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The CLEAN Afon Nyfer project (Catchment Level Environmental Action Network) works with local people to monitor water quality, invasive species and the health of the river, and to come together to find ways to address the issues.


The Afon Nyfer (River Nevern) is a river of refuge for wildlife; linking the open habitats of the Preselis and the temperate rainforest of North Pembrokeshire with a marine conservation area.


It is a catchment which tragically follows the trend across Britain of declining biodiversity due to pollution and disruption of natural processes. However, it is not as badly affected as many other rivers and offers an opportunity to demonstrate how to halt and reverse that trend, before it is too late!

We have published our baseline data in several reports which you can view here, and are starting to understand which areas are most heavily impacted.  

We are about to launch our next phase of the project, involving as many people as possible in the future of the river and designing practical solutions to the problems observed. 

If you are keen to know more about this project, or are interested about how you could be involved, contact the team. 



Himalayan Balsam removal day is coming up as part of the Nyfer am Byth project's work on the Afon Nyfer with The West Wales Rivers Trust's Adopt a Tributary initiative.

When: Tuesday 23rd July

10am - 2pm with stops for cake and lunch (you do not feel obliged to stay all day.)

Where: Brynberian (more details to follow)

Come and help us continue the fight against one of our least favourite invasive plants.

Please bring:

Long sleeve trousers and tops

Sturdy footwear

Gardening gloves if you have your own

If you are interested please email Emma Withers, Adopt a Tributary Officer for Pembrokeshire -

Blog posts from the CLEAN Project

Some suggested links to websites worth checking out:

Dwr Cymru Combined Storm Overflows Explanation of CSOs and duration of sewage dumping into the rivers.


The Rivers Trust Raw Sewage In Our Rivers Explanation of raw sewage and further links.


River Action UK Charter For Rivers and other campaigning and lobbying.


Fresh Water Watch citizen science to monitor water quality.


Farming Connect riparian buffers on farms.


Save The Tefi links and resources from an adjacent catchment. 

Mae'r prosiect hwn wedi derbyn cyllid drwy'r 'Grant Gwella Sir Benfro'.

This project has received funding through the 'Enhancing Pembrokeshire Grant'. 

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