Leak detection near Caernarfon in Gwynedd
Leak detection near Caernarfon investigates concealed water loss in residential and commercial buildings around this Gwynedd harbour town. ADI Leak Detection Gwynedd arranges visits across the county through head office. Caernarfon has a separate ADI Leak Detection town website for enquiries within the town.
Non-invasive leak detection
Acoustic, thermal and tracer gas
Trace and access claim reports
Which leak investigations cover the Caernarfon area of Gwynedd?
Caernarfon’s harbour and River Seiont place it on Gwynedd’s Menai Strait coast. Around the town, residential streets and waterfront premises present different booking details. Use the verified central district, LL55, and describe the building’s current use, the affected level and any restriction on entering the area containing water services.
Caernarfon’s built-up-area accommodation table records 30.8% semi-detached homes and 35.4% terraces in 2021. These figures describe the wider settlement. For a particular enquiry, explain which rooms have changed since the building was laid out, especially where a bathroom or kitchen now sits above another occupied space.
A Caernarfon ceiling enquiry should identify what occupies the level above the mark, including any separate business or home. The waterfront includes Doc Fictoria and Cei Llechi, with uses that differ from a single household. Set out who holds access to each relevant floor and describe whether the mark changes with rainfall or activity inside the building.
Which places around Caernarfon are in this county guide?
This county guide describes the places and landscape around Caernarfon.
- Caernarfon LL55
Local landmarks and terrain
- Castell Caernarfon
- River Seiont
Who handles supply-pipe leaks around Caernarfon in Gwynedd?
Who owns the private supply pipe?
The property owner owns the private supply pipe between the street boundary and the internal stop tap.
What happens if a private supply pipe serves several properties?
Welsh Water says it will discuss repair options when it finds that a private supply pipe is shared.
Source: Dŵr Cymru Welsh Water guidance, checked 4 November 2026.
Report a leak on Dŵr Cymru Welsh Water's side of the boundary to Dŵr Cymru Welsh Water on 0800 052 0130, 24 hours a day, 7 days a week, or online at dwrcymru.com. Leaks inside the property and on its own supply pipe are the work we do.
Dŵr Cymru Welsh Water is the sewerage company for Caernarfon. Pipes serving more than one property, or serving a single property outside its boundary, are probably Welsh Water’s responsibility. Pipes serving only your property within its boundary are your responsibility.
Source: Dŵr Cymru Welsh Water guidance, checked 4 November 2026.
What should you know about county visits near Caernarfon?
Should I use LL54 or LL55 for a central Caernarfon enquiry?
LL55 is the verified district for the town centre. The broader Caernarfon postal description also includes LL54, so use the district belonging to the premises and include its locality instead of assuming both identify the same area.
Does the age of Tŷ Gwyn establish the age of its pipes?
Research dates the Caernarfon estate to the early 1960s, but that does not date an individual installation. Provide any records of plumbing replacements or altered rooms when discussing water loss there.
How do you book a county visit near Caernarfon?
Send your postcode and a technical advisor calls back to arrange the visit with an engineer who covers Caernarfon.
Same or next day depending upon engineer availability.
