Yng Nghymru, cafodd awdurdodau lleol wybod am y broblem bosibl sy'n gysylltiedig â RAAC drwy Gymdeithas Llywodraeth Leol Cymru (CLlLC) ym mis Chwefror 2020, yn dilyn rhybudd diogelwch a gyhoeddwyd yn 2019 gan y Pwyllgor Sefydlog ar Ddiogelwch Strwythurol (SCOSS). Mae gan awdurdodau lleol ddyletswydd statudol i asesu risgiau cyflwr a diogelwch adeiladau, gan gynnwys uniondeb strwythurol pob adeilad o fewn eu hystâd ysgolion, 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.