The largest annual decrease in fly-tipping incidents was in Denbighshire (45%), with considerable decreases in Ceredigion, Gwynedd and Monmouthshire (35%, 30% and 29% respectively).
Cafwyd y gostyngiad canrannol uchaf yn Sir Ddinbych (45%) gyda gostyngiadau nodedig yng Ngheredigion, Gwynedd a Sir Fynwy (35%, 30% a 29% yn y drefn honno).