Metaldehyde and PES in the Ampney Brook Catchment (Daryl Henehan)

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  • 1. Metaldehyde and PES in the Ampney Brook Catchment July 2013 Daryl Henehan Catchment Adviser
  • 2. 2 Overview  Drinking water quality  Why is metaldehyde a problem?  Possible solutions  What would we like from this trial?  What we need to know today  Next steps  Questions?
  • 3. 3 Drinking water quality  EU and UK Drinking Water Regulations  Standards for a number of chemicals, including: – Pesticides 0.1µg/l – ‘Total’ pesticides 0.5µg/l
  • 4. 4 The metaldehyde problem  0.1 µg/l standard applies metaldehyde  Legal requirement for water companies  Metaldehyde is routinely found in many water sources at levels above 0.1 µg/l  Not removed by conventional water treatment  Additional treatment is extremely expensive and energy intensive  What else could we do to solve this problem?
  • 5. 5 The metaldehyde problem – Upper Thames
  • 6. The metaldehyde problem – Farmoor Water Treatment Works 6
  • 7. 7 Possible solutions  Catchment Management  Working with pesticide users to raise awareness and encouraging best practice  Thames Water is trialling a variety of projects throughout the River Thames catchment  PES is a form of catchment management – paying pesticide users to go beyond best practice  Also trialling abstraction management at Farmoor WTW later this year
  • 8. 8
  • 9. 9 What would we like from this trial?  Investigate the effect of different land management practices on metaldehyde use  Find out what farmers would need to enable them to take part in PES schemes in the future  To monitor metaldehyde concentrations associated with the different land management practices
  • 10. 10 What we need to know today  Are you interested in participating in this trial?  Information on land management practices  Are you willing to be involved in a sampling programme?  Can you see any potential problems with this approach?  Are you willing to support our abstraction management trial by telling us when you have applied metaldehyde this autumn?
  • 11. 11 Next steps  Determine sampling programme – Appropriate sample points – Weekly samples – Communicate results to participants or individuals
  • 12. 12