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.

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.


Chilterns ANOB

Our 25th Anniversary

We’re pleased to publish the ’25 Years of the Chilterns Chalk Streams Project’ report which summarises project activities, looks at the past and current condition of the Chilterns streams, and sets outs the  future vision for the project.

Recent News

Buckinghamshire Council publishes hard-hitting report on pollution of the County’s rivers and chalk streams

On Tuesday 15th November 2022, Buckinghamshire Council’s Cabinet accepted all the recommendations of a report on pollution in the County’s rivers by its Transport, Environment and Climate Change (TECC) Select Committee.

Joint application made for bathing water status for the River Thames at Wallingford

A joint application to help tackle pollution will lead to a safer swim for swimmers, river users and wildlife in Wallingford.

Chilterns Chalk Stream project appears on ITV Meridian News

Watch again: Professor Kate Heppell of the Chilterns Chalk Streams Project on ITV Meridian News at Ewelme Brook.

Upcoming events

Chilterns ANOB

Guided walk along River chess - celebrating 25 years of the Chilterns Chalk Streams Project

  • 3rd December 2022
  • 10:00

Join Allen Beechey and Wendy Morrison for a guided walk...

Chilterns ANOB

Meades Water Gardens - Chesham Environmental Group

  • 18th December 2022
  • 10:00

Join the Chesham Environmental Group, helping them have a tidy...