A backflow preventer is a system of inline checks, allowing water to pass down stream but stops water from flowing backwards, through a process of reversed flow known as back siphonage.
Backflow preventers are due for annual inspection and testing for a very important reason. Backflow testing helps to insure the city's water management that all precautions are taken at stopping fire sprinkler, domestic or irrigation water from finding its way backwards in to the city's water main, possibly causing a contamination issue for folks downstream.
Backflow Preventers are found throughout some facilities, but most commonly are located near the road in large and small hot boxes some in pits(undergorund vault) or just take a look in mechanical rooms such the riser and water pump rooms
Covers your Fire Protection System Water supply. Backflow testing for this assembly is due for inspection every year
Covers your Domestic/Drinking Water Supply. Backflow testing for this assembly is due for inspection every year.
Covers your Irrigation System Water Supply. Backflow testing for this assembly is due for inspection every 3 years