{"id":11171,"date":"2026-06-22T15:16:38","date_gmt":"2026-06-22T14:16:38","guid":{"rendered":"https:\/\/afonyddcymru.org\/?p=11171"},"modified":"2026-06-22T15:57:03","modified_gmt":"2026-06-22T14:57:03","slug":"llwch-cemegol-llygredig","status":"publish","type":"post","link":"https:\/\/afonyddcymru.org\/cy\/llwch-cemegol-llygredig\/","title":{"rendered":"Delio \u00e2 Llygredd Cemegol"},"content":{"rendered":"

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Cyn y gallwn hyd yn oed ddechrau datrys problem llygredd cemegol Cymru, mae angen i ni ddeall maint y broblem<\/span><\/p>\n

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Dydd Llun 22ain Mehefin, 2026<\/h2>\n

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Mae ymwybyddiaeth y cyhoedd o lygredd cemegol mewn afonydd wedi bod yn cynyddu dros y blynyddoedd diwethaf.<\/p>\n

Mae’r amrediad o gemegau a ddefnyddir bob dydd at bwrpas personol, domestig, diwydiannol, ac amaethyddol yn y DU yn enfawr. Mae llawer ohonynt yn dod i afonydd, trwy orllw, o ddiddisgiadau diwydiannol, yn uniongyrchol drwy ddraeniau neu gan gael ei olchi oddi ar feysydd a meysydd tai. Mae eraill yn cyrraedd trwy dd\u0175r rheilffordd neu’n ymdreiddio oddi ar safleoedd gwastraff tir llygredig a mwynau gollwng.<\/span><\/p>\n

Gellir dod o hyd i PFAS (cemegau tragwyddol), niweidiol i iechyd dynol ac ecolegol, yn bron ym mhob un ohonom, gyda d\u0175r yfed fel y brif gyfrwng.<\/p>\n

\u00a0Mae effeithiau’r sylweddau hyn a phobl eraill arnom ni a’r amgylchedd wedi cael eu dogfennu’n dda. Gallant niweidio ein organau, cynyddu ein cyfraddau canser a effeithio ar ein datblygiad. Mewn bywyd d\u0175r maent yn arwain at golli bioamrywiaeth, tarfu ar gadwyni bwyd ac newid ecoleg afonydd.<\/p>\n

Ac gyda newid hinsawdd yn arwain at ddigwyddiadau glawiad eithafol mwy aml a sy’n rhyddhau mwy o gemegau i afonydd (yn ogystal \u00e2 symud eto’r rhai sydd wedi’u storio yn y m\u00e2n-bres), mae hwn yn broblem sy’n debygol o waethygu yn unig.<\/p>\n

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Mae gan Gymru hanes diwydiannol cyfoethog sy\u2019n cynnwys llawer o byllau mwyn heb eu defnyddio bellach, un o nifer o ffynonellau llygredd cemegol mewn afonydd. (llun: iStock.com\/Robert Thornley)<\/strong><\/p>\n

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Dim dealltwriaeth o’r maint<\/h3>\n

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Er gwaethaf y ymwybyddiaeth hon, nid oes gennym lun cywir o hyd o ba mor llygredig yw’r cemegion yng Nghymru.<\/p>\n

Flwyddyn ddiwethaf, heriodd Afonydd Cymru Lywodraeth Cymru dros fonitro cemegol Cyfoeth Naturiol Cymru ar gyfer asesiadau Cyfarwyddyd Fframwaith D\u0175r.<\/a><\/p>\n

Ein prif bryder oedd, yn absennol monitoriaeth cemegol yng Nghymru, bod 90% o gorffrennau d\u0175r Cymru yn cael eu tybio’n syml i fod mewn Statws Uchel a bod mwy na hanner y corffennau d\u0175r yng Nghymru heb unrhyw ddata monitro cemegol o gwbl. Yn y cyfamser, mae rhaglenni monitro goddefol a astudiaethau unigol ar afonydd yn dangos bod amrywiaeth eang o gemegion mewn lleoliadau uchel.<\/p>\n

Nid oes gennym siawns o ddatrys y mater pan nad oes gennym hyd yn oed ddealltwriaeth sylfaenol o faint y broblem.<\/p>\n

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Safbwynt y Llywodraeth newydd<\/h3>\n

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Mae gan y Llywodraeth newydd swydd ar eu gwefusau. Yn eu maniffesto, addawodd Plaid Cymru weithio i sicrhau bod pob corff d\u0175r yng Nghymru yn cyrraedd statws \u2018da\u2019 o leiaf (er nad oedd yn dweud pryd) ac i gefnogi dull wedi’i arwain gan wyddoniaeth a thystiolaeth.<\/p>\n

