Mayo
Water quality for 233 rivers, lakes and coastal waters in Mayo, from EPA and DAERA Water Framework Directive ecological status.
Official classifications in this county
- High
- 28
- Good
- 131
- Moderate
- 61
- Poor
- 13
- Abbeytown, CrossmolinaModerate
- Achadh Ghlaisín, BartrauveGood
- Acorrymore, KeemGood
- Addergoole, BofeenaunGood
- Aghany, LouisburghGood
- Aghinish, CarnaconModerate
- Aille, DooncastleGood
- Aille (Mayo), PartryGood
- Altaconey, OwenduffHigh
- Altnabrocky, BellacorickGood
- An FÁl MÓr, AghleamGood
- An Mullach Rua, An BheairicGood
- An RÁith, DooyorkGood
- Anaderryboy, UrlaurModerate
- Anaffrin, MulrannyGood
- Annies, CarnaconPoor
- Ard, Burrishoole AbbeyGood
- Attiappleton, Ross WestModerate
- Ballaghamuck, BallyglassModerate
- Ballin Mo, KilmeenaModerate
- Ballinapark, BeldergGood
- Ballindine, BallindinePoor
- Ballinglen, BallyglassPoor
- Ballymanagh, KnockanillaunGood
- Ballymore, AttymassModerate
- Bar Deela, BellacorickGood
- Barnynagappul Stream, DugortGood
- Barr Na Coilleadh, CarnhillGood
- Barroosky, BarrooskyGood
- Beagh Beg, ShruleModerate
- Behy (North Mayo), BunnyconnellanModerate
- Bekan, BallyhaunisGood
- Belderg, BelderrigGood
- Bellacragher Bay, OwenduffGood
- Bellagarvaun, ClagganModerate
- Bellanaboy, MuingingaunHigh
- Belmullet Bay, SeanachadhGood
- Beltra, Cluain DamhGood
- Black (Shrule), ShrulePoor
- Black (Sligo), CharlestownGood
- Blacksod Bay, BlacksodHigh
- Blacksod Bay Sw / Achill Sound, SaliaHigh
- Breaghwy, GarranardModerate
- Broadhaven, An Baile GlasGood
- Brusna (North Mayo), BunnyconnellanGood
- Bunanioo, MweewillinGood
- Bunatrahir Bay, GortmoreGood
- Bunnahowna, MulrannyGood
- Bunowen (Louisburgh), LouisburghModerate
- Cabintown, CarrowmoreModerate
- Caheer, BallyhaunisModerate
- Callow, AttimachughGood
- Callow Loughs Stream, FoxfordHigh
- Carra, PartryGood
- Carras, RoundfortGood
- Carroward, BoholaGood
- Carrowbeg (Westport), WestportPoor
- Carrowkeeran, MurriskGood
- Carrowkeribly, AttymassModerate
- Carrowkeribly Lough Stream, AttymassModerate
- Carrowmore, GortmoreGood
- Carrowmore Manulla, ManullaModerate
- Carrownisky, LouisburghModerate
- Cartoon Lough, Killala Bay, RossModerate
- Cartron, Pollranny SweenyPoor
- Castlebar, IslandeadyModerate
- Castlebar, CastlebarModerate
- Castlehill, LahardaunModerate
- Charlestown Stream, LurgaGood
- Claureen (Mayo), ErrewPoor
- Clew Bay, DooghbegHigh
- Cloghan, WestportModerate
- Cloghbrack Stream, FinnyGood
- Clogher Mo, ClogherGood
- Cloonaghmore, GarranardModerate
- Cloonaghmore Estuary, CarnModerate
- Cloonalaghan, CarrowmoreGood
- Cloondaver Stream (North), BallyglassGood
- Clooneen (Mayo), ClooneenPoor
- Cloonkeen, WestportGood
- Cloonlavis, KnockGood
- Clydagh (Castlebar), Ross WestGood
- Coimín an mhása, TonamaceGood
- Cong Canal, FinnyGood
- Conn, TawnaghGood
- Corroy, KnockmoreModerate
- Corryaphuil North, OwenduffHigh
- Corryaphuil South, OwenduffHigh
- Creevy, CastlehillModerate
- Creggan, BallycroyModerate
- Cross, An ChroisModerate
- Cross (Mayo), ToormakeadyGood
- Crumlin (Lough Cullin), Ross WestHigh
- Crumpaun, DerreenModerate
- Cullin, FoxfordModerate
- Cummer (Mayo), UrlaurGood
- Dahybaun, BellacorickHigh
- Deel (Crossmolina), DerreenGood
- Derrew, PartryGood
- Derrycraff, WestportGood
- Derryhick, Ross WestGood
- Derryhillagh, SrahmoreModerate
- Derrynaherriva, BellacorickGood
- Doo Westport, CogaulaGood
- Doobehy, GarranardModerate
- Dooega, DooegaModerate
- Doolough Stream, MuingmorePoor
- Dooniver Loughs, DooniverModerate
- Dooniver Sruhill, DooniverGood
- Dooyeaghny or Cloonloughan, BallinaGood
- Duvowen, GarranardGood
- Erriff, MurriskGood
- Feeagh, SrahmoreGood
- Furnace Lough, Burrishoole AbbeyHigh
