Sterigenics to close its Willowbrook facility Sep 30, 2019 | Health Tech, Legislature, Top Stories Sterigenics announced Monday it will close its sterilization facility in Willowbrook, citing an “unstable legislative and regulatory landscape.”To access this content, you must purchase 1 Year Health News Illinois Subscription or 1 Year Group Subscription - Up to 5 Users, or log in if you are a member.