From the 2019–20 season it operated at the third level of the Welsh football league system.

If the Division champions' ground did not meet Premiership standards, then the team which finished second may have been promoted.

The team which finished in bottom position was relegated to the Welsh Football League Division Two.

In 2019 it became level three of the Welsh Football Pyramid following the creation of the Cymru South.

Since its inception in 1904 it has always been the top flight of the Welsh League for the teams located in South Wales.