Yng Nghymru, cafodd awdurdodau lleol wybod am y broblem bosibl â RAAC drwy Gymdeithas Llywodraeth Leol Cymru ym mis Chwefror 2020 yn dilyn hysbysiad diogelwch a gyhoeddwyd yn 2019 gan y Pwyllgor Sefydlog ar Ddiogelwch Strwythurol. Mae dyletswydd statudol ar bob awdurdod lleol i asesu cyflwr adeiladau ac unrhyw risgiau diogelwch, gan gynnwys uniondeb strwythurol pob adeilad o fewn ei ystâd, ac i gadw cofnodion.
In Wales, local authorities were made aware of the potential issue with RAAC through the Welsh Local Government Association (WLGA) in February 2020 following a safety alert published in 2019 by the Standing Committee on Structural Safety (SCOSS). Local Authorities have a statutory duty to assess condition and safety risks including structural integrity for all buildings within their school estate and to maintain records.