Washington Petition To Invalidate (Annul) Registered Domestic Partnership is a legal document that is used to terminate a registered domestic partnership in the state of Washington. This document is used when one or both of the partners in the domestic partnership no longer wish to be legally bound to each other. The Petition must be filed with the court in the county where the couple resides. The Petition outlines the reasons why the partners want to annul their registered domestic partnership. Grounds for annulment can include fraud, mental illness, or lack of legal capacity. It must be signed by both partners and notarized. There are two types of Washington Petition To Invalidate (Annul) Registered Domestic Partnership: one for couples who have been married for less than five years, and one for couples who have been married for five or more years. Both of these documents are available online and must be completed and filed with the court. Once the Petition is filed, the court will review it and make a decision. If the court approves the Petition, the registered domestic partnership will be annulled and the couple will no longer be legally bound to each other.