"I assumed they were aspiring to be more than a regional facility. With their points scattered around the West as an illustration of their rapid turn around, Including Del Rio. Texas"

If I am not mistaken, they started out doing forage analysis,  and then expanded into soil testing. 

I met with the president of the lab about a year or three ago.  He told me at that time that water testing had become their number 1 testing service;  hence, the name change to Pioneer Water Testing lab. 

If you look at water testing, or forage testing,  I would have no doubt that you could use any lab in the country.  However, for soil testing, I would see it differently.

If you look at the example soil test report, it states on that page that recommendations are for typical PA soils, and are guidelines only.  I think that says to me what their expectations are.