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Septic Tanks Wellington

On-site greywater and sewage systems

If connecting to Wellington district’s main sewerage system is not possible, an on-site sewage system is the answer.

However, it is crucial the septic system is designed, sized and installed by a registered plumber and maintained properly. Your septic system must be sufficiently large and efficient enough to treat all of the wastewater from your household – both now and in the future.

An undersized, poorly designed or under-maintained system may not adequately cope with your household’s wastewater, endangering human health and the environment. As the homeowner, it is your responsibility to ensure on-site sewage systems are maintained and operating correctly.

Get a registered, approved Wellington plumber and installer on the job.

recycling grey water

Do you live outside Wellington city?

The discharge of sewage and wastewater into our environment has serious impacts on soil structures and water aquifers. Therefore, local and regional authorities require rural residents and bach or holiday homeowners unable to be connected to the main sewerage system to manage, treat and dispose of their household’s sewage and wastewater within the boundaries of their own property.

To meet the effluent quality standards required by Wellington district councils, you will need a robust septic tank or secondary treatment system.

At Central Plumbing, we recommend installing an AirTech™ system.

Sewage systems for lifestyle blocks in Wellington

Not all sewage systems are created equal or even operate that reliably. The last thing you want on your lifestyle block or rural property is a sewage system nightmare causing a stink and costing thousands to put right.

Do you know which septic tank system is best for your property?

Septic tank systems can cost from $8,000 – $12,000. Some will operate well for many years while others can cause expensive and ongoing problems after only a very short period of time. You don’t want to install a system that costs loads to run or doesn’t work properly. Getting diggers out to your property again to dig it all out and install a different system is far from ideal.

If you don’t want sewage system problems, get Anthony to visit your site and make sure you are getting the most cost-effective sewage system for your property.

We install septic tank systems in Owhiro Bay, Waikanae, Makara, Happy Valley, Riverstone Terraces, Stokes Valley, Porirua, Kapiti Coast, Otaki and all rural properties in between. If you live outside the Wellington district’s main sewerage system, we can help.


What is AirTech™?

The AirTech™ aerated wastewater treatment plants are designed to process and recycle all domestic sewage and greywater effectively and in a sustainable way and we can install these septic tanks Wellington wide.

This treatment plant safely and effectively processes all household sewage and wastewater, recycling it as clear, odourless, nutrient-enriched water for irrigation. Your household sewage and wastewater will be treated to national standards and discharged within your property with little or no environmental impact on the land.

With robust, yet flexible polyethylene construction, and its own smart Communication Management and Alarm System, AirTech not only reduces environmental impact, but also helps facilitate compliance with council and other relevant regulatory guidelines.

RX Plastics AirTech™ tanks are only installed by approved and certified installers, and that is the plumbing team from Wellington’s Central Plumbing.


The RX Septic Tanks. Pump Chambers and AirTech™ are manufactured from the industry’s strongest grade of polyethylene, giving a long life and performance after installation.

This diverse product range can be used in both new and existing applications and be retrofitted to existing tanks to increase treatment capacity.


The new sphere tank by RX Plastics has been proven to be the strongest configuration for inground use.

These septic tanks provide a simple, practical and efficient on-site alternative for managing household sewage disposal.


  • Odourless
  • Minimal sound
  • Low running costs
  • User friendly – wireless touch screen alarm system
  • More flexible in the ground than concrete
  • 15-year guarantee


Airtech™ 9000 (2000 litres / day)

Ideal for houses of up to 8 bedrooms

AirTech™ 7000 (1600 litres / day}

Ideal for houses and batches up to 4 bedrooms

grey water irrigation

Reusing your greywater

Want to save on your water bill? If your property has a mains sewer connection, you’re legally required to use it, but you are still allowed to install a greywater system, even in central Wellington.

The Kapiti Coast District Council reported that with residential water use, 68% (160 litres per person per day) is greywater that could be reused. There is huge potential to take pressure off the reticulated water supply network.

Reusing your laundry, bath, basin and shower water can reduce your water use, saving you money.

With the right system correctly installed by a certified plumber, much of your household water can be reused on the garden or for flushing toilets.

Benefits of using greywater

  • Reduces your reliance on the mains water supply system.
  • Reduces the wastewater peak flows discharging to council’s wastewater system.
  • Reduces the load on sewerage systems including on-site treatment systems.
  • Provides a garden water supply, so you can water your gardens even during droughts.

However, it’s vital that any system you use for collecting and reusing greywater is properly installed and maintained. You’ll need to check with your local Wellington council before installing a system to collect and reuse greywater, get a building consent and you must employ a certified plumber to configure your system.

Is greywater safe to reuse?

Yes, if your system is properly installed and maintained. If you do want to have a greywater recycling system at home:

  • it needs to be properly installed and maintained
  • the greywater needs to be kept away from direct human contact if you’re using it in the garden
  • it should not be used to wash clothes
  • untreated greywater should be used within 24 hours.
  • overflows should drain to the wastewater system.


How do you collect and reuse greywater?

There are several options for collecting and using greywater.

In general, a garden greywater system will divert water from your washing machine, shower, bath or basin so that solids such as lint and fats are filtered out.

Maintenance – cleaning or replacing filters – is required to keep your recycling systems operating properly.

At Central Plumbing, we recommend installing an AirTech™ system.

We install greywater systems and septic tanks Wellington wide. From rural lifestyle blocks to people wanting to reuse their greywater in Wellington city, we can install a robust, safe wastewater treatment plant.