Mae o leiaf 698 o safleoedd yng Nghymru allai fod wedi eu llygru gyda chemegion neu fetelau gwenwynig a allai beri risg uchel i iechyd y cyhoedd, yn ôl ymchwil gan y BBC.
Dywedodd 13 o’r 22 cyngor sir wnaeth ymateb i gais y BBC am wybodaeth bod bron i 700 safle a allai beri risg uchel.
O’r rheiny, dim ond 112 o’r safleoedd sydd wedi cael eu harchwilio – er ei bod hi’n ofynnol i gynghorau archwilio safleoedd a allai fod wedi eu llygru.
Dywedodd y naw awdurdod lleol arall nad oedden nhw’n gallu, neu’n anfodlon rhannu’r wybodaeth gyda’r BBC.
Mae Cymdeithas Llywodraeth Leol Cymru yn cydnabod fod profi safleoedd sy’n cael eu hystyried yn risg uchel yn bwysig, ond bod hynny’n anodd oherwydd diffyg arian.
Dywedodd llefarydd ar ran Llywodraeth y Deyrnas Unedig eu bod wedi comisiynu adolygiad i edrych ar y sefyllfa, ond does dim mwy o arian wedi’i glustnodi ar hyn o bryd.
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