The largest annual decreases in fly-tipping incidents were seen in Ceredigion (65%), Vale of Glamorgan (52%), Neath Port Talbot and Powys (both 26%).
Gwelwyd y gostyngiadau blynyddol mwyaf mewn digwyddiadau tipio anghyfreithlon yng Ngheredigion (65%), Bro Morgannwg (52%), Castell-nedd Port Talbot a Phowys (26% ill dau).