A county council may agree to contribute a sum equal to the whole or any part of any expenses incurred by the council of a county district within the county in connection with hospital accommodation, sewers or sewage disposal works, or a supply of water, if it appears to the county council to be reasonable so to do having regard to the resources of the district and the other circumstances of the case.

For the purposes of the preceding subsection, contributions by the council of a county district towards the expenses of a joint board shall be deemed to be expenses incurred by the contributing council.