When do you need a pest control contractor? When you have an emergency pest problem and you do not know how to proceed. Wasps, rats indoors and bats are common emergencies. When you are required by law to have a pest control service contract. Medical research facilities and new construction and demolition projects are examples. After you have identified the pest, understood its biology and basics of control, and have attempted non-chemical efforts on your own. How do you chose a pest control contractor? Membership in professional organizations. Referral from respected customers. Checked out with the Pesticide Bureau. What to look for in a pest control contract Guaranees and claims of safety. Sample labels and fact sheets. Record keeping issues. Notification.