Travelling Australia by caravan or motorhome means managing waste on the road. Understanding the difference between grey water and black water matters - the rules around each are different, the disposal methods are different, and getting it wrong can result in fines and real environmental harm.
What is Grey Water?
Grey water is wastewater from your caravan's sink, shower, and kitchen. It includes water used for washing dishes, rinsing vegetables, and showering. It does not contain toilet waste.
Grey water still contains soap, food particles, grease, and bacteria, which is why it cannot simply be released anywhere. However, it is generally considered lower risk than black water and is treated differently under Australian regulations.
Some caravans collect grey water in a dedicated holding tank underneath the van. Others release it directly via a drain outlet. If you are not sure which setup your rig has, check underneath for a grey water outlet - it will usually be a small pipe or valve separate from any black water connection.
What is Black Water?
Black water is waste from your toilet - either a cassette toilet or a fixed flush toilet connected to a black water holding tank. It contains human waste and must always be treated as hazardous.
Black water cannot legally be released onto the ground, into waterways, or into stormwater drains anywhere in Australia. It must be disposed of at a designated dump point. There are no exceptions to this rule, regardless of how remote your location is.
Disposing of Black Water
Black water must always go into a dump point. This applies equally to cassette toilets - where you carry the removable cassette to the dump point - and to fixed black water tanks, which are drained via a hose connection.
To find your nearest dump point, use the interactive map or browse by state. For step-by-step instructions on the process, see the guide to how to use a dump point.
Key rules for black water disposal:
- Never pour black water onto the ground, into a pit, or into a stormwater drain
- Never dispose of black water in a general rubbish bin, even in sealed bags
- Do not leave a cassette at a dump point - empty it, rinse it, and take it with you
- If a dump point is full or out of order, find the next one rather than improvising
- If black water spills during disposal, rinse the area thoroughly with water into the dump point inlet
For advice on using dump points considerately and keeping sites in good condition, see the guide to dump point etiquette.
Disposing of Grey Water
Grey water rules are more flexible than black water, but they still apply and vary significantly depending on where you are and who manages the land.
As a general rule across most of Australia, grey water can be released onto the ground provided:
- It is well away from any waterway, creek, or beach
- It is not on a sealed surface or near a stormwater drain
- It is not near a bore, well, or drinking water source
- It is dispersed over a reasonable area rather than pooled in one spot
- It is not on someone else's property or in a public place where it causes a nuisance
- You are using biodegradable, phosphate-free soaps where possible
These general rules are overridden in certain locations. National parks, state forests, marine parks, and many council-managed areas have stricter requirements. In these areas, all grey water must go into a dump point or designated outlet - not onto the ground.
When in doubt, use the dump point. It is always the correct option and costs nothing extra.
Rules by State
Grey water disposal rules in Australia are set at the state and territory level, and in some cases at a local council or park management level. The following is a general guide - always check with local authorities or park management for the specific rules that apply where you are travelling.
New South Wales
Grey water release onto ground is generally permitted in remote and rural areas, subject to the standard conditions above. National parks managed by NSW National Parks and Wildlife Service require all waste water to be contained and disposed of at designated facilities. Find dump points in New South Wales.
Victoria
Grey water release is permitted in certain circumstances but is restricted in parks managed by Parks Victoria. Check signage on entry to any park or reserve. Find dump points in Victoria.
Queensland
Similar general rules apply across Queensland. National parks and marine parks require all waste water to be disposed of at dump points or dump stations. Some coastal and island areas have additional restrictions due to sensitive ecosystems. Find dump points in Queensland.
South Australia
Grey water can generally be released onto ground in remote areas under standard conditions. Restrictions apply in conservation parks and across Kangaroo Island. Find dump points in South Australia.
Western Australia
Rules vary significantly across WA given the range of environments. Remote and pastoral areas generally permit ground release under standard conditions. National parks and marine parks managed by the Department of Biodiversity, Conservation and Attractions require dump point use. Find dump points in Western Australia.
Tasmania
Parks and Wilderness managed areas require all waste water to be disposed of at facilities. Grey water release onto ground may be permitted in remote areas under leave-no-trace principles, but check with the relevant land manager before assuming this applies. Find dump points in Tasmania.
Northern Territory
Remote areas generally permit ground release of grey water under standard conditions. Parks managed by Parks Australia or NT Parks and Wildlife have stricter requirements. Given the sensitivity of many NT waterways and ecosystems, erring on the side of caution is advisable. Find dump points in the Northern Territory.
Australian Capital Territory
The ACT is largely an urban environment. Grey water should be disposed of at a dump point or sewer connection. Find dump points in the ACT.
Using a Dump Point for Both
All dump points accept both black water and grey water. If you have a grey water holding tank, you can drain it into the dump point inlet at the same time as you empty your black water - there is no need to make two separate trips.
Grey water is also practical for rinsing your cassette or hose after emptying. Any rinse water can go straight into the inlet.
Some dump points also have a separate grey water drain outlet next to the main inlet - this is clearly marked where present. Either outlet is suitable for grey water.
To find a dump point near you, use the interactive map or browse by state using the links above.
Common Questions
Can I put washing machine water down a dump point?
Yes. Wastewater from a caravan washing machine is grey water and can go into a dump point. The same ground-release rules that apply to sink and shower water apply to washing machine water - though washing machine water tends to have higher detergent concentrations, so using biodegradable products makes ground release more acceptable in permitted areas.
What about dishwashing water?
Dishwashing water is grey water. If you are in an area where grey water release is permitted, you can tip it onto ground away from waterways. Otherwise, use the dump point or retain it in your grey water tank until you reach one.
Is there a difference between a dump point and a sewer connection?
A dump point is an open inlet that you pour or drain waste into directly - it connects to the sewer system. A sewer connection, sometimes called a sullage connection, is a direct pipe fitting used at powered caravan park sites. Both are suitable for grey and black water disposal.
What chemicals can I use in my black water tank?
Most commercial cassette toilet chemicals and tank treatments are safe for dump points, which connect to the sewer. Avoid products labelled for septic systems only, as these may contain bacteria that are designed to break down waste in a closed system rather than flow through to sewage treatment. Enzyme-based treatments are generally considered the most environmentally responsible option.
Can I release grey water at a free camp?
It depends on the free camp and the land it sits on. Many roadside rest areas and council free camps allow grey water ground release under standard conditions. Others, particularly those in national parks or conservation areas, do not. Check the site rules on entry, or look up the land manager's guidelines before you arrive. If signage is unclear, treat it as a no-release area and find a dump point.
Do I need a special hose for grey water?
Not necessarily. If your caravan has a grey water holding tank with a drain valve, you can connect a standard hose to drain it into the dump point inlet. If your van releases grey water through a simple outlet pipe underneath, you may just need a bucket or a short section of hose to direct it into the inlet without splashing. Keep your grey water hose clearly labelled and separate from your fresh water hose.
Last reviewed April 2026. Rules and regulations change - always verify current requirements with local authorities or park management before travelling.