Wrexham leak detection where Hafren Dyfrdwy supplies the water

Which postcodes mark out Wrexham?

The postcodes that mark out Wrexham are LL11, LL12, LL13 and LL14, the districts whose post town is Wrexham.

• LL11
• LL12
• LL13
• LL14

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.

Llangollen, Ruthin, Mold, Buckley and Deeside lie around them under post towns of their own, and Cambrian Leak Detection covers those too, among the covered towns in north-east Wales.

Why is Wrexham's water supply handled differently?

Wrexham's water supply is handled differently because Hafren Dyfrdwy supplies water to its customers in Wrexham, with its own rules on pipes, while Welsh Water provides wastewater services there.

Hafren Dyfrdwy looks after its mains and assets, normally found in the road or footpath, and its responsibility for the supply runs up to and including its controlling external stop tap, normally at the property boundary, although that isn't always the case. If that stop tap sits inside the property boundary, the company owns the pipe from the street up to it and the owner owns the rest of the pipe to the home.

Welsh Water draws the owner's line somewhere else, normally at the street boundary. Two owners, one on each company's water, can therefore be responsible for different lengths of pipe.

By law, Hafren Dyfrdwy says, the owner of a property maintains the private pipes that supply its water, inside and outside the property. Where neighbours share a supply pipe, everyone downstream of a leak is responsible for getting it sorted.

Anyone unsure whether their home is on Hafren Dyfrdwy water can start with the company's Our supply area page, which asks people living close to its boundary to get in touch. Cambrian Leak Detection's supply pipe page sets out the supply pipe rules for both Welsh water companies.

Which river supplies Wrexham's tap water?

The River Dee supplies Wrexham's tap water: in its draft water resources plan, Hafren Dyfrdwy names Llwyn Onn on the Dee as the major source of its Wrexham water resource zone, and says around 61% of the company's raw water comes from the river.

That plan is Hafren Dyfrdwy's draft of 2022. Across the company as a whole, the rest of the raw water comes 5% from impounding reservoirs, which it names as Pendinas, Cyfynwy, Nant y Ffrith and Penycae, 30% from boreholes and 4% from a spring.

The Dee itself is run under rules prepared with the advice of the Dee Consultative Committee, which Natural Resources Wales chairs.

Wherever the water starts, Hafren Dyfrdwy's pipes end at its external stop tap, and a leak on the house side of it is for the Wrexham owner to have found and fixed.

Which leak investigations are offered across Wrexham?

The leak investigations offered across Wrexham cover four kinds of hidden leak: those on the water pipes indoors, in the central heating circuit and along the underground supply pipe, and the trace and access search an insurance claim may need.

Detached and semi-detached houses make up much of Wrexham's housing, and social renting is more common in the council area than in the other four places with pages here, as the panel sets out.

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.

What does Hafren Dyfrdwy ask of a Wrexham owner once a leak is confirmed?

Hafren Dyfrdwy asks a Wrexham owner to fix leaks on their private pipes promptly, because by law the owner maintains the pipes that supply the property, and it can offer domestic customers it has written to about a leak a free repair, subject to conditions.

Its reason for asking is to avoid damage and high bills, and it says older pipes may need replacing to stop the problems coming back. For the work itself it points owners to approved plumber lists: WaterSafe for internal work and WaterMark for external work.

If a leak at home has affected the bill, Hafren Dyfrdwy says it may be able to help with the cost. Once the leak is fixed it reviews the claim to see whether it can cover some or all of the water lost, depending on how long it was leaking, and its Leakage allowance page holds the detail.

Cambrian Leak Detection finds the leak before any of that, and the home page covers its leak detection elsewhere in Wales.

A leak on Hafren Dyfrdwy's side, including one spotted while out and about, should be reported to the company: it asks people to check the latest updates for their area first and then use its Report a problem page.