- Glenamong, SrahmoreModerate
- Glenamoy, GortleatillaPoor
- Glenawough, FinnyHigh
- Glencastle, GlencastleModerate
- Glencullin (North Mayo), DoonteenyHigh
- Glencullin (West Mayo), Glencullin LowerGood
- Glendarary, CashelGood
- Glenglassera, BelderrigHigh
- Glenisland, GlenislandGood
- Glennanean, MulrannyGood
- Glenree, BunnyconnellanGood
- Glensaul, ToormakeadyGood
- Glore (Mayo), KilkellyModerate
- Gortmore Stream (Mayo), CarrowmoreGood
- Goulaun, SrahmoreGood
- Gowlan (Sligo), CarrownagloghModerate
- Gweedaney, CurraunboyModerate
- Gweestion, BoholaGood
- Hoe, CarrownagloghHigh
- Holan, StradeHigh
- Imleach Beag Thuaidh, Imleach BeagModerate
- Inner Clew Bay, An Cheathru BheagGood
- Islandeady, IslandeadyModerate
- Keel East, KeelGood
- Keel Mo, KeelGood
- Keerglen, BallycastleModerate
- Kilgalligan, CarrowteigeGood
- Killadoon, LouisburghGood
- Killala Bay, RossGood
- Killerduff, DoonteenyGood
- Kilmaine, CrossModerate
- Kiltaclare Stream, KilmoveeGood
- Knappaghbeg, WestportModerate
- Knockboha, RathlackanModerate
- Knocknageeha, CrossModerate
- Leam, Bearanach ThiarGood
- Leckanvy, MurriskGood
- Lee, ShruleHigh
- Lenyvee, CarrownagloghHigh
- Levally, BofeenaunGood
- Lissydaly Stream, UrlaurGood
- Little (Strade), SraheensGood
- Lough Muck Stream, KilmoreGood
- Lough Nacorralea Stream, SrahGood
- Lougherglass, BaraltyGood
- Loughnaminoo Stream, BallaPoor
- Manulla, ManullaPoor
- Mask, ToormakeadyGood
- Mask Upper, FinnyGood
- MeanderHigh
- Mocorha, ShruleGood
- Moher, MurriskGood
- Moyne, KillalaModerate
- Moyour, ClogherGood
- Moyrahan, MoyrahanGood
- Muing, BellacorickGood
- Muingnabo, BaraltyGood
- Muingnahalloona, SrahmoreGood
- Munhin, GortmoreGood
- Murrevagh, DooghbegModerate
- Nacapduff, BoghadoonModerate
- Nagoyne, PartryGood
- Nahaltora, LouisburghGood
- Nanoge, UrlaurGood
- Newport (Mayo), Cluain DamhModerate
- Newport Bay, Burrishoole AbbeyHigh
- North Coolnaha, BallyhaunisModerate
- Oughtagh, GarrahillGood
- Owenaher, CarrownagloghGood
- Owenbrin, FinnyModerate
- Owenduff (Blacksod), OwenduffGood
- Owengarve (Mayo), An Cheathru BheagGood
- Owengarve (Sligo), CloontiaGood
- Owenmore (Mayo), BarrooskyGood
- Owennabrockagh, CuilmoreGood
- Owenwee (Mayo), WestportGood
- Pollagh, DerryvohyGood
- Port Durlainne, PortacloyGood
- Rathmalikeen, RoundfortGood
- Rathroeen Stream, KillalaGood
- Rinn Na Sionnach, GortmelliaGood
- Robe, ClaremorrisPoor
- Rockfleet, An Cheathru BheagHigh
- Roe, UrlaurGood
- Roonagh Lough, LouisburghModerate
- Rosclave, CuilmoreGood
- Scardaun, OwenduffHigh
- Scardaun, BallindineGood
- Shanvolahan, BellacorickGood
- Sheskin Stream, BarrooskyHigh
- Skerdagh, Cluain DamhHigh
- Slieveclaur, KnockanillaunGood
- Sonnagh (Moy), CharlestownGood
- South of Cregganmore, GortleatillaGood
- Spaddagh, SwinfordGood
- Srah Stream, SrahGood
- Srahduggan Stream, OwenduffGood
- Srahmore, SrahmoreGood
- Srahnalong, FinnyGood
- Sruwaddacon Bay, Ross PortGood
- Strade, BallyvaryGood
- Swinford, KilbrideModerate
- Tallagh, BallycroyModerate
- Tarsaghaunmore, OwenduffGood
- Termoncarragh, TonamaceGood
- Trimoge, KilkellyModerate
- Tristia, TristiaGood
- TulachÁn Dubh, TullaghanbaunModerate
- Tullaghan, TullaghanduffModerate
- Tullaghan Bay, TullaghanbaunGood
- Tullaghaunnashammer, TristiaGood
- Tullyegan, BallinaModerate
- Tullymore (Mayo), BallaHigh
- Urlaur, UrlaurModerate
- Washpool, BelcarraGood
- Western Atlantic Seaboard (HAs 32;33;34), DooegaHigh
- Westport Bay, MurriskHigh
- Yellow (Foxford), AttimachughHigh
- Yellow (Knock), KnockGood
These pages show water-quality information, not swim-safety advice. For today’s conditions and swim-safety guidance, check Water Safety Ireland.