coming into this late. IDK where you are in AZ but I lived 35+ yrs (currently in PA for a time until we can get back to AZ).
Check the EPA site & "Superfund sites", US Geological, etc.... In Scottsdale, there is a serious superfund site, no thx to Motorola, as well in e. PHX & in Maryvale area there was a cluster of childhood cancers/leukemias.
Every state has these polluted areas - some worse that others.
Also, some areas in some states have old mines & landfill...