Furthermore, respondents were most likely to report that concerns about water quality would put people off from swimming in OIW.
At hynny, roedd yr ymatebwyr yn fwyaf tebygol o ddweud mai pryderon am ansawdd dŵr fyddai’n gwneud nofio mewn dŵr mewndirol awyr agored yn llai deniadol i bobl.