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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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        • London Rivers Week 2026 Photography Competition Winners Video
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River Ravensbourne

Chinbrook Meadows Maintenance Days

This is an event designed for the community to engage the local public with the river and not for corporates. If you are interested in…

The group who trained for the Ravensbourne Outfall Safaris

Pollution and grumpy golfers: Adventures of the 2017 Ravensbourne Outfall Safari

Outfall Safaris, carried out by volunteers,  are a scheme to identify pollution in rivers caused when property drains are misconnected or cross connected. Here, Lawrence…

Published 21st November 2017 Published in Blog

Volunteer for new Outfall Safaris on the Ravensbourne & Ingrebourne

Would you like to help identify where misconnected drains are polluting rivers? Thames21, under the guidance of the Zoological Society of London, is offering the public the chance to…

Published 26th July 201716th October 2017 Published in Latest news
Chris Stafford

Obituary: Thames21 marks the death of Chris Stafford, a long-term volunteer and friend

Chris Stafford 1957-2017 With the three-week 3 Rivers Clean Up beginning this weekend across the Ravensbourne, Pool and Quaggy, catchment partnership officer Lawrence Beale-Collins mourns a well known volunteer…

Published 31st May 201716th October 2017 Published in Latest news

Ninth annual 3 Rivers Clean Up to focus on plastic awareness as well as blitz on balsam

PRESS RELEASE Date of release: May 19 2017 The damage plastic is causing to the environment, particularly waterways, will be one of the themes of the…

Published 19th May 2017 Published in Media Releases

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

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...

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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

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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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