For fastest processing, click "OMVCR". This article will explain the laws regarding crash reports in the state of Washington, describe how to file a report, and discuss why contacting law enforcementYou need to file a report within 4 days to the State Department of Motor Vehicles. WSP link to file an accident report. Contact the Law Enforcement Agency 2. In Washington, you're required to report a car accident within four days. If law enforcement responds, they will file a report in most cases. An accident report must be filed 5-30 days after the accident, depending on your state. If you are filing a crash report for an accident that you were involved in, you must complete a report within four days. If you are filing a crash report for an accident that you were involved in, you must complete a report within four days.