well water is still cheaper than desalinized water by a long shot.
However, in the next decade or less— likely the
cost of desalinized water will drop below well water.
But I don’t think that’s generally known.
There’s right now a growing fund of money world wide going into desalination research—as cheap desalinized water will be one of the keystone technologies of the 21st century.
That works, provided there are non-brackish wells. :’)