Welsh Water said the tunnelling work, which was originally due to finish in April 2025, is now expected to resume in autumn 2026 after it was paused last September
A controversial sewage system which has faced a string of delays will not be finished for at least another nine months after an equipment problem has caused fresh delays. Welsh Water said the lack of availability of machinery meant work had been unable to resume since it paused last September.
The pumping station at Llandaff North’s Hailey Park has long been a contentious issue which has caused friction between local residents and Welsh Water. Residents, community groups, park users, and councillors have long raised concerns over potential bad smells, noise levels, and effects on biodiversity.
Plans were first approved in 2022. However, in 2023 campaigners lost a legal challenge against the development after they raised thousands of pounds to contest the development, saying it should have faced more scrutiny.
The purpose of the pumping station is to meet the increased sewage demands created as a result of the Plasdwr housing development on the outskirts of Radyr. Never miss a Cardiff story by signing up to our daily newsletter here.
The station will pump sewage that’s travelled from the Plasdwr housing development, across the River Taff, up to the level of an existing sewage system where it will then be transported to Cardiff Wastewater Treatment Works.
Since the green light was given for the development to go ahead, there has been a number of issues with the tunnelling process. This is the method used to install sewers underground.
In the original timeline, tunnelling work was supposed to run from October 2024 to April 2025, before the restoration of field and landscaping of the field which was supposed to see the project finished in 2026. The water supplier then pushed the timeline back for tunnelling to start around February 2025.
Work eventually got underway, but fresh problems arose in September 2025 when Welsh Water said the work had been delayed “due to unforeseen circumstances”.
They explained that water had caused significant flooding and damage to the tunnel-boring machine which was being used on the new sewer pipeline.
Work had then been due to resume earlier this year after Welsh Water had a Section 61 application approved to allow them to complete 24-hour tunnelling work during a five-week period. Concerns were raised at the time about noise and light pollution when work was carried out during the night.
At the time, Steph Wilkins, the chair of Llandaff North Residents’ Association, said there was a lack of trust within the community that the work would actually be completed on time.
However, Welsh Water has now confirmed that although the work had been due to resume earlier this year, the availability of the “essential machinery and specialist resource” needed to carry it out meant the tunnelling had remained on hold.
Instead, they said they anticipate the work will resume in the autumn, around a year after it was first paused, and said they would provide a timeline for the remainder of the work when that begins.
Ian Vincent, from Whitchurch, who was heavily involved in the legal challenge, said it felt like the development was going backwards rather than forwards.
He said: “They are about two years behind schedule now and they’ve constructed the shaft but haven’t really started tunnelling at all because it flooded.”
Ian said the delays were having a terrible impact on the community, especially in the summer months when part of the park is inaccessible.
He continued: “The delays are having a terrible impact on the community. A big section of Hailey Park, a beautiful Green Flag park, is just completely out of bounds, there’s a horrible massive compound there.
“Of course it’s summer now and people should be over there and enjoying the park but instead it’s just a blot on the landscape. It’s a horrible thing and people just want to know what’s going on.”
A Welsh Water spokesperson said: “We were planning to resume our tunnelling work in Hailey Park earlier this year. However, due to the availability of essential machinery and specialist resource needed by our contractor to carry out the work, our tunnelling activities remain on hold.
“We now expect activity to resume in Autumn 2026, when we will also be able to provide a timeline for the remainder of our work and reinstatement.
“We apologise for the delay and thank the community for their patience and understanding during this time.”
Llandaff North Labour said the overall estimated completion date on the project has now been updated to March 2027 – which would be two years delayed – but Welsh Water said they would provide a timeline for the rest of the work once tunnelling resumes.

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