These maps show areas that are below 2,500 feet in elevation (2,000 feet for Yakima County) and are not state, federal, or tribal lands. With a few exceptions, fruit trees are unlikely to have been grown on state or federal lands, or at elevations greater than 2,000 or 2,500 feet (based on the highest elevation of historical orchard locations in Yakima and Chelan counties). On the Yakima County map, an area west of Wapato where apple and pear trees were historically grown is shown as potentially affected, even though the Yakama Nation owns it.
Areas where lead-arsenate pesticides were potentially used in Chelan County based on land-use information.
Areas where lead-arsenate pesticides were potentially used in Okanogan County based on land-use information.
Areas where lead-arsenate pesticides were potentially used in Yakima County based on land-use information.