Drinking water testing in Gwynedd - Aberangell, Aberdaron, Aberdesach, Aberdyfi, Abererch, Abergwyngregyn, Abergynolwyn, Aberllefenni, Abersoch, Afon Wen, Arthog, Bala, Bangor, Barmouth, Beddgelert, Bethania, Bethel, Bethesda, Betws Garmon, Blaenau Ffestiniog, Boduan, Bontddu, Bontnewydd, Botwnnog, Brithdir, Bryncroes, Bryn-Crug, Bwlch-Derwin, Bwlchtocyn, Caeathro, Caerhun, Caernarfon, Capel Curig, Carmel, Chwilog, Clynnog Fawr, Clwt-y-Bont, Corris Uchaf, Corris, Criccieth, Croesor, Cwm y Glo, Deiniolen, Dinas Dinlle, Dinas Mawddwy, Dinas, Dinorwig, Dolgellau, Dolmelinllyn, Edern, Efailnewydd, Esgairgeiliog, Fairbourne, Friog, Ganllwyd, Garndolbenmaen, Gellilydan, Glasinfryn, Groeslon, Harlech, Llanaber, Llanaelhaern, Llanbedr, Llandbedrgoch, Llanbedrog, Llanberis, Llandanwg, Llanegryn, Llandegwning, Llandeiniolen, Llandwrog, Llanelltyd, Llanengan, Llanfair, Cwm Pennant, Llangwnnadl, Llan Festiniog, Mallwyd, Maentwrog, Minffordd, Morfa Nefyn, Mynydd Llandegai, Mynytho, Nantlle, Nantmoor, Nasareth, Nebo, Nefyn, Pant Glas, Penffridd, Penmaenpool, Pennal, Penrhos, Pentre Gwynfryn, Penygroes, Pistyll, Pontllyfni, Pontrug, Porth Dinllaen, Porthmadog, Portmeirion, Prenteg, Pwllheli,Rachub, Rhiw, Rhiwddolion, Rhiwls, Rhosgadfan, Rhostryfan, Rhoshirwaun, Rhoslefair, Rhyd Ddu, Rhyd-y-Clafdy, Rhos-y-Gwaliau, Sarn Meyllteyrn, Tal-y-Bont, Talysarn, Trawsfynydd, Trefor Tregarth, Tremadog, Tudweiliog, Tywyn, Talsarnau, Uchmynydd, Waunfawr, Y Felinheli, Y For, and more.