You should probably check what local laws apply to your situation so you know what your legal obligations are wherever your apartment is.

Also, from a practical perspective, if one unit is in fact infested there is a chance other connected units are infested too. You will need to check those other units which will require you to inform those tenants. Consider what might happen if a tenant from an infested unit puts their nightstand out by the trash and a tenant from a non-infested unit takes it home and infests their unit. Now you have a big problem that is spreading and will cost you more money the farther it spreads.

It might be most economical in the long run to simply be open about the problem, educate the tenants and do what needs to be done to address the problem.