Newport leak detection in south Wales
Leak detection in Newport, south Wales, finds hidden leaks in the homes and businesses of the 5 NP districts whose post town is Newport. Cambrian Leak Detection's coverage takes in each of them.
- Newport
- Casnewydd
What separates Newport, south Wales, from Newport in Pembrokeshire?
Newport, south Wales, is separated from Newport in Pembrokeshire by its postcodes: NP10, NP11, NP18, NP19 and NP20 here, against SA42 in Pembrokeshire, and both are covered.
- NP10
- NP11
- NP18
- NP19
- NP20
Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Source: Office for National Statistics licensed under the Open Government Licence v.3.0.
The Pembrokeshire town keeps its own district, SA42, and Cambrian Leak Detection lists it under the SA area with the other covered towns, including Newport in Pembrokeshire. Everything else on this page is about the NP Newport.
What happens when one supply pipe serves a Newport terrace?
When one supply pipe serves a Newport terrace, every house on it shares the responsibility for a leak: Welsh Water says the duty to fix a shared supply is shared across all the properties it serves, and it always recommends a separate pipe for each.
Of the five places with pages on this site, Newport has the largest share of terraced homes: in 2021, 31.1% of households in the Newport council area lived in a terraced house, by the Census count. Where a terrace does take its water through one pipe shared between several houses, Welsh Water calls it a shared supply, and the rules below apply.
If Welsh Water finds that a supply pipe is shared, it talks the repair options through with the owners when it visits. Where a shared supply keeps leaking and nobody repairs it, Welsh Water's legal team can serve a notice requiring the properties to install separate supply pipes within three months.
So the first practical question between neighbours is which length of the shared pipe is leaking, and that is the work of supply pipe leak detection for shared pipes.
Which reservoir supplies Newport's water?
Newport's water comes in part from Llandegfedd Reservoir, which Welsh Water says plays an important role in supplying over 600,000 people in Cardiff, Newport, parts of Monmouth and surrounding areas.
Welsh Water's final water resources plan for 2024 calls Llandegfedd the key low-level reservoir of its South East Wales system. Newport lies in the company's Southeast Wales region, serving people who live mainly in Cardiff, Newport and the South Wales valleys.
From the reservoir to the edge of the street the network is Welsh Water's, and a leak on it is the company's to deal with. A Newport owner's share begins beyond that edge, with the supply pipe the next two sections come back to.
Which leak services apply to a Newport house?
The leak services that apply to a Newport house are the four this site describes: indoor water pipes, the sealed heating circuit, the buried supply pipe, and trace and access work for a home insurance claim.
- Homes in the Newport council area, 2021
- In 2021, Newport council area households lived 31.4% in semi-detached houses, 20.7% in detached houses and 13.5% in purpose-built flats; 62.9% owned their home.
- Dwellings built before 1919
- In the Newport council area, 22.2% of dwellings were built before 1919: 16,120 of 72,490 at 31 March 2026.
Sources: Office for National Statistics, Census 2021 TS044 Accommodation type; Office for National Statistics, Census 2021 TS054 Tenure; Valuation Office Agency, Council Tax: stock of properties, 2026.
Water pipe leaks inside a Newport house
Brown stains, a musty smell or floorboards that warp inside a Newport house can all point to a pipe leaking out of sight.
Heating leak detection
In a Newport terrace, pressure testing shows whether the sealed heating circuit holds, and thermal imaging picks out the warmth escaping hot water leaves in a floor or wall.
Supply pipe leaks along a Newport terrace
On a terrace the pipe to search may be the shared one above, and tracer gas can work up through block paving or tarmac to a detector held over it.
Trace and access for a home insurance claim
Welsh Water says some home policies cover leaks on supply pipes, so a Newport owner whose terrace shares one should check the policy before the search begins.
Can a Newport owner get help from Welsh Water with a supply pipe leak?
Yes, within Welsh Water's limits: an owner who lives in the house can ask about its Leak Support Scheme, which can contribute towards a repair or, where the pipe is shared, towards a new supply pipe with a free reconnection or new connection to Welsh Water's main.
Owners who let the house out, and businesses, cannot use the scheme. Welsh Water will also try to pinpoint a household leak on the external supply pipe when its conditions are met.
Welsh Water's code of practice says owners have a legal responsibility to fix leaks on the supply pipe, and on internal pipework and fittings, within 30 calendar days of the date Welsh Water notifies them of the leak.
Newport is one of the places where Cambrian Leak Detection offers leak detection throughout Wales, and its search works on the owner's side of the street boundary.
A leak in the street itself belongs to Welsh Water, and the place to tell the company about it is its online reporting service.