WA HB2421

Beginning January 1, 2035, prohibits manufacturing, selling, or distributing new tires in Washington containing intentionally added 6PPD or "regrettable 6PPD substitutes" that the Department of Ecology determines are not safer alternatives

Imposes a 6PPD mitigation fee on retail sales of new replacement tires containing 6PPD starting January 1, 2027: $3 per tire for load ratings up to 2,500 pounds, $6 per tire for higher load ratings, with 10% annual increases thereafter

Creates the 6PPD mitigation account to fund stormwater monitoring, salmonid mortality surveys, Department of Ecology implementation costs, and cleanup of illegally dumped tires near fish-bearing streams

Establishes civil penalties of up to $5,000 per first violation and $10,000 per repeat violation for non-compliance, with appeals to the pollution control hearings board

6PPD-quinone, formed when 6PPD in tires is exposed to air, causes "urban runoff mortality syndrome" that kills coho salmon before spawning and is toxic to other aquatic species