make compliance with federal law impossible.】【。},{