Composting Toilets
These avoid unnecessary flushing and manage human waste through controlled biological processes in the right application.
WCTNZ® Backs WaterlessWhy Waterless?
Why Waterless?
Smarter sanitation starts earlier.
WCTNZ® promotes waterless systems because, in the right application, using clean water to carry or flush sanitary waste is not always the smartest way to manage it.
For us, waterless is about more than saving water alone. It is about protecting better water, reducing unnecessary dilution, and handling sanitary waste streams more intelligently from the beginning.
Two Pathways
Normal is not always the same as sensible.
Different systems suit different jobs, but the key question stays the same: should clean water be used here at all?
Conventional Flush Path
Clean water is added first.
A larger diluted waste stream is created.
More transport, treatment, discharge, or land application is needed later.
Waterless Approach
Separate earlier.
Dilute less.
Manage the stream more directly and more intentionally.
One shared principle: use water where it adds value, but do not use it by default where a better-matched waterless system can do the job more intelligently.
Protect Better Water
WCTNZ® takes a wider view of water, including the waterways and groundwater people do not always see.
Reduce Unnecessary Dilution
Adding clean water to sanitary waste can create a larger downstream wastewater and effluent-management problem.
Design More Intelligently
Match the right waterless system to the real site, building, user load, servicing path, and long-term outcome.
The WCTNZ® view
Waterless is not about making sanitation feel lesser. It is about asking a better question from the start.
Should clean water be used by default to move sanitary waste, or is there a better-matched way to manage that stream? For WCTNZ®, that is where the real value of waterless sanitation begins.
Waterless thinking reaches beyond one product type. It helps explain why composting toilets, dry toilets, drying toilets, urine-diverting toilets, and waterfree urinals can all sit within a more intelligent sanitation approach.
New Zealand’s water story is bigger than what you can see
When people think about waterways, they often think only about rivers, streams, lakes, and beaches. But the picture is wider than what is visible on the surface. Groundwater, wetlands, estuaries, land application, and receiving environments all form part of the same broader story.
That matters because what happens on land does not always stay on land. Wastewater outcomes, site design, and water quality are connected over time, even where those connections are not obvious at first glance.
That is why WCTNZ® does not frame waterless systems only as a convenience or an off-grid option. We also see them as part of a smarter way to think about water, land, and sanitary waste before it becomes a larger downstream issue.
One connected picture
Waterless thinking makes more sense when water is understood as part of a wider connected system rather than just what is visible above ground.
Rivers, streams, and lakesThe visible waterways people think about first.
Wetlands, estuaries, and receiving environmentsWhere land use and discharge decisions still matter.
Groundwater below the surfaceImportant, often hidden, and still part of the same wider water story.
Land use, wastewater, and site designWhat happens here can influence what happens elsewhere over time.
Waterless systems matter in New Zealand not only because water is valuable, but because the wider water picture is more connected than it first appears.
Why using clean water for waste transport is not always sensible
A conventional flush system uses clean water to move sanitary waste away. Once that happens, the waste stream becomes larger, more diluted, and more dependent on infrastructure for transport, treatment, storage, discharge, or land application.
That may be normal, but it is not automatically the best answer in every setting. On some properties, especially where land is sensitive, water supply is limited, infrastructure is constrained, or wastewater volumes need to be kept down, adding water to the problem at the beginning does not necessarily improve the end result.
WCTNZ®'s position is simple: use water where it adds value, but do not use it by default where a better-matched waterless path can do the job more intelligently.
Two ways of thinking
This is not about saying every site should use the same system. It is about choosing the path that makes better sense for the application.
Flush first
1
Use clean water as the transport mechanism.
2
Create a larger volume of wastewater that still requires treatment.
3
Rely more heavily on downstream management.
Separate earlier
1
Avoid unnecessary flushing from the start.
2
Keep the sanitary waste stream more controlled.
3
Reduce unnecessary dilution and support a more direct management path.
Waterless is bigger than toilets
This page is not just a companion to composting toilets. It is a foundation page for the wider WCTNZ® value system. Different product types use different methods, but they can all sit within the same broader waterless logic.
Dry Toilets
These are non-flush toilet systems where water is not used as the transport mechanism for sanitary waste.
Drying Toilets
These are systems designed to dry and desiccate human waste rather than manage it as a flushed stream.
Urine-Diverting Toilets
These separate urine and solids at the source to reduce moisture loading and keep the waste pathway more controlled.
Waterfree Urinals
These remove flushing water from a use case where it is often unnecessary, while reducing water demand and wastewater loading.
Why this matters in the real world
Waterless thinking is not abstract. It matters in everyday projects, commercial settings, and sensitive site conditions where water use, wastewater design, or downstream handling are real parts of the decision.
Homes, baches, and second toilets
Waterless systems can make practical sense where flushing is unnecessary, infrastructure is costly, or use patterns are intermittent.
Rural, remote, and off-grid sites
Where supply, servicing access, and wastewater design all matter, reducing unnecessary water use can be part of a better fit.
Public and commercial settings
Waterfree urinals and other waterless solutions can reduce water demand while supporting robust, practical sanitation design.
Sensitive land and constrained wastewater sites
Reducing unnecessary dilution can help reduce the overall volume of effluent requiring downstream handling or land application.
Yes saving water still matters
Water saving remains a real part of the value story. It matters where supply is limited, where infrastructure is expensive, and wherever high-quality water should not be used for a job that does not always require it.
But for WCTNZ®, saving water is not the whole story. The stronger case for waterless is that it can also reduce unnecessary dilution, support better source separation, and encourage more thoughtful sanitation design from the beginning.
So yes, waterless systems save water. But they also reflect a better logic around resource use, wastewater volume, and the protection of waterways and receiving environments.
WCTNZ® waterless approach
WCTNZ® does not see waterless as a niche idea or a compromise. We see it as a serious and often more sensible design approach in the right application.
That is why we promote composting toilets, dry toilets, drying toilets, urine-diverting toilets, and waterfree urinals. Different systems suit different jobs, but the underlying thinking is the same: protect good water, avoid unnecessary dilution, and manage sanitary waste more intelligently from the start.
It is also why WCTNZ® puts such strong emphasis on proper system matching. Not every site needs the same answer. The right outcome depends on land conditions, user patterns, servicing expectations, building context, compliance requirements, and long-term practicality.
Keep exploring the WCTNZ® foundation pages
This page is designed to sit alongside the wider pages that explain the WCTNZ® approach, values, leadership, and product categories.
Talk through the right waterless path
Whether you are looking at composting toilets, dry toilets, drying toilets, urine-diverting toilets, or waterfree urinals, WCTNZ® can help match the right system to the right application. You can also email sales@wctnz.co.nz.
