State Authority to Enforce Environmental Standards Stricter Than Federal Requirements

This opinion from the Washington Attorney General examines the state's authority to establish and enforce environmental standards that exceed federal requirements under the Clean Air Act, Clean Water Act, and other federal environmental statutes. It analyzes federal preemption and savings clauses in major environmental laws.

The opinion discusses Washington's Climate Commitment Act, the state's authority to adopt California's vehicle emission standards under the Clean Air Act's Section 177 provision, and state water quality standards that exceed EPA's recommended criteria.

The opinion concludes that federal environmental statutes generally establish a floor rather than a ceiling, permitting states to adopt more stringent standards. It identifies specific areas where federal preemption limits state authority and recommends coordination with federal agencies to ensure consistent enforcement.