An applicant accepts a permit to appropriate water upon the condition that no value in excess of the amount paid to the state shall be claimed for the permit or for the rights so acquired when a public authority is regulating or fixing the rate or charges of the services to be rendered by the permittee, his successors or assigns, or when the state, county, city, town, municipal water or irrigation district, or any political subdivision of the state, is seeking to acquire the rights and property of the permittee, his successors or assigns.