Leak detection across Gwynedd: the towns we cover
Leak detection coverage includes every Gwynedd LL postcode listed with the towns below.

Non-invasive leak detection
Acoustic, thermal and tracer gas
Trace and access claim reports
Which Gwynedd towns have their own leak detection page?
ADI Leak Detection Gwynedd has a page for each of these towns.
Gwynedd settlement pages set out local housing and landscape details for water enquiries. The list includes Llanberis, Criccieth, Y Bala and smaller villages. Tell the team the locality and explain access to the connection requiring investigation.
Water leak detection for Gwynedd’s smaller settlements brings together places from Bethesda and Pwllheli to Tywyn and Y Bala. The team investigates the affected property’s water connection, circuit or fitting. Use the locality pages to describe the setting, then explain the symptom and the access available.
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Water enquiries among Bethesda’s hillside rows and slate-industry housing.
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Water investigations in Pwllheli, including the historic West End resort setting.
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Concealed-water enquiries in Blaenau Ffestiniog’s slate-industry setting.
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Water and drainage enquiries in Tywyn’s coastal railway setting.
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Water investigations around Dolgellau’s historic terraced buildings.
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Supply and concealed-water enquiries in Porthmadog’s harbour setting.
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Water enquiries in Y Felinheli’s former slate-port setting.
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Water investigations in Y Bala, where the Afon Tryweryn runs through town.
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Ceiling and water enquiries in Barmouth’s seaside settlement.
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Heating and water enquiries in Llanberis, with the National Slate Museum as a local reference.
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Water enquiries in Penygroes within the former slate-quarrying Dyffryn Nantlle area.
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Roof-entry enquiries in Criccieth, beneath its castle and beside the historic town common.
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Supply-loss enquiries in Llanrug, with its river and stone-bridge setting.
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Drainage and water enquiries near Penrhyndeudraeth’s River Dwyryd setting.
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Heating enquiries in Clwt-y-bont’s historic quarry-worker housing setting.
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Water investigations in Nefyn’s maritime settlement, with its former parish church as a historic reference.
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Ceiling enquiries across Harlech’s high-town and low-town setting.
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Water enquiries in Tregarth, including housing associated with slate-quarry workers.
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Water enquiries for Bethel in Gwynedd, with chapel-centred quarry-family housing history.
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Outdoor-water enquiries in Waunfawr’s Gwyrfai valley setting.
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Concealed-water enquiries in Llan Ffestiniog, with older building fabric around the village square.
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Heating and water enquiries among Rachub’s terraces and narrow foot access.
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Water and roof-entry enquiries near Llanbedrog’s Mynydd Tir-y-cwmwd headland.
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Supply enquiries in Groeslon, with its agricultural and slate-mining history.
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Domestic-water enquiries in Bontnewydd beside the Gwyrfai.
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Water enquiries in Dyffryn Ardudwy’s coastal setting beneath Moelfre.
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Heating enquiries in Talysarn’s slate-quarrying Nantlle Valley setting.
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Rainwater-entry enquiries in Tremadog’s planned historic centre.
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Water investigations in Fairbourne, south of the Mawddach estuary.
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Pool and water enquiries in Abersoch, where the Soch reaches the sea.
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Water enquiries in Bryncrug beside the Afon Fathew.
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Water enquiries in Aberdovey’s waterfront and hillside setting.
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Water and roof enquiries where Llwyngwril’s coast meets steep hills.
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Supply enquiries at Morfa Bychan beside its sandy coastal frontage.
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Water enquiries in Tal-y-bont, Gwynedd, on the Cambrian railway route.
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Heating and water enquiries in Trefor below Yr Eifl.
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Water enquiries in Morfa Nefyn’s sandy-beach setting.
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Heating enquiries in Llanllyfni beside the river Llyfni.
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Water enquiries in Llanbedr, with its slate heritage and historic parish church.
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Water enquiries in Llandygai’s nineteenth-century estate-village setting.
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Water investigations in Carmel, Gwynedd, with Victorian and later housing.
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Water enquiries in linear Trawsfynydd beside the A470.
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Supply enquiries in Rhostryfan, with its former railway station as a local reference.
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Water enquiries in Caeathro’s roadside setting on the A4085.
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Water enquiries in Penisa’r Waun’s historic quarry-village setting.
Who fixes a leak on your supply pipe in Gwynedd?
Responsibility for a supply pipe changes at the property boundary. Which water company serves your property depends on your town, and each town page names it, its leak line and its published guidance.
Is leak detection available between the Gwynedd towns?
The Gwynedd county list includes coastal settlements, quarry villages and river-valley communities. Each named page provides its own housing and landscape context. Select the affected locality and give details of the building, concealed connection and observed water loss when contacting the team. Contact the team about your postcode
- LL23
- LL35
- LL36
- LL37
- LL38
- LL40
- LL41
- LL42
- LL43
- LL45
- LL46
- LL48
- LL49
- LL52
- LL53
- LL54
- LL55
- LL56
- LL57
Is leak detection available at your postcode?
Give us your postcode and a technical advisor will confirm the engineer who covers it.
Same or next day depending upon engineer availability.
