Backflow Prevention Practice Study Guide Questions and Answers 2026

Backflow Prevention Practice Study Guide Questions and Answers 2026 Containing a plumbing system from the public water supply requires backflow protection at the _______? A. Appliance or fixture B. Building foundation C. Irrigation system D. Service Connection E. Sprinkler riser - Correct Answer Service Connection Backflow preventer manufacturers recommend that assemblies be field-tested annually and when_____? A. Installed B. Moved C. Repaired or Installed D. Shut down E. Water suppliers provide notice - Correct Answer Repaired or Installed A differential pressure gauge reading of 0.2 psid is represented on water column sight tube by _____? A. 1/16 in. (0.16 cm) B. 1/2 in. (1.3 cm) C. 2 in. (5.1 cm) D. 3.5 in. (8.9 cm) E. 5.5 in. (14 cm) - Correct Answer 5.5 in. (14 cm) Pollution of a public water supply suggests the substance in the water is ____? A. Aesthetically bad B. Biological with virus only C. Lowering the pH below 1.4 D. Radiological E. Toxic - Correct Answer Aesthetically bad Backsiphonage may occur when the pressure inside copper tubing is ____? A. Greater than atmospheric pressure B. Greater than barometric pressure C. Greater than 0 gauge pressure D. Less than absolute pressure E. Less than atmospheric pressure - Correct Answer Less than atmospheric pressure A cross-connection may be a permanent piping arrangement or a(n) ____? A. Backflow preventer B. Church symbol C. OSHA hazardous area designation D. Railroad and highway intersection sign E. Temporary hose bibb connection - Correct Answer Temporary hose bibb connection The isolation of a plumbing water system hazard requires____? A. Appliance protection B. Building quarantine C. High-hazard protection D. Meter protection E. Toxin monitoring - Correct Answer Appliance protection A direct cross-connection suggests the piping system may be subjected to ____? A. Backpressure or backsiphonage B. Backsiphonage only