The three top-ranking teams proceed to the knockout phase that culminates with the final match at TEG Cusack Park.
The teams are ranked in the group stage table by points gained, then scoring difference and then their head-to-head record.
The fifth and sixth-placed teams from the group stage, if level on points, take part in a relegation playoff to the Westmeath Intermediate Hurling Championship.
Slevin's Coaches had been providing sponsorship for a number of years and were unveiled as the sponsor of the Westmeath SBHC in July 2020.
In accordance with GAA rules, the County Board awards a set of gold medals to the championship winners.