During 2017-18, billing authorities collected £27 million of arrears and wrote off £7 million as bad debts.
Yn ystod 2018-19, casglwyd £27 miliwn o ôl-ddyledion o ran blynyddoedd blaenorol gan awdurdodau bilio, a chafodd gwerth £6 miliwn eu dileu fel dyledion drwg.