Up until 31 March 2018, landfill tax was collected and managed in Wales by HMRC on behalf of the UK government.
Hyd at 31 Mawrth 2018, roedd y dreth dirlenwi’n cael ei chasglu a’i rheoli yng Nghymru gan Cyllid a Thollau EM ar ran Llywodraeth y Deyrnas Unedig.