Cryptosporidium Risk Screening Assessment as a Scoping Tool Paul Dansie, Atkins Ireland

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Cryptosporidium Risk Screening Assessment as a
Scoping ToolPaul Dansie, Atkins Ireland
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Risk Screening Assessment Approach

• Guidance Set out in the EPA Drinking Water
  Regulations Guidance Booklet No. 4, January 2008
• Semi-quantitative assessment giving a risk score
  low, moderate or high, very high risk
• Risk Screening Methodology
• Catchment Risk Factors
• Treatment Process, Operation and Management
  Factors
• Population weighted factor 0.4 x log10 (pop.
  served by supply)

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Risk Screening Assessment Approach

• To be used by all Local Authorities to determine
  the risk category of existing supplies.
• High and Very High Risk - Action Programme to
  reduce the risk and detailed assessment of key
  factors.
• Monitoring / Sources protection measures and
  treatment / operation process upgrading.
• Cryptosporidium risk should be assess and any
  corrective action based on source of the risk,
  e.g. species specific risk.
• To be affective requires a specialist input.

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Risk Screening as a Scoping Tool for future WTP
and Supply Networks

• Cryptosporidium has emerged as a significant risk
  to drinking water supplies.
• Adapt the risk screening approach to form a basis
  of early Cryptosporidium scoping assessment of
  proposed new water treatment plants and upgrades
  to WTPs / supply networks.
• The scope should include an assessment of
  proposed Supply Network and upgrade of the
  network through to the Tap.
• Provides a tool for decision-makers at an early
  stage of the potential level risk associated with
  a site location, the key catchment factors and
  level of and type treatment that needs to be
  considered.
• Focuses resources to the site specific risks from
  catchment, proposed treatment, operation and
  management of Cryptosporidium from the start
• Allows for changes in the site location, design
  and treatment processes to meet site specific
  risks.

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