The Thames Swim Against Sewage

What’s happening?

This September, a team of 8 world-class swimmers will swim the length of Thames in a non-stop, 200+km, 3-day relay, finishing at the heart of Government in Westminster. The Thames Swim Against Sewage is an epic, first of its kind endurance event to raise awareness of the scale of pollution in our rivers, lakes and seas, calling on the Government to end sewage pollution in the places we love to swim, surf and play.

The event aims to be more than an endurance challenge though – it’s a catalyst to unite and drive change. It will unite world class athletes from England, Scotland, Wales & Northern Ireland with Surfers Against Sewage and the incredible communities & citizen scientists who have been working tirelessly to protect their own stretch of the river. Together we’ll bring community action, hardhitting data and the weight of public support to the front bench at a pivotal moment as MPs return to Parliament.   

Because let’s be clear. Our current water system is well and truly broken. And the time for action is now.

Why now?

In 2024 alone, there were almost a half a million (464,056) sewage discharges across the UK, creating a human health and environmental crisis. And that’s just from the data we have access to. The real number is likely to be more likely just under a million. This isn’t just dirty water. It’s a national scandal that choses profit over its duty to protect people or environment. 

We have a once-in-a-generation opportunity to fix this broken system. An Independent Commission has just made recommendations for the future of the water industry, and the Government is reviewing the very regulations that are supposed to protect us at our bathing waters. The problem? The proposals on the table fall massively short and could even weaken protections, not putting people or the planet first.

As Parliament returns, it’s time to turn up the heat. Water users, communities, and everyday people are demanding change — and we’ll be taking that message straight to the heart of government. Tinkering around the edges won’t cut it. To end the sewage scandal, we need wholesale reform. A new water system that works for people and planet, not profit and power.  

 

Meet our swimmers

A challenge this big needs a formidable team. Our swimmers aren't just athletes; they are directly immersed in the waters we're all fighting to protect. They're uniting from the four corners of the UK to represent a collective call for change.

Calum Maclean - SCOT

Adventurer, open water and ice swimmer

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Calum Maclean - SCOT

Adventurer, open water and ice swimmer

Calum Maclean is an open water and ice swimmer. Out of the water, he uses his adventures in his work as a broadcaster and writer, aiming to encourage more people to get outdoors, more often.

Toby Robinson - ENG

Paris 2024 Olympian and World Championship swimmer

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Toby Robinson - ENG

Paris 2024 Olympian and World Championship swimmer

From Wolverhampton, Toby is a former elite open water swimmer who raced at the Commonwealth Games and the Paris 2024 Olympics. He now serves as the ambassador for the Swimmable Cities Project. Toby is passionate about improving access to clean, swimmable water for communities across the UK.

Amber Keegan - ENG

GBR 2 x World Championship and ultramarathon swimmer

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Amber Keegan - ENG

GBR 2 x World Championship and ultramarathon swimmer

From Sheffield, Amber has represented Great Britain at World Championships in open water swimming. In 2024, she took part in Epic Swim Maui – a UN-backed 220km circumnavigation of Maui for ocean preservation. She’s passionate about ocean health, mental health, and driving change through her platform Athlete Interactions.

Hector Pardoe - WAL

2024 & 2020 Olympian, World medalist

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Hector Pardoe - WAL

2024 & 2020 Olympian, World medalist

From Wrexham, Hector is a two-time Olympian and world championship medalist in open water swimming. He represented Great Britain at both Tokyo 2020 and Paris 2024. Hector is a vocal advocate for ocean health and improved water quality in the UK. Hector also recently completed a 3 lakes challenge, swimming the largest lakes in Scotland, Wales and England in under 24 hours, raising money for SAS.

Daniel Smyth - NI

World Record holding open water swimmer

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Daniel Smyth - NI

World Record holding open water swimmer

From Newry, Daniel became the youngest male to swim across the North Channel. He’s a rising talent in ultra-marathon swimming and is deeply committed to protecting our rivers and oceans for future generations.

Jessika Robson - NI

World Record holding ultramarathon and ice swimmer

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Jessika Robson - NI

World Record holding ultramarathon and ice swimmer

From Anahilt, Jessika is a world-record holding ultra-marathon and ice swimmer. She became the youngest female to swim across the North Channel and has broken multiple British records in the ice. Jessika is passionate about pushing boundaries and inspiring more women into open water swimming.

What are SAS calling for?

We demand legislation that delivers a fair and transparent system which prioritises public health and delivers healthy seas, lakes and rivers for all.   

We need:

  1. Regulations that protects water users whenever, wherever and however they use the water.  
  1. New laws that end pollution for profit and creates a transparent and democratic water system focused on improving public and environmental health. 

Tinkering around the edges won’t cut it. To end the sewage scandal, we need wholesale reform. A new water system that works for people and planet, not profit and power. The time for action is now and we won’t take no for an answer  

How you can get involved

Join the movement to #EndSewagePollution and be part of the fight to reclaim and protect our wild waters from the polluters.  

  • Demand system change – Engage and influence your MP – show them how sewage is impacting your area and just how outraged your community is. Get them to be a champion for new laws to end sewage pollution, once and for all. Don’t know where to get started? Use our email tool to reach out to them today!  
  • Fuel the fightback – Become an SAS Member or donate to help fuel the campaign to end sewage pollution. 
  • Download the free Safer Seas and Rivers App to find out if it’s safe to swim at your local beach, lake or river. If you do get sick, help us hold the water companies to account by submitting a sickness report and let us know how you were using the water, contributing to value data that highlights the scale of the problem.   
  • Apply for Bathing Water Status. Is your local river, lake or beach used by swimmers? We can support you to apply for bathing status which means the water quality will be monitored each week during the bathing season and obligations put in place for polluters to clean their act. 

 

FAQs

The 3-day relay will be taking place from Monday 1st – Thursday 4th September 2025. Kicking off from Lechlade at 12pm on the Monday, the relay swim will take the team on a journey down the River Thames, over 200 km. The event will end at the Houses of Parliament. 

The issue of sewage pollution is UK wide. In 2024 alone, there were an estimated 994,499 sewage discharges across the UK.  People are being made sick, and our waterways are being destroyed. And while our waters are poisoned, shareholders and fat cat CEOs profit. Water companies in England and Wales have handed out £74.2 billion in dividends over the last 35 years. And just this year, they handed out £1.21 billion. Meanwhile, in Scotland and Northern Ireland, the problem is hidden behind poor transparency and patchy monitoring. This system is fundamentally broken. It works only for the profiting polluters and not for us or the planet.  

You can join the movement to #EndSewagePollution in many ways and be part of the fight to reclaim and protect our wild waters from the polluters.  

  • Demand system change – Engage and influence your MP – show them how sewage is impacting your area and just how outraged your community is. Get them to be a champion for new laws to end sewage pollution, once and for all. Don’t know where to get started? Use our email tool to reach out to them today!
  • Fuel the fightback – Become an SAS Member or donate to help fuel the campaign to end sewage pollution.
  • Download the free Safer Seas and Rivers App to find out if it’s safe to swim at your local beach, lake or river. If you do get sick, help us hold the water companies to account by submitting a sickness report and let us know how you were using the water, contributing to value data that highlights the scale of the problem.
     
  • Apply for Bathing Water Status. Is your local river, lake or beach used by swimmers? We can support you to apply for bathing status which means the water quality will be monitored each week during the bathing season and obligations put in place for polluters to clean their act.