OLYMPIA — More than 75% of Washington residents choose to not litter and about 26% of litterers would be motivated to stop if a friend, family member, or passenger asked them to refrain, according to 2021 research commissioned by the Washington State Department of Ecology (Ecology). These numbers sound promising, but the truth is that more than 18 million pounds of litter accumulate annually on Washington’s roads, parks and recreation areas.

Preliminary results from a 2022 statewide litter study show 24,001 litter items per mile on Washington’s urban interstate highways. Plastic food wrappers, snack bags and cigarette butts are some of the most commonly found items. In Ecology’s 2021 research, people also identified not having a car trash bag as the top reason that they litter.