Chalk streams are a characteristic and attractive feature of the Chilterns landscape. They are also a globally rare habitat. In fact there are only 283 chalk streams in the UK, and the UK accounts for around 85% of the global total.
Chalk streams are important habitats for wildlife and support a massive range of species. They are home to some of our most threatened plants and animals, such as the water vole and brown trout. They also have a fascinating history and supported many thriving industries in the past.
Our three films provide an excellent overview, explaining ‘What are chalk streams, and why are they special‘, How chalk streams work, and exploring the threats they face.
The nine Chilterns’ chalk streams are so important that a special partnership project has been created to conserve them. Uniting all the organisations with an interest in the streams, the Chilterns Chalk Streams Project works with local people across the Chilterns to improve river habitats, improve access and enjoyment and promote the sustainable use of water.
Find out more
Visit
There are plenty of ways to get out and enjoy the Chilterns chalk streams for yourself.
Discover
What is a chalk stream, how do they work, and what makes them so special?
Learning
School visit information and educational chalk stream resources for primary, secondary and beyond.
Chalk Streams in Crisis
Despite the rarity and value of chalk streams, these precious and unique freshwater ecosystems are at risk.
Our Work
For 25 years the Chilterns Chalk Streams Project has worked to conserve, enhance and raise awareness of this globally important habitat.
Get involved
If you love your local chalk stream then why not help look after it?

River Chess Smarter Water Catchment
This ground-breaking initiative brings together key organisations and community groups to address issues on a catchment scale and aims to restore one of the Chilterns’ finest chalk streams to health. The Chilterns Chalk Streams project is a key partner in this initiative.
Recent News
Love Exploring? Try our new guided family trail
Chiltern Chalk Streams have teamed up with Bucks Council and Love Exploring to create a new fun guided trail along...
Rivers Week: how did it go?
During Rivers Week (18th and 24th September), our team were out and about across the Chilterns involved in a variety...
Rivers Week in the Chilterns
Organisations from around the Chilterns are planning events to celebrate Rivers Week between 18-24 September.
Events

Teacher Training Workshop: Investigating the River Chess
- Monday 22nd January
- 4pm
This twilight session introduces a set of KS4 & 5...
