The department may accept from the United States or any of its agencies such funds as are available to this state or to any other unit of government for carrying out the purposes of this chapter, whether the funds are made available by grant, loan, or other financing arrangement. The department may enter into such agreements and other arrangements with the United States or any of its agencies as may be necessary, proper, and convenient for carrying out the purposes of this chapter, subject to RCW 47.29.080.