The Wisconsin Department of Natural Resources considers firewood any of the following: limbs, branches, roots, unprocessed logs, lumber, slabs with bark, cut firewood and chips. The agency applies its emerald ash borer firewood rules to any of these types of wood.
If you camp in Wisconsin state parks and forests, you are not allowed to take with you firewood bought more than 25 miles away from the campsite or in another state. Some county and private campgrounds may also have similar restrictions. The Wisconsin Department of Natural Resources offers a map that shows the 25-mile radius around each of the state-owned campgrounds.
The Wisconsin Department of Natural Resources has established emerald ash borer quarantined areas in Brown, Crawford, Fond du Lac, Kenosha, Milwaukee, Ozaukee, Racine, Sheboygan, Vernon, Washington and Waukesha Counties. Firewood from these counties or transported through them is not allowed to enter state-owned land regardless of proximity to a campground.
If you're a firewood dealer, you can go through a non-mandatory process to obtain a Wisconsin Department of Agriculture, Trade and Consumer Protection certificate that states your firewood is safe from infectious organisms. The certification is valid for one year and requires passing an inspection that verifies the information you provided in your application is true.
You can take 2x4's and 4x6's leftover from building projects to use as firewood on state land. However, staff at individual parks has the right to ban the use. The Wisconsin Department of Natural Resources doesn't include lumber scraps in its banned firewood list because this type of wood is dried and has no bark, which makes it an enviable home for insects.
