Washington Petition To Modify Child Support Order is a legal document used to request a change in the amount of child support due from one parent to another. It is used when the circumstances of either parent or the needs of the child have changed since the last child support order was issued. The petition can be filed in the superior court in the county where the child resides or where either parent resides. There are two types of Washington Petition To Modify Child Support Order: a Motion To Modify Child Support and a Petition To Modify Child Support. The Motion To Modify Child Support is used when a parent is asking for an immediate change in the amount of child support due and can be filed without giving prior notice to the other parent. The Petition To Modify Child Support is used when a parent is asking for a long-term change in the amount of child support due and requires that the other parent be notified of the request. Both types of Washington Petition To Modify Child Support Order must include information about the current child support order, the changes being requested, and the reasons for the request.