ðɪs lˈɪst ʌv wˈɛlʃ lˈeɪks ˈɔːɹdɚd baɪ jˈuːnɪtˌɛɹi ɐθˈɔːɹɪɾi ɪŋklˈuːdz lˈeɪks wɪð ɐ sˈɜːfɪs ˈɛɹiə ʌv ɡɹˈeɪɾɚ ðɐn , bˌʌt ɛksklˈuːdz ðoʊz lˈeɪks ænd pˈɑːndz kɹiːˈeɪɾᵻd æz pˈɑːɹt əvən ˈæktɪv ɪndˈʌstɹɪəl sˈaɪt ˈaɪ.ˈiː., wˈɜːks pˈɑːndz ænd ˈɔːlsoʊ ɛksklˈuːdz sˈɜːvɪs ɹˈɛzɚvwˌɑːɹz jˈuːzd tə stˈoːɹ dɹˈɪŋkɪŋ wˈɔːɾɚɹ æz pˈɑːɹt ʌvðə wˈɔːɾɚ səplˈaɪ sˈɪstəm.
This list of Welsh lakes ordered by unitary authority includes lakes with a surface area of greater than , but excludes those lakes and ponds created as part of an active industrial site (i.e., works ponds) and also excludes service reservoirs used to store drinking water as part of the water supply system.