The district and the public utility operating the existing system may agree upon the purchase price or they may agree that the purchase price is to be established by arbitration and upon the method of naming arbitrators and the method of conducting such arbitration. If they do not, the purchase price may be fixed and judgment entered thereon in a suit brought either by the public utility or the district in the superior court in and for the county in which is located that portion of the existing system to be acquired by the district which has the highest value.