Mae Cynlluniau Rheoli Basn Afon yn tynnu sylw at lygredd gwasgaredig fel rheswm allweddol dros beidio â chyrraedd statws ecolegol da mewn nifer o afonydd ledled Cymru.  Mae Llywodraeth Cymru wedi gofyn i Asiantaeth yr Amgylchedd gynhyrchu Cynllun Gweithredu Llygredd Gwasgaredig er mwyn mynd i’r afael â ffynonellau ystod eang o achosion o lygredd dŵr gwasgaredig; gan amlinellu atebion i fynd i’r afael â’r broblem mewn ardaloedd gwledig a dinesig.  Rydym wedi gofyn i Asiantaeth yr Amgylchedd lunio’r cynllun gweithredu erbyn gwanwyn 2012, er mwyn mynd i’r afael â phroblemau yn y cylch presennol o Gynlluniau Rheoli Basn Afon ac i fwydo i’r ail gylch cynllunio ar gyfer y Gyfarwyddeb Fframwaith Dŵr.
The River Basin Management Plans highlight diffuse pollution as a key reason for failure to meet good ecological status in a number of rivers across Wales.  The Welsh Government has tasked the Environment Agency to produce a Diffuse Pollution Action Plan in order to tackle sources on a wide range of diffuse water pollution; outlining solutions to address the problem in both rural and urban areas. We have asked the Environment Agency to produce the action plan by spring 2012, in order to address problems in the current round of River Basin Management Plans and feed into the second cycle of planning for the Water Framework Directive.