Depending on the type of pest problem you have will depend on what method is used to get rid of the problem. First of all, all pesticides being used by the exterminator must be registered by the Environmental Protection Agency. This agency is responsible for testing and registering all pesticides. By law, the Environmental Protection Agency is not allowed to register any pesticide unless it can be utilized according to its label and label instructions without harming the user, people, domestic animals, pets or their environments. There are some exterminators who use natural or organic pesticides. Organic pesticides refer to those that contain carbon. Natural pesticides indicates the pesticide contains some materials that are natural. Organic-based pesticides indicate the product contains some organic materials.