IN Brief:
- United Utilities confirmed on 15 October that the Peel Green Road sewer is connected to the existing network and operating.
- Tunnelling was completed in May 2026, with the network connection and operational commissioning achieved later in October.
- The continuing £300m Eccles investment is separate in scope from more than £525m planned across the wider Salford area.
United Utilities has connected the new Peel Green Road sewer in Eccles to the existing wastewater network and confirmed that it is fully operational. Wastewater is flowing through the additional pipework to Eccles wastewater treatment works, and the road has reopened. The 15 October milestone establishes commissioning of the sewer connection, not completion of the continuing treatment works upgrade or a quantified improvement in flood and spill performance.
Tunnelling beneath Peel Green Road was completed in May 2026 after specialist equipment installed the additional sewer. United Utilities said at that point that further works would be needed to connect the pipe to the live wastewater system and bring it into use. Those connection activities took place later in the year, with the October release confirming that the asset is now operating. Finishing the tunnel drive and commissioning the connected sewer are separate construction milestones.
A buried wastewater network depends on more than the installation of an isolated length of pipe. To function, new pipework must connect to existing assets so that flows can enter and leave the upgraded section. Interfaces between new and existing sewers also require control of the construction area, access to buried services and arrangements that protect the operation of the wider system. The company has confirmed the new sewer is in use, but has not disclosed its diameter, length, depth or a measured increase in hydraulic capacity.
The underground route presented practical construction difficulties. United Utilities has said that utilities and structures encountered below Peel Green Road were not always in the positions shown on service records. Those discrepancies contributed to the extension of an earlier road closure. In a constrained street corridor, differences between drawings and actual asset positions can affect excavation, the alignment of trenchless equipment, temporary support and protection of other services. The precise adjustments made at each obstruction have not been published.
Using specialist tunnelling plant can limit the length of road that must be opened for pipe installation, although it does not remove the need for launch and reception areas or connections at the ends of a new section. The method also depends on accurate information about the route and subsurface conditions. United Utilities has identified tunnelling as the method used for the Peel Green Road installation, but has not specified the type of boring machine or provided performance data that would support a claim about excavation volume avoided.
Completion of a trenchless installation does not by itself make a new sewer operational. In May, United Utilities reported the end of tunnelling but said network connections still lay ahead; its October announcement records that these links have been made and wastewater is now conveyed to the works. That distinction is important in an existing operational network where the new pipe must work with receiving assets rather than simply remain an installed but isolated section.
The additional sewer is intended to increase resilience during periods of heavy rainfall, when runoff can increase volumes entering combined wastewater networks. Its actual effect depends on the hydraulics of the connected pipework and downstream treatment arrangements. United Utilities has not published verified bore dimensions, installed sewer length, a quantified flood-risk reduction or measured reductions in storm overflow spills attributable to the Peel Green Road connection.
Eccles wastewater treatment works remains the focus of a further major construction phase. United Utilities is progressing additional stormwater storage and treatment-process upgrades intended to capture excess flows during heavy rain and return them for treatment later. Those assets are separate from the newly commissioned conveyance connection and are not established as fully operational by the October sewer announcement.
A sewer carries wastewater to another point in the network, whereas storm storage provides temporary capacity when incoming flows exceed the rate that treatment facilities can accommodate. Water held during those periods can subsequently be passed through the works, potentially reducing untreated storm discharges once the new storage and treatment systems are commissioned. No verified post-upgrade spill figures or capacity gains have yet been published for the combined Eccles programme.
United Utilities puts the wider Eccles investment programme at approximately £300m, covering the operational sewer connection and further treatment works and resilience measures. In its May announcement, it separately described more than £525m of sewer network and water-quality investment across Salford over four years, including other locations and projects. Those numbers have different geographical scopes and cannot be added together or described as competing estimates for the Peel Green Road sewer’s cost.
The programme also includes improvements to the treatment of wastewater before it is discharged to the receiving environment. Better treatment capability and more effective management of storm flows address different aspects of the system: one concerns the quality of water leaving the works, while the other concerns how often high flows exceed normal treatment arrangements. Results will depend on commissioning and operation of the subsequent works, not solely on completion of the street sewer.
Peel Green Road reopened after tunnelling was completed in May, with further lane restrictions anticipated for the connections later in the year. United Utilities confirmed on 15 October that the road was fully reopened following those works. No measured traffic-impact assessment or reinstatement specification has been published. The latest reopening is an access milestone, separate from any long-term hydraulic performance claims about the wider Eccles wastewater network.
United Utilities delivery manager Jim Scholes said the immediate focus has shifted to the continuing programme at Eccles wastewater treatment works. The October commissioning enables wastewater to flow through the new Peel Green Road connection, while further storage and treatment measures are still being delivered. Any eventual reduction in flood risk, storm overflow frequency or wastewater discharge impacts must be evaluated against system performance rather than inferred from completion of the pipe connection alone.
