Mae Llywodraeth Cymru yn cefnogi'r cynllun cenedlaethol Dinas i'r Môr, gyda dros 600 o orsafoedd ail-lenwi eisoes wedi cofrestru ledled Cymru a mwy yn ymuno pob wythnos. Mae Llywodraeth Cymru hefyd wedi ariannu fersiwn Gymraeg o'r ap Ail-lenwi.
The Welsh Government is supporting the national roll-out of the scheme by City-To-Sea, with over 600 refill stations already signed up across Wales and more joining every week. The Welsh Government has also funded a Welsh language version of the Refill app.