We have just had the Tot Llatje water diviner wave his wands over our property. Very impressive.

He has marked the spot where the divining rods went wild and judges that there is a very good supply of water 150 metres down. Current drilling cost is 76 € per metre plus IVA plus pump and 3 phase generator. Not cheap, but if it provides a good supply of potable water, well worth it in the longer term.

IMO you cannot compare the cost vs tankering in water. It is a capital investment, not an ongoing expense, so has to be looked at in a different way.

PB