Reducing agricultural pressures on freshwater ecosystems

DOI: https://doi.org/10.58248/PN661 

Freshwater environments and the benefits that they provide, such as clean and plentiful water, are being impacted by human activity, with agriculture and sewage effluent the leading causes of English rivers not meeting good ecological status. Agriculture affects more than 60% of these failing rivers, with sewage effluent affecting over half. Agricultural issues include use of high levels of nutrients which are applied to land as fertilisers and manures, as well as eroded soil and pesticides, herbicides and fungicides entering watercourses. Such pollution from multiple agricultural sources is problematic as it is difficult to trace and attribute.  

Evidence shows that poor understanding by farmers of existing regulation contributes to low compliance with policy interventions. In addition, despite the inter-connectedness of freshwater ecosystems, monitoring has focussed on large rivers and lakes, historically ignoring smaller freshwater bodies that drain into or connect them. As part of a ‘systems’ approach, all components of a water catchment need to be included in the evidence base.

Government legislation proposes a move beyond the fragmentary policy of the past to a “systems” approach. This will deliver environmental improvements and mitigate the pressures faced by freshwater ecosystems. The UK has different types of catchments that contain diverse freshwater habitats and a systems approach will require consideration of the range of these ecosystems and  the multiple pressures facing them. Water catchments do not recognise governance boundaries which makes their integrated management difficult, but a polycentric governance approach, where information is shared in all directions (neither top-down nor bottom-up) could develop a more inclusive decision-making framework.  

Key points: 

• Fragmented policy approaches have failed to reverse the impairment of England’s freshwater ecosystems: just 14% of rivers are classified as in a good ecological state.  
• Livestock and soil management, including manure and fertiliser use, are the leading agricultural activities affecting freshwater ecosystems.  
• Previous water monitoring has focussed on large water bodies, with significant evidence gaps for headwater streams and smaller freshwater bodies. 
• Defra are funding habitat restoration on farmland under recently announced initiatives. In appropriate locations this could restore water quality and provide other environmental benefits.   
• Addressing these pressures will require clear targets, further actions, better communication and knowledge sharing and co-ordinated payments to farmers.  

Acknowledgements 

POSTnotes are based on literature reviews and interviews with a range of stakeholders and are externally peer-reviewed. POST would like to thank interviewees and peer reviewers for kindly giving up their time during the preparation of this briefing, including: 

Dr Fay Couceiro, University of Portsmouth

Professor Penny Johnes, University of Bristol*

Dr Matt Ascot, British Geological Survey

Professor Helen Jarvie, University of Waterloo, Canada*

Professor Steve Ormerod, University of Cardiff*

Professor Nick Voulvoulis, Imperial College London

Bob Harris, University of Sheffield

Professor Ian Holman, Cranfield*

Dr Linda May, Centre for Ecology and Hydrology

Professor Edward Maltby, University of Liverpool

Professor Adie Collins, Rothamsted Research

Professor Sean Comber, Plymouth University*

Dr Flemming Gertz, SEGES, Denmark

Arlin Rickard, The Rivers Trust

Charles Watson, River Action UK

Dave Ashford, Brecon Beacons Mega Catchment

Caroline Drummond, Linking Environment and Farming

David Johnson, Catchment-based Approach and The Rivers Trust*

David Smith, Upstream Thinking, South West Water*

Ian Ludgate, NFU*

Sarah Blanford, Sainsbury’s Supermarkets Ltd.

Rebecca Hesketh, Waitrose & Partners

Benjamin Thomas, Waitrose & Partners

Loraiza Davies, Waitrose & Partners

Phil Smith, Environment Agency*

James Price, Perdiswell Farm

Tom Curtis, 3Keel

Stuart Clarke, National Trust*

POST Board Members*

* denotes people and organisations who acted as external reviewers of the briefing.