Environmental Conservation Fire Services & Emergency Preparedness Keep Markham Beautiful Recycling & Garbage Roads & Sidewalks Traffic Trees Walking and Cycling Learn more about Active School Travel (AST). Water & Sewer Good Neighbour Handbook Neighbourhood Services Water & Sewer Backflow Prevention Online Services Submit a Backflow Preventer Test & Inspection Report BACKFLOW PREVENTION PROGRAM - SUBMIT A BACKFLOW PREVENTER TEST & INSPECTION REPORT Loading...