If any provision of this chapter or the application of it to any person or circumstance is held invalid, the invalidity shall not affect other provisions or applications of this chapter which can be given effect without the invalid provision or application, and to this end the provisions of this chapter are severable. If any method of notification provided for in this chapter is held invalid, service as provided for by the laws of the state for service of process in a civil action shall be substituted for the method held invalid.