The Anne Arundel County Department of Public Works protects public drinking water by requiring ALL homes, businesses, and facilities to install backflow prevention devices. Backflow prevention devices prevent the contamination of your drinking water with non-potable water, solids, or gasses by preventing water from flowing backwards into supply lines at points where cross connections occur. If your home has a lawn irrigation system, the backflow preventer is typically located on the outside of the home. If your home has a fire suppression system, the backflow preventer is typically located in the basement or utility room.
Annual testing of assemblies is required to be performed by certified and County-approved plumbers with an initial test after installation, then annually (or possibly more frequently if deemed necessary with relation to hazard by Anne Arundel County). Anne Arundel Plumbing is certified to test backflow prevention valves in Anne Arundel County.