One huge change that came with the new Minnesota State Plumbing Code that went into effect on January 23rd of this year was the requirement for annual backflow preventer testing. Here's the exact code ...

The Backflow Prevention Program's purpose is to prevent the backflow of potentially contaminated water from buildings considered severe and moderate hazard risks to the City's drinking water system.

Pressure loss in the water meter allows gas to expand, and since most water meters in use, including turbine meters, single jet, multi-jet and other positive displacement meters, measure volumetric ...