We have a cottage on our yard fed water on a sub meter. The occupants pay the going rate for water used and 50% of the standing charge. All good so far, last year we had a leak in the pipe feeding from water boards main (1200m of private pipe over 50 yrs old) I put in a new pipe along part of the run where I found the leak as I have my own digger. Would it be reasonable to expect the other party to pay 50% of the cost (pipe, fittings and my time)