Y Bil Treth Gwarediadau Tirlenwi (Cymru) yw'r trydydd mewn cyfres o dri Bil i sefydlu trefniadau trethi yng Nghymru. Daw ddeufis ar ôl cyflwyno’r Bil Treth Trafodiadau Tir a Gwrthweithio Osgoi Trethi Datganoledig (Cymru).
Landfill disposals tax, like the existing landfill tax which is currently collected in Wales and England, will be a tax on the disposal of waste to landfill. It will be payable by landfill site operators who pass these costs on to waste operators.