Principal councils must consult locally before exercising their power to change the voting system, and if they do change, they must use the new system for the next 2 rounds of ordinary elections.
Nid yw’r opsiwn pleidlais sengl drosglwyddadwy yn Neddf 2021 yn berthnasol i gynghorau cymuned, a bydd eu hetholiadau’n parhau i ddefnyddio’r system cyntaf i’r felin.