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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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Citizen Science

Join the Eel Force on Ravensbourne and Brent river catchments

Press Release: June 21 Volunteers are being invited by Thames21 to train to become members of a citizen science Eel Force on the Ravensbourne and…

Published 21st June 202115th July 2021 Published in Media Releases, Thames 21

Lockdown River Resources

We know how much you love your rivers, and how much you’re missing them during lockdown. We’ve been regularly sharing inspiring river-related resources on Facebook, Twitter…

Published 3rd June 202019th January 2021 Published in Blog

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

Thames River Watch recognised in Evening Standard awards

Thames21’s Thames River Watch project was recognised in the Evening Standard Business Awards last night. Tideway, the company building London’s super sewer, won the Corporate…

Published 28th June 201812th July 2018 Published in Latest news, Thames River Watch

Londoners urged to take back their rivers during London Rivers Week 2018

‘Massively increased opportunities’ for Londoners to explore and protect their rivers through collecting key data and joining clean up events Saturday 23 JUNE – Sunday…

Published 18th June 201818th June 2018 Published in Media Releases, Thames 21

Londoners rally to measure plastic’s hidden impact on the Thames

Thousands of wet wipes flushed down toilets are shedding plastic into the river and changing the shape of the riverbed    Date of release: Monday…

Published 26th February 201819th April 2018 Published in Media Releases

Thames21 finds a record 1,300 bottles on one site in one day, in Thamesmead

Communications Manager Ian Lamont reports on a discovery of a huge number of single us plastic bottles in Thamesmead and explains how it fits into…

Published 6th July 201729th November 2017 Published in Blog

Outfall safaris are tackling river pollution – and you can help as a citizen scientist!

Joe Pecorelli, the Zoological Society of London’s Europe Conservation Project Manager, tells us about work running across the capital to prioritise and map sources of…

Published 2nd May 201713th January 2022 Published in Blog

4,500 wet wipes found in one patch of Thames foreshore

Shock findings reveal that the Thames has the highest concentration of wet wipes ever recorded in Britain – with 277 found in just one square metre. Over 4,500…

Published 10th April 20176th February 2023 Published in Latest news

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Latest News

  • Thames21’s response to Thames Water’s pollution incidents
    Recent figures published in The Times have shown that Thames Water was responsible for almost a third of the water sector’s most harmful pollution incidents in 2025. A Thames21 spokesman said: “The scale of serious pollution incidents linked to Thames Water is deeply...

Events Diary

Upcoming Events

Jun 18
11:00 am - 1:00 pm

River Litter Detectives – Poplar Rowing Club

Poplar, Blackwall & District Rowing Club
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

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Registered Charity number: 1103997

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