Washington Application for Pump Installer Combination General Contractor Registration and Electrical Contractor License is an application that must be completed by contractors in the state of Washington in order to become licensed and perform electrical and general contracting work. This application is required for individuals and organizations wishing to work as pump installers, combination general contractors, and electrical contractors in Washington. There are four different types of this application: the Pump Installer Registration Application, the Combination General Contractor Registration Application, the Electrical Contractor License Application, and the Limited Electrical Contractor Registration Application. The Pump Installer Registration Application is for those wishing to install pumps. The Combination General Contractor Registration Application is for those wishing to perform all aspects of general contracting work. The Electrical Contractor License Application is for those wishing to perform electrical work. The Limited Electrical Contractor Registration Application is for those who wish to only perform limited electrical work.