Extent Maps

Efforts continue in the fight against Hemlock Woolly Adelgid (HWA) in and beyond Ottawa County. Surveys and treatments continue to be managed on both public and private property. The four-county quarantine on eastern hemlocks is still in effect, which means if you see trimmed hemlock branches while out for a walk, do not move them (even if there is no detectable HWA). Moving branches with needles is illegal at this time, since it can spread HWA.

Maps updated December 2023

Click below to view an HWA extent map for each county: