Managing wastewater on your property

Maintaining your wastewater system

As a property owner, you are responsible for maintaining your on-site wastewater system and knowing how it works.

All on-site wastewater systems need to dispose of the water used in your home. In most cases, this is a disposal field. This area is where the treated water from your septic tank is distributed. It may be lawn or bush. The area should not be used by vehicles or stock.

If the area is boggy, smelly or overgrown, there might be a leak that needs to be repaired.

Advice for Aotea / Great Barrier Island and Waitākere

General advice​

Types of wastewater systems

Read the transcript of this video.

Most properties in Auckland are connected to Watercare's piped network and pay for water supply and wastewater collection and treatment.

Households in rural areas and on the Hauraki Gulf islands often do not have access to Watercare's network. They have on-site wastewater systems to treat their sewage and other wastewater.

Primary systems

A primary system has a septic tank and disposal field. These units tend to be older and use simple technology.

Secondary or tertiary systems

Secondary and tertiary systems have multiple treatment tanks and a disposal field. They often use electric pumps and have multiple chambers for increased filtration.

Other systems

Other systems include composting toilets and worm farms, which have their own maintenance requirements.

Email us at safeseptic@aucklandcouncil.govt.nz or contact your system manufacturer if you are unsure of your maintenance requirements.

Proof of maintenance

In July 2022, we sent letters to property owners to request their proof of wastewater maintenance.

This letter explains:

• the type of proof we need to see
• how long you have to submit your records.

Failure to maintain your system may result in a fine or penalty.

Who can service your on-site wastewater system

There are many companies in Auckland who service, pump out and repair on-site wastewater systems.

The companies listed in the table use our standard form for servicing. They provide this form directly to us on your behalf.

We do not guarantee the work carried out by any service provider.

We recommend using a company approved by your system manufacturer.

Rules for on-site wastewater systems

The rules for inspecting and maintaining on-site wastewater systems are set by the Auckland Unitary Plan (PDF 65.8KB).

At minimum:

• a primary system needs to be inspected every three years
• a secondary or tertiary system needs to be inspected every six months.

Maintenance involves inspecting your system and cleaning or repairing any parts that might be blocked, damaged or worn.

The sludge and scum need to be pumped out when it fills half the volume of the tank. This work should always be done by a trained professional.

Faulty on-site wastewater systems

Without proper maintenance, your system can stop treating your wastewater.

Faulty on-site wastewater systems can harm human health and the environment.

Your system needs maintenance if you notice:

• a blockage or overflow of sewage waste
• broken tank lids
• murky or smelly puddles on your property
• scum and sludge build-up in your septic tank.

Where you can, avoid:

• overloading your system with too much water
• letting rain into your system
• putting harsh cleaning products, other chemicals, food waste or rubbish into your system.

If you do not maintain your system properly, you can be fined for each day the faulty system is used.

Upgrade your on-site wastewater system

The design of your on-site wastewater system needs to suit the way it is used. Review your on-site wastewater system if:

• you are renovating your house
• more people will live on your property
• your summer holiday home becomes your permanent residence
• you start to host a lot of visitors.

The above changes mean more water will flow through your system, putting more strain on how well your tanks and disposal field can treat your sewage and wastewater.

If you upgrade your on-site wastewater system or build a new one, you will need to apply for a building consent and may need a resource consent.

See Install or alter an on-site wastewater treatment and disposal system.

Waitākere pump-out programme

We pump out standard septic tanks, long drops, greywater tanks and grease traps every three years for properties in the former Waitākere Local Board area.

If you own property in this area, you pay a targeted rate for this service, but you still need to arrange your own inspections with a private company every three years.

This pump-out programme does not cover secondary or tertiary systems, which need maintenance every six months.

Useful wastewater documents

Contact us

Contact septic.tank@aucklandcouncil.govt.nz for more information about the Waitākere pump-out programme.

Email safeseptic@aucklandcouncil.govt.nz for information about maintenance and water quality concerns.