Maricopa and Pinal counties have lots of agricultural water that either comes directly off the Colorado river via canal, or is pumped from shallow alfalfa field runoff groundwater that is too full of nitrates to be even remotely potable.

We also, unlike the CA Central Valley or the Midwest who are apparently cool with depleting their resources as fast as humanly possible, are acutely aware of our groundwater supply constraints, given that we live in a desert, and practice a lot of aquifer recharge and management.

Intel cleans it, uses it, and dumps it into aquifer recharge, which cleans it even further.