“A lake provides the water.”
A lake also provides open space where federal law enforcement can arrest anyone who leaves the building to fetch water.
Do a map search -— Malheur National Wildlife Refuge.
You will see that this Federal facility is a every large complex including family housing, repair shops, temp quarters for seasonal workers, heavy equipment, numerous trucks of all types, an administration offices, etc etal.
As long as the well pumps have power water should be no problem.