Felly, cam rhesymegol cyntaf yn hynny fydd cryfhau monitro cemegol ledled Cymru.<\/p>\n

Hefyd, mae barn dda am awydd y Llywodraeth newydd i gyd-fynd \u00e2 Ewrop, lle mae safonau cemegol wedi diweddaru\u2019r mis diwethaf eu rhestr o halogwyr d\u0175r i gynnwys sylweddau newydd a adnabuwyd sy\u2019n niweidio\u2019r amgylchedd a phobl.<\/a><\/p>\n

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Roedd y ychwanegiadau hyn yn cynnwys nid yn unig rhai PFAS, pesgitsidau a chyffuriau ond am y tro cyntaf, microbrysbiaethau, dangosyddion gwrthsefyll microbaidd, ac ecosystemau d\u0175r tir sensitif. Ar \u00f4l i ni adael yr UE, ni chafodd safonau cemegol wedi’u tynhau yn y gwaith trin d\u0175r gwastraff yn y DU eu mabwysiadu chwaith.<\/p>\n

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Pwy sy’n talu?<\/h3>\n

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Ar \u00f4l arolwg YouGov yn 2025 a gyfeirir mewn adroddiad y Senedd<\/a> ar gemegau yr wythnos diwethaf, gwelwyd, yn ddealladwy, bod 90% o bobl yn y DU yn credu ei bod yn \u2018eithaf pwysig\u2019 rheoli lefelau PFAS mewn bwyd, d\u0175r yfed a’r amgylchedd yn effeithiol.<\/p>\n

Mae’n debyg yn ddiogel tybio eu bod yn teimlo yr un peth am gemegau niweidiol eraill. Ond, pwy sy’n talu am hynny?<\/p>\n

Mae Plaid eisiau cryfhau egwyddor y \u2018sy\u2019n llygru sy\u2019n talu\u2019, ond bydd cymhwyso hynny i safleoedd gwastraff tirlenwi a mwyngloddiau hanesyddol, er enghraifft, a gr\u00ebwyd ddegawdau yn \u00f4l, yn her go iawn.<\/p>\n

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Atal cemegau o’r ffynhonnell<\/h3>\n

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Un o\u2019r prif neges o Bapur Gwyrdd Llywodraeth Cymru ar ddiwygio d\u0175r oedd atal wrth y ffynhonnell. Roedd ganddo thema adlewyrchol mai Cymru ddylai symud i ffwrdd o ddibynnu\u2019n unig ar driniaeth \u2018diwedd pibell\u2019 gan gwmn\u00efau d\u0175r a chanolbwyntio yn hytrach ar atal gwenwynion rhag mynd i\u2019r amgylchedd d\u0175r o\u2019r cychwyn cyntaf.<\/p>\n

Fel Ewropea, bydd hyn yn golygu rheoleiddio tynnach a gwahardd defnyddio cemegau peryglus ar draws pob sector economaidd.<\/p>\n

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Un symudiad annogol diweddar oedd Cymdeithas Ffisegwyr Gwyddorau anifeiliaid Prydain (BVA) yn cynghori yn erbyn defnyddio triniaethau pla gwiddon anifeiliaid yn rhiantol ond sydd yn bennaf yn annhydnaws. Yn aml mae’r rhain yn defnyddio fipronil ac imidacloprid, dau sylwedd sy’n wenwynig iawn i fywyd d\u0175r ac wedi profi eu bod yn achosi llygredd mewn afonydd.<\/p>\n

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Mae’n annhebygol y bydd newid ymddygiadol yn effeithiol ar ei ben ei hun<\/h3>\n

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Mae rhai wedi galw am newid ymddygiad cymdeithasol, i bob un ohonom ofyn a oes angen i ni ddefnyddio cynnyrch cemegol cyn gwneud hynny.<\/p>\n

Ond mae dibynnu ar hynny yn debygol o gymryd rhy hir a gallai fod yn barod i fod yn effeithiol.<\/p>\n

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Un symudiad annogol diweddar oedd Cynghrair Anifeiliaid Clybiau Anifeiliaid Prydain (BVA)<\/a> yn cynghori yn erbyn defnyddio triniaethau pryfyn anifeiliaid anwes fel arfer, sydd yn bennaf yn ddiangen, sy\u2019n cynnwys fipronil ac imidacloprid. Mae\u2019r ddwy sylwedd hyn yn hynod wenwynig i fywyd d\u0175r ac wedi\u2019i brofi eu bod yn achosi llygredd mewn afonydd.<\/p>\n

