​​​About the upgrade
We’re delivering a major upgrade to the drainage network in St Peter’s Village to meet current and future demands.
The upgrade is split into 2 key projects:
- Sewer Network Upgrades, from July 2025 to March 2026
- Strategic Storage Tank, from September 2025 to early 2027
Why it’s needed
As Jersey grows, so does the demand on its infrastructure.
With new homes being built and heavier rainfall linked to climate change, our drainage systems must evolve to cope. In St Peter’s Village, the existing sewer network is already operating at full capacity. To protect homes, businesses, and the environment, the Government of Jersey’s Infrastructure and Environment department is delivering a major upgrade to the area’s drainage network.
This will support planned and future development, reduce flood risk, and build resilience into our wider Island infrastructure.
Benefits for St Peter’s and the Island
This upgrade in St Peter is part of a broader commitment to ensuring our Island is protected, connected and prepared for the decades ahead.
Benefits include:
- investment in long-term Island infrastructure, strengthening services that benefit all Islanders
- support for housing and infrastructure growth, enabling sustainable development without compromising public services
- reduced risk of flooding, protecting properties, public spaces and the natural environment
Project details
Sewer Network Upgrades Project (July 2025 to March 2026)
The existing foul water sewers will be replaced with larger diameter pipes to accommodate increased flows. This will ensure that the system can serve current and future demands.
Full road closures will be required during construction because the existing pipes are buried beneath the centreline of roads. To minimise disruption, the project will be delivered in carefully planned phases.
Access for residents and businesses will be maintained throughout.
Map showing the phases of the Sewer Network Upgrades Project
Strategic Storage Tank Project (September 2025 to early 2027)
A new underground tank will be constructed to temporarily store combined sewer flow during periods of heavy rainfall. This will help prevent surface flooding and pollution incidents into the environment.
The 6,100-metre cubed tank will connect to the drainage network downstream of the planned upgrades. It’ll store excess flows and release them safely once capacity returns. Construction will take place in field P765 and connect into the existing system via La Rue de St Clement.
We’ll continue to provide regular updates to the neighbouring properties of Field P765.
Schedule of work for the sewer network upgrades
We’ll update the information on this page as the work progresses, and key milestones are achieved.
Phase 1 La Grande Route de Saint-Pierre | 21 July to 11 August 2025 | Lane closure, with temporary traffic lights between Philadelphie Church and the Marks and Spencer entrance. |
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Phase 2 La Rue de Fosses | 8 August to 9 September 2025 | Road closure, with access maintained as far as the St Peter's Youth and Community Centre car park. |
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Phase 3 La Rue de L'Eglise | 20 August to 4 September 2025 | Road closure, between the junction with La Petite Rue de l'Eglise and La Grande Route de Saint-Pierre. Access to Co-op will be maintained via diverted routes. |
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Phase 4 La Petite Rue de L'Eglise | 4 September to 20 October 2025 | Road closure, with access to the car park behind the Sir George de Carteret Pub maintained via diverted routes. |
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Phase 5 La Grande Route de Saint-Pierre | 9 October 2025 to 19 March 2026 | Road closure from the junction with La Petite Rue de l'Eglise up to St Peter's Technical Park (by Marks and Spencer). The road closure will be carried out in short sections, with the extent of working area moving along the road as works are completed. |
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Phase 6 La Route de Beaumont | 4 March to 19 March 2026 | Lane closure with temporary traffic lights between the junction with La Rue de L'Eglise to the junction with La Rue de St Clement.
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Diversion routes
Diversion routes will be in place during the Sewer Network Upgrades Project​ when there are full road closures.
Maps of the diversion routes will be available on this page from August 2025.
You’ll be able to view printed copies of the traffic management plans and the areas of work at St Peter’s Parish Hall from August 2025.
Access
Access to all businesses, car parks and residential properties in the surrounding area will be maintained during the works.
Bus
Bus route diversions will be advertised on
Liberty Bus​ closer to the time of the planned works.
Contact information
If you have any questions contact our project team by email at
LWCapitalDelivery@gov.je or call +44 (0) 1534 445509.​
gov.je