If you have taken the home study method, or you feel you have the knowledge or you need to re-certify (certificate is valid for 5 years), take the Challenge Exam to earn your Region of Waterloo Public Health Food Safety Certificate. Only those receiving 70% or higher on their test will receive a certificate. (includes the exam only). NOTE: You must pre-register for the exam. Check our website for the most up-to-date schedule.