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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.

        • 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.

        • 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
          • Community Action for the Cut
          • Greenwich Natural Flood Management (NFM) Project
          • Marsh Dykes & Thamesmead Catchment Improvement Project
          • Oxford Rivers Project
          • Quaggy Habitats – Capel Manor Project
          • Queensmead Recreation Ground, London Borough of Bromley
          • Rewilding the Rom
          • River Beck Restoration
          • River Biodiversity Net Gain Units
          • Road run-off
          • South Essex Catchment Partnership
          • The River Ravensbourne and Glassmill Pond
        • 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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Thames River Watch

Volunteers standing on the foreshore.

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…

River Litter Detectives – Broomhouse Dock

Book your place here Come along and join Thames21 as a river citizen scientist on the River Thames. We will collect the litter we find…

River Litter Detectives – Broomhouse Dock

Book your place here Come along and join Thames21 as a river citizen scientist on the River Thames. We will collect the litter we find…

Volunteers standing on the foreshore.

River Litter Detectives – Queenhithe (CANCELLED)

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…

River Litter Detectives – Broomhouse Dock

Book your place here Come along and join Thames21 as a river citizen scientist on the River Thames. We will collect the litter we find…

Volunteers standing on the foreshore.

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…

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

Precious Thames saltmarsh bearing brunt of capital’s plastic tide, latest pollution data finds

Thames21 calls for tougher action on five key plastic items to tackle two-thirds of entire Thames plastic pollution An analysis of citizen science surveys conducted…

Published 30th June 20202nd July 2020 Published in Media Releases

More than 27 000 single-use plastic bottles removed from the Thames in past 12 months

Environmental groups call for action following Thames21’s Big Bottle Count Date of release: 28 October 2019 London’s largest mass census of river plastic, the annual…

Published 28th October 201918th February 2020 Published in Latest news, Media Releases

Thames21 wins prestigious award for its plastic monitoring programme

Thames21’s plastic monitoring citizen science project won a prestigious City award last night, less than a week after it released new data revealing the summer…

Published 26th September 201810th December 2018 Published in Latest news

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Latest News

  • Londoners encouraged to discover their local rivers as festival returns
    Londoners are being encouraged to reconnect with their local rivers as part of this year’s London Rivers Week 2026, marking a decade of connecting people with the capital’s waterways. Running from Saturday 23rd May to Sunday 31st May, the festival, which main theme...

Events Diary

Upcoming Events

Jun 8
2:00 pm - 4:00 pm

River Litter Detectives – Broomhouse Dock

Broomhouse Dock
Jun 24
3:00 pm - 5:00 pm

River Litter Detectives – Queenhithe

Queenhithe, City of London
View Calendar

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Thames21
THAMES21

Address

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

Contact us

Satellite Office

Satellite Office: 

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

Contact us


Registered Charity number: 1103997

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