Ym mis Hydref 2021, cyhoeddodd Llywodraeth Cymru restr o'r tomenni fesul Awdurdod Lleol gyda'r tomenni oedd angen eu harchwilio'n amlach yn cael eu categoreiddio'n rhai C a D.
In October 2021, the Welsh Government published a breakdown of tips by Local Authority and classifications where sites that require frequent inspections were labelled as C and D.