Reporting pollution or environmental problems

If you’ve spotted pollution or an environmental problem on a waterway, please report it directly to the Environment Agency via GOV.UK or call their 24/7 incident hotline on 0800 80 70 60.

A volunteer working in the river, creating a berm (a system of logs and twigs) to slow the flow of water and planting iris between.

Wandle Fortnight 2026

Join us for Wandle Fortnight, 12–27 September, and discover ways to get closer to this special south London chalk stream.

From 12–27 September 2026, Wandle Fortnight brings communities together to celebrate the River Wandle and the places, wildlife and people connected by it. Join the South East Rivers Trust this September and help us care for this special south London river. From rolling up your sleeves at a river restoration event to discovering how we’re working with partners to create a healthier, better-connected river corridor, there are plenty of ways to get closer to the Wandle this September.

What is Wandle Fortnight?

Wandle Fortnight is an annual celebration of the River Wandle and the communities that surround it.

For two weeks, organisations and community groups across the Wandle Valley run activities that help people discover its wildlife, heritage and green spaces.

The River Wandle flows through Croydon, Sutton, Merton and Wandsworth before joining the Thames. Despite flowing through one of the most urban parts of the country, it is a rare chalk stream and an important corridor for wildlife and people.

This Wandle Fortnight, we’re inviting local people to get involved in caring for the river while sharing some of the work happening to create a healthier Wandle for the future.

A group of people standing in a river clearing vegetation from the riverbank.

Help restore the river at Culvers Avenue

Join the South East Rivers Trust’s river restoration volunteers and help us improve this stretch of the River Wandle.

Our work at Culvers Avenue is helping to create a more natural, varied river where wildlife can thrive. During Wandle Fortnight, you can get directly involved and see river restoration in action.

No previous experience is needed. Our team will provide guidance, equipment and everything you need to take part.

Book your place at Culvers Avenue
A volunteer working in the river, creating a berm (a system of logs and twigs) to slow the flow of water and planting iris between.

Volunteer with us at Morden Hall Park

We’re also joining forces with the National Trust and its volunteers at Morden Hall Park, where the River Wandle winds through wetlands, meadows and historic parkland.

Together, we’ll be giving this important stretch of river some hands-on care and helping improve its habitats for wildlife.

Morden Hall Park sits at the heart of the Wandle Valley and provides valuable wetland and riverside habitats within urban south London.

Book your place at Morden Hall Park

Creating a greener corridor along the Wandle

The River Wandle is a 23.5km chalk stream flowing through Croydon, Sutton, Merton and Wandsworth before joining the Thames.

Along its route, the river connects a ribbon of parks, green spaces and the Wandle Trail, creating an important corridor for both wildlife and people. Together, these spaces form the Wandle Valley Regional Park.

The South East Rivers Trust is one of the partners involved in a wider programme to help strengthen these connections.

With £650,000 of funding from the Mayor of London, the National Trust is working with the London Boroughs of Croydon, Sutton, Merton and Wandsworth, the Walk Wheel Cycle Trust, the South East Rivers Trust, Living Proof, Wandle Valley Forum, the Environment Agency and Wandle Valley Regional Park Trust.

Together, the partnership is working to:

  • enhance the Wandle Trail
  • improve access to the River Wandle and its connected green spaces
  • engage local communities and young people
  • help shape a long-term vision and plan for the Wandle Valley Regional Park

For the South East Rivers Trust, this work connects closely with our wider aim to create healthier, better-connected river habitats across the Wandle catchment.

The Wandle supports rare chalk stream habitat and species including brown trout and kingfishers, while its parks and riverside spaces give people valuable opportunities to experience nature in the heart of south London.

Wandle Fortnight is a chance to celebrate that bigger picture: bringing together river restoration, access, green spaces and community involvement to help create a healthier Wandle corridor for the future.

The River Wandle with reeds in the foreground and green trees either side.

Why the Wandle needs our help

The River Wandle has undergone an extraordinary transformation.

Once heavily modified and affected by industry, decades of restoration have helped wildlife return and improved many stretches of the river. But the Wandle still faces pressure from pollution, urban development, modified river channels and the effects of climate change.

We work with communities and partners across the catchment to restore more natural river habitats, improve connectivity, increase resilience and help people play an active part in looking after their local river.

Discover our work on the Wandle