What is an action threshold from the perspective of a pest exterminator? Action threshold is a common term we hear from athens pest control a pest control guy and this means the point at which an action has to be taken to control the number of pests or to exterminate them. Not all pest problems are addressed drastically right away. Beginning stages of pest infestation does not require yet the use of toxic chemicals and widespread spraying. Instead, a thorough cleaning habit is advices to home owners, if action threshold has not been identified yet so to prevent possible abuse of potent chemicals.