Too many rivers are currently polluted by agricultural activities from acute incidents of point source discharges to water and the cumulative effect of diffuse pollution.
Mae gormod o afonydd yn cael eu llygru gan weithgareddau amaethyddol ar hyn o bryd, o achosion acíwt o lygru o darddleoedd penodol i ddŵr ac effeithiau cronnol llygredd gwasgaredig.