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        • Empower communities to look after their local rivers:

          We mobilise thousands of volunteers every year, working along the riverbank to transform neglected rivers into areas that everyone can use and enjoy.

        • Restore the capital’s network of rivers through the power of nature

          We work to clean and green the capital’s 400-mile network of rivers through innovative solutions to boost biodiversity and restore nature.

        • Build a climate resilient London

          We help to build more engaged communities and healthier rivers better able to adapt to the impacts of climate change, now and into the future.

        • a group volunteers in waders walking through a shallow river on a sunny day using sticks to help them balance
        • Working together to improve our rivers

          We deliver a wide range of projects across London and the Thames Basin to restore, protect and improve our rivers for people and wildlife. Explore some of our key projects and programmes

        • Empower communities to look after their local rivers
          We mobilise thousands of volunteers every year, working along the riverbank to transform neglected rivers into areas that everyone can use and enjoy.

        • Restore the capital’s network of rivers through the power of nature
          We work to clean and green the capital’s 400-mile network of rivers through innovative solutions to boost biodiversity and restore nature.

        • Build a climate resilient London
          We help to build more engaged communities and healthier rivers better able to adapt to the impacts of climate change, now and into the future.

        • Working together to improve our rivers
          We deliver a wide range of projects across London and the Thames Basin to restore, protect and improve our rivers for people and wildlife. Explore some of our key projects and programmes.

        • Improving Rivers
          • Backwater restoration in the Maidenhead to Teddington catchment
          • Bathing waters – Reclaim Our Rivers
          • Cator Park, London Borough of Bromley
          • Understanding our rivers through connecting communities to waterways – Catchment Partnerships
          • Chinbrook Meadows Wetlands – PROJECT COMPLETED
          • Community Action for the Cut – PROJECT COMPLETED
          • Greenwich Natural Flood Management (NFM) Project
          • Marsh Dykes & Thamesmead Catchment Improvement Project
          • Oxford Rivers Project
          • Quaggy Habitats – Capel Manor Project – PROJECT COMPLETED
          • Queensmead Recreation Ground, London Borough of Bromley
          • Rewilding the Rom – PROJECT COMPLETED
          • River Beck Restoration
          • River Biodiversity Net Gain Units
          • Road run-off
          • South Essex Catchment Partnership
          • The River Ravensbourne and Glassmill Pond – PROJECT COMPLETED
        • Connecting Communities
          • Beckenham Place Park East – River Ravensbourne
          • Become a Citizen Scientist
          • Chestnuts Field
          • EMPOWER Rivers
          • Plasticblitz
          • Action for Silk Stream
          • Thames Connections
          • Thames River Watch
          • The Roding Rises
        • Education and Training
          • Citizen Science
            • Leading Action for Healthy Rivers: Thames21’s flagship training course
            • Welsh Harp Environmental Education Centre
        • What we do
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        • London Rivers Week 2026 Photography Competition Winners Video
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River Thames

Volunteers standing on the foreshore.

CANCELLED DUE TO HOT WEATHER – River Litter Detectives – Queenhithe

Book your place HERE! Come along and join Thames21 as a river citizen scientist on the River Thames. We will be collecting the litter we…

London Rivers Week

Photography competition puts focus on upcoming London Rivers Week

A photography competition, called #PictureBlueLondon, has been launched in celebration of London Rivers Week, which runs from October 23-31 – visit our full events list….

Published 4th October 20217th October 2021 Published in Latest news

Volunteers pick 27,000 wet wipes out of the Thames at Battersea

Date of release: September 24 Environmental charity Thames21 has found 27,400 wet wipes on just one site of the river Thames this week. Just under…

Published 24th September 202124th September 2021 Published in Latest news, Media Releases, Thames River Watch

Thames21 raises alarm about river sewage crisis

Thames21 helped raise the alarm about the UK’s river sewage pollution crisis last week – by contributing to a hard-hitting BBC documentary. Thames21 opened last…

Published 19th April 202119th April 2021 Published in Latest news, Thames 21

Obituary of Celia Hensman MBE: Thames21 founder

Celia Hensman was a woman of great charm and conviction, who used her formidable intelligence to create lasting, positive change for people and the natural…

Published 6th January 20215th February 2021 Published in Latest news

Latest river Thames survey confirms COVID-19 plastic impact

COVID-19 driving increase in single-use plastic pollution Date of release: 18 December 2020 London’s largest mass census of river plastic, the annual Thames River Watch…

Published 21st December 20205th January 2021 Published in Latest news, Media Releases

Thames21 volunteering activities update: 7 September

Thames21 StatementSeptember 2020 The safety, health and wellbeing of the public, our volunteers and our staff are of paramount importance to us. Our events and…

Published 17th September 202017th September 2020 Published in Latest news

New project to open up access to the Thames

Thames21 has received funding from City Bridge Trust to deliver an exciting new project, Thames Connections, which aims to make it easier for communities in low-income neighbourhoods…

Published 17th August 202017th August 2020 Published in Latest news

Obituary of Francis Carnwath: First Chairman of Thames21

 “From time to time you can see there are things that can be made to happen” Francis Carnwath CBE Francis Carnwath CBE applied skills, insight and…

Published 28th July 202028th July 2020 Published in Latest news

Hollywood star Zac Efron joins forces with Thames21 to highlight London’s plastic waste crisis

American actor and singer Zac Efron highlights the huge issue of London’s plastic waste problem as part of a new series on Netflix airing in…

Published 8th July 20206th February 2023 Published in Latest news

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  • Five-year action plan launched to improve the River Thames and its tributaries from Maidenhead to Teddington 
    Environmental charity Thames21 and its partners have launched the Maidenhead to Teddington Catchment Action Plan 2026–2031 – a collaborative plan setting out an ambitious vision to restore the Thames and its tributaries between Maidenhead and Teddington. Developed through the Catchment Based Approach (CaBA),...

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Thames21
THAMES21

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Main Office location (& deliveries)

The City of London,
Guildhall,
Aldermanbury Street,
LONDON EC2V 7HH

Postal Address

The City of London,
Guildhall,
PO Box 270,
LONDON EC2P 2EJ

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Satellite Office

Satellite Office: 

The Lock Office,
Bow Locks,
Navigation Road (off Gillender Street),
LONDON E3 3JY

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Registered Charity number: 1103997

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