SWDC Water Supplies

Agenda: 1) Refresher/overview of Wellington Water, our trusted advisor model, and how we are funded 2) Council's community outcomes and wellbeings, how Wellington Water's service goals align, and how these relate to the water supply strategy 3) Brief history of SWDC drinking water supplies 4) Timeline of events, and the changing regulatory environment 5) Wellington Water ~4 years in, and what we have learnt 6) Summary of key investment needs for the region 7) High level options for Memorial Park, and alignment with SWDC outcomes and WWL service goals

Wellington Water, our trusted advisor model, and how we are funded

Council's community outcomes and wellbeings, how Wellington Water's service goals align, and how these relate to the strategy

Key considerations/principles that relate to these and inform the water supply strategy include: -Compliance with drinking water standards (as a minimum) -Providing a network that meets the Code of Practice for Firefighting Water Supplies -Condition and performance of assets to minimise safety risks -Applying the six principles of safe drinking water, being: Principle 1: A high standard of care must be embraced Principle 2: Protection of source water is of paramount importance Principle 3: Maintain multiple barriers against contamination Principle 4: Change precedes contamination Principle 5: Suppliers must own the safety of drinking water Principle 6: Apply a preventive risk management approach

Key considerations/principles that relate to these and inform the water supply strategy include: -Minimising water loss through Prevention (asset renewals, pressure management, network calming); Awareness (Supply zone and District Meter Area management, data consistency, flow analysis); Location (active leakage control, acoustic correlation, non-acoustic methods); Repair (Cut-out and replace or clamp, no-dig methods) -Community education and engagement -Compliance with consents -Minimising disruption for the community

Key considerations/principles that relate to these and inform the water supply strategy include: -Building in operational resilience -Providing duty/standby facilities -Providing multiple routes/directions of supply where possible -Being mindful of the burden of cost to the community (rate payers)

Brief history of SWDC drinking water supplies:

Timeline of events and the changing regulatory environment (for context)

Wellington Water ~5 years in, and what we have learnt

Summary of investment needs/high level water supply strategy for the region

Key investment needs include (but are not limited to):

1. Memorial Park water treatment plant upgrade or replacement
2. Martinborough water treatment plant upgrade (including run to waste system)
3. Waiohine water treatment plant permanent soda ash replacement system
4. Boar Bush reservoir replacement
5. Tauwharenikau river crossing realignment
6. Water supply network renewals and upgrades

We prioritise these improvements based on the risk to the service goals through not progressing these projects.