Sian Williams is a Grade 3b Referee from Johnstown in Wrexham meaning she can officiate on the Referees Panel of the Directly Affiliated Leagues at Tier 4 of the Pyramid (Welsh League Division 3, SPAR Mid Wales Division 2, Welsh National League Division 1, Welsh Alliance League Division 1) and at an area level and act as Assistant Referees at Tier 2 & 3.