A small community at the top of Rarangi Beach

Water from our
own aquifer.

North Rarangi Water Supply Inc. has supplied fresh water to households on the northern end of Rarangi Beach since October 1997. Drawn from the shallow aquifer beneath our coast. Owned and run by residents.

Established

1997

Households

~70

Avg use / home

~200 m³

Free allowance

300 m³

Our story

A community taking care of its own water.

Rarangi is a seaside settlement 15 km north of Blenheim, on the eastern coast of the Marlborough Sounds. The North Rarangi area is home to ~70 houses and 11 undeveloped sections — all permanent residences, all on septic tanks, with no commercial activity.

Every home is connected to a metered supply drawn from the Rarangi Shallow Aquifer. Typical household use is around 200 m³ a year, comfortably under the 300 m³ free allowance built into the annual levy.

How it's run

The scheme is owned and operated by North Rarangi Water Supply Inc., an incorporated society formed by residents in October 1997. Day-to-day work — meter reading, billing, minor repairs — is done by a volunteer committee. Specialist work and water-quality monitoring is handled by LiquidAction Ltd and sub-contractors.

The system was originally installed around 1977 by a developer, then operated by the Marlborough District Council, before residents took ownership in 1997.

Our water

The Rarangi
Shallow Aquifer.

An unconfined coastal aquifer of sands, fine gravels, and narrow swales of finer sediments lying just beneath us. The sole water source for the local community.

Water level

Varies from roughly 5 m below ground to surface level in wetland areas. Reflects rainfall patterns and seasonal demand.

Seasonal flow

Highest after winter rain; drawn down through peak summer.

Seawater intrusion

A live concern given the coastal location — heavy pumping near the shore can pull salt water inland.

Shared resource

The same aquifer also irrigates the local golf course.

Aquifer boundaries

  • Pukaka River — north
  • Pukaka Hill — west
  • Wairau Diversion Channel — south
  • Pacific Ocean — east (most critical — controls freshwater flow)

Real-time data

Tank level, pump flow, alarms — straight from the shed.

The scheme is monitored 24/7. Residents can see the current tank depth, pumping rates, and any active alarms from any device. Detailed dashboards available after sign-in.

Tank depth

monitored every 5 min

2.3 m of 2.5 m capacity

Pumping in / out

aquifer → tank → homes

L/s flow rate & daily totals

Power

mains charge & battery

V — alerts if low

UV alarm

treatment status

green when all clear

Get in touch

Questions, a leak, or something else?

The committee handles all enquiries — billing, faults, connections, or general questions about the scheme. We'll get back to you as soon as we can.

If you're already a resident, you can also message us from inside your account and your contact details will be attached automatically.

Email

northrarangi@gmail.com

The committee

  • Bev Doole · President
  • Sarah Kerr · Secretary
  • Carlos Rojas Stiven · Treasurer

Specialist water-quality and infrastructure work is contracted to LiquidAction Ltd.

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