Transcript Strategy & Planning Training Programme

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
More about DWSPs
• They may include quality assurance systems (e.g. ISO
9001:2000)
• However, existing practices may not include systemtailored 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/dwq/wsp0506/
en/index.html
• Water Safety Plan Manual and WSPs for large buildings in
preparation by WHO
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
DWSP components
• system assessment to determine whether the drinkingwater supply chain (up to the point of consumption) as a
whole can deliver water of a quality that meets healthbased targets. This also includes the assessment of
design criteria of new systems.
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.
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.
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
DWSP Elements
The scope :• Catchment
• Treatment
• Storage and distribution
• Consumers’ premises, including public buildings
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
Amended Regulations
• Cryptosporidium
• Requirement for specific risk
assessment revoked
• Transitional arrangements until 1/1/09
• Notification arrangements (for
Cryptosporidium)
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 >10 m3/day (on average) or
serving more than 50 people