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Metaldehyde and PES in the
Ampney Brook Catchment
July 2013
Daryl Henehan
Catchment Adviser
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
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
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
The metaldehyde problem – Upper Thames
The metaldehyde problem – Farmoor
Water Treatment Works
6
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
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
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
Next steps
 Determine sampling programme
– Appropriate sample points
– Weekly samples
– Communicate results to participants or individuals
12

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

  • 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