Washington state gas prices are among the highest in the US, driven by a combination of global oil volatility and local climate policy. A significant portion of the cost stems from the Climate Commitment Act, which requires refineries to purchase carbon credits to offset emissions. These carbon costs, combined with high state fuel taxes and the seasonal shift to lower emission summer blends, create a cumulative price increase for consumers. The state uses these funds to support transportation infrastructure and climate goals in the absence of a state income tax.
