When I lived there the most pollution came from the APS power plants just south of there on the Navajo reservation.
Farmington had it’s own little power plant on the Animas river, but may now use PSNM power. I don’t know if the Navajo Dam produces power or not.
My favorite hunting area near the Pruitt Mine north of Farmington near the Colorado border was strip mined. I believe they got all the recoverable coal they could. They had their own road from the mine near La Plata to the power plant.
That's correct - I don't know their status, maybe EPA is after them too.