As an express condition of the imposition and collection of fees as established by this chapter, each local entity receiving and collecting such fees shall be conclusively presumed to have agreed to hold Sierra County harmless and shall indemnify and defend the county against all actions, claims and damages related to said fees, including, without limitation, any challenge to the validity of or use of said fees. Each local entity receiving and collecting development fees shall be solely responsible for the refunding of any fees as may otherwise be required by law.