In Colorado, a child support judgment is valid for 20 years (and often can be revived for longer). Further, interest has continued to accrue on the liability. If you are owed back-child support, you have many tools at your disposal including foreclosure, liens, garnishments, and levies to name a few. Here are two articles that you might find informative: /colorado/family-law/child-support-contempt-of-court/ and /colorado/family-law/colorado-child-support-attorneys/