As long as the water is being locally used and locally discharged (i.e. via a drainage field) it shouldn't seriously have an impact. The water would return to the water table and either be used by plants or get wicked back into the air via capillary action from evaporation on the surface.
replyIn places with low ambient humidity, harvesting water from the air is an atrocious process. The physics have not changed since people came up with this idea the last time, and the time before that.
replyFor reasons of thermodynamics, pulling water out of the air uses more energy than desalination, and that's before the fact that you have to have a large fan to move a large volume of air to get a few drops of water.
It is on the order of using 60X as much energy to dehumidify air if you are trying to produce bulk water, rather than just desalinating water through a method like reverse osmosis
When these systems are designed for low ambient humidity areas, they use a desiccant based first stage, where desiccant wheel or loop captures water from the low humidity air, and then is heated in a chamber to "regenerate" it and drive off the water into a 100% humidity chamber where the condensation can happen.
replyThe applications of condensate water sources typically aren't in areas where desalination is the competing technology -- usually the competition is piping water in from far away via a utility system.