What are DWSPs

1
What are DWSPs ?

• WHO Initiative
• Comprehensive risk assessment and risk management
  approach
• Source-to-tap
• Multiple-barriers
• HACCP
• Many elements will already be part of existing
  good practice

2
More about DWSPs

• They may include quality assurance systems (e.g.
  ISO 90012000)
• However, existing practices may not include
  system-tailored hazard identification and risk
  assessment
• See 3rd Edition WHO Guidelines (2004)
  www.who.int/water_sanitation_health/dwq/en/gdwq3_4
  .pdf
• Water safety plans Managing drinking-water
  quality from catchment to consumer (WHO August
  2005) http//www.who.int/water_sanitation_health/d
  wq/wsp0506/en/index.html
• Water Safety Plan Manual and WSPs for large
  buildings in preparation by WHO

3
What are the drivers ?

• Standards on their own do not achieve reliable
  quality
• For some issues, risk-based approaches are much
  more appropriate than standards
• In many parts of the world, the need is not for
  more standards but proper controls and procedures
  to achieve the existing standards
• Improvement of customer confidence by ensuring
  quality reliability
• Introduction of proper risk-based management
  systems

A better way of achieving good water quality
4
DWSP components

• system assessment to determine whether the
  drinking-water supply chain (up to the point of
  consumption) as a whole can deliver water of a
  quality that meets health-based targets. This
  also includes the assessment of design criteria
  of new systems.

5
DWSP components

• identifying control measures in a drinking-water
  system that will collectively control identified
  risks and ensure that the health-based targets
  are met. For each control measure identified, an
  appropriate means of operational monitoring
  should be defined that will ensure that any
  deviation from required performance is rapidly
  detected in a timely manner.

6
DWSP components

• management plans describing actions to be taken
  during normal operation or incident conditions
  and documenting the system assessment (including
  upgrade and improvement), monitoring and
  communication plans and supporting programmes.

7
The process

• Identify the hazard
• Assess the risk of the hazard reaching the
  consumer and causing health effects
• Define the barriers and the operational controls
  that show that the barriers or the process is
  working at its optimum at all times
• Corrective action that is required to minimise
  the hazard
• Verify that the corrective action has been
  successful and has been recorded

8
DWSP Elements

• The scope -
• Catchment
• Treatment
• Storage and distribution
• Consumers premises, including public buildings

9
Amended Regulations (2007)

• Disinfection
• Disinfect (remove or render harmless), and
• Sufficient preliminary treatment to prepare it
  for disinfection
• Risk Assessment
• Water Safety Plan
• Treatment works and connected supply system
• By 1 October 2008
• Risk assessments to be kept under review

10
Amended Regulations

• Cryptosporidium
• Requirement for specific riskassessment revoked
• Transitional arrangements until 1/1/09
• Notification arrangements (for Cryptosporidium)

11
Drinking Water Protected Areas

• WFD Article 7 establishes a register of Protected
  Areas and identifies water used for the
  abstraction of drinking water
• All bodies of water used for abstraction for
  human consumption providing gt10 m3/day (on
  average) or serving more than 50 people