Can the mosque's water bill be paid from mosque donations if the pipe feeds both the mosque and the house, and the bills are separate?

It is permissible to pay the outstanding bills of the mosque from donations allocated to it, if custom dictates that this is in the mosque's interest and does not contradict the donor's intention. However, if some donors earmark their money for a specific purpose, their intention must be respected. But if custom dictates that spending money for this purpose is not in the mosque's interest, then it is not permissible to use donations for it; rather, donations should be specifically requested for this purpose.