Mae ban cyfan bellach yn cael ei drafod yn Westminster, rhywbeth y dylid ei gefnogi.<\/p>\n

Mae angen mabwysiadu\u2019r dull hwn hefyd ar gyfer sectorau eraill. Mae padellau nad ydynt yn glynu, er enghraifft, yn ffynhonnell fawr o PFAS ond maent yn dal i gael eu cynhyrchu er gwaethaf cael dewis arall effeithiol.<\/p>\n

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Datganoli pellach i helpu?<\/h3>\n

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Mae\u2019r achos veterinaidd diweddar yn pwysleisio bod rhai o\u2019r materion mwyaf ac argyfyngus sy\u2019n effeithio ar Gymru y tu allan i reolaeth Llywodraeth Cymru.<\/p>\n

Serch hynny, mae cemegion yn yr amgylchedd yn broblem ar draws y DU sydd angen cael ei datrys ar draws pob gwlad ddatganoledig.\u00a0<\/p>\n

Bydd rhoi egwyddorion Atebolrwydd Cynhyrchydd mwy cadarn ar waith angen ychydig o gefnogaeth sylweddol a diddordeb gan San Steffan, ond y cam allweddol cyntaf i Lywodraeth newydd Cymru yw symud ymlaen gyda diwygio d\u0175r.\u00a0<\/p>\n

O leiaf byddai hyn yn arwydd o awydd i ddechrau delio \u00e2\u2019r broblem llygredd cemegol.<\/p>\n

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Cyn y gallwn hyd yn oed ddechrau datrys problem llygredd cemegol Cymru, mae angen inni ddeall maint y broblem…<\/p>\n","protected":false},"author":3,"featured_media":8540,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[61],"tags":[],"class_list":["post-11171","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-newyddion"],"yoast_head":"\nDelio \u00e2 Llygredd Cemegol - Afonydd Cymru<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/afonyddcymru.org\/cy\/llwch-cemegol-llygredig\/\" \/>\n<meta property=\"og:locale\" content=\"cy_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Delio \u00e2 Llygredd Cemegol - Afonydd Cymru\" \/>\n<meta property=\"og:description\" content=\"Cyn y gallwn hyd yn oed ddechrau datrys problem llygredd cemegol Cymru, mae angen inni ddeall maint y broblem...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/afonyddcymru.org\/cy\/llwch-cemegol-llygredig\/\" \/>\n<meta property=\"og:site_name\" content=\"Afonydd Cymru\" \/>\n<meta property=\"article:published_time\" content=\"2026-06-22T14:16:38+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-06-22T14:57:03+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/afonyddcymru.org\/wp-content\/uploads\/2024\/05\/20211114_132924-copy-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2048\" \/>\n\t<meta property=\"og:image:height\" content=\"996\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Seth Johnson-Marshall\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Seth Johnson-Marshall\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"14 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/afonyddcymru.org\\\/cy\\\/llwch-cemegol-llygredig\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/afonyddcymru.org\\\/cy\\\/llwch-cemegol-llygredig\\\/\"},\"author\":{\"name\":\"Seth Johnson-Marshall\",\"@id\":\"https:\\\/\\\/afonyddcymru.org\\\/#\\\/schema\\\/person\\\/672447dc825a9b56eaf0655012248c86\"},\"headline\":\"Delio \u00e2 Llygredd Cemegol\",\"datePublished\":\"2026-06-22T14:16:38+00:00\",\"dateModified\":\"2026-06-22T14:57:03+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/afonyddcymru.org\\\/cy\\\/llwch-cemegol-llygredig\\\/\"},\"wordCount\":2871,\"image\":{\"@id\":\"https:\\\/\\\/afonyddcymru.org\\\/cy\\\/llwch-cemegol-llygredig\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/afonyddcymru.org\\\/wp-content\\\/uploads\\\/2024\\\/05\\\/20211114_132924-copy-scaled.jpg\",\"articleSection\":[\"Newyddion\"],\"inLanguage\":\"cy-GB\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/afonyddcymru.org\\\/cy\\\/llwch-cemegol-llygredig\\\/\",\"url\":\"https:\\\/\\\/afonyddcymru.org\\\/cy\\\/llwch-cemegol-llygredig\\\/\",\"name\":\"Delio \u00e2 Llygredd Cemegol - 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