I have an on-site ‘snake alarm’...my wife sees one, the whole county will know it.
The vast majority are harmless. Do you know how to tell them apart from a pit viper? Shape of the head, the eyes, the “pit” between the eyes, in addition to markings and coloration. Kill the poisonous ones, leave the rest alone, they’re beneficial. They eat vermin which helps keep the poisonous ones away.