Self-Contained units
The seat and composting chamber are built into one fixture. They are compact and relatively simple to install, but their smaller chamber usually means more frequent emptying and close attention to capacity.
All guides
Greg’s field guide
Composting Toilets
Understand waterless toilet types, ventilation, capacity, and the maintenance they require.
02
No flush water
Steady ventilation
Natural decomposition
Managed material
First, understand the job.
A composting toilet uses no flush water. It contains waste while natural decomposition breaks it down under controlled conditions. That makes it useful for cabins, tiny homes, remote sites, and other places where water or conventional plumbing is hard to provide.
Greg’s stop sign: Waste handling, vent termination, electrical components, and permitted use vary by location. Confirm local requirements before installing or building a system.
Know the equipment
Three common types
Separating toilets
A urine-diverting bowl keeps liquid and solid waste apart. Separating the two helps control moisture and odor, but both streams still need a safe, code-compliant plan for handling and disposal.
Dry toilets
A dry toilet is the broadest, simplest category: no flush water and often a chamber or removable container below. Designs range from basic collection systems to larger composting vaults, so the maintenance routine matters as much as the fixture.
The honest tradeoff
Why choose one—and what comes with it
The upside
No conventional drain or water supply is needed at the fixture, and every use saves potable water. That can make good sense for cabins, tiny homes, off-grid buildings, and water-scarce locations.
The considerations
Every system needs regular maintenance, correct material handling, and ventilation that works all the time. Local health, building, and plumbing rules may limit what is allowed, and every household faces a learning curve.
Water-saving systems matter most where every gallon and every trip for water counts.
See the Kenya ProjectPair waterless sanitation thinking with practical rainwater, greywater, and storage planning.
Read Alternate WaterShort checklist
Check these before you choose.
Plan the ventilation
Confirm the manufacturer’s vent size, height, termination point, and power needs. Poor ventilation is an odor and moisture problem, not a detail to sort out later.
Match capacity to the household
Size the unit for the number of full-time users and the longest expected period between servicing. Weekend capacity and year-round household capacity are not the same thing.
Choose DIY or pre-made
Decide whether a listed pre-made unit or an approved DIY design fits the site, your maintenance tolerance, and local rules. Check with the authority having jurisdiction before buying or building.
One last check
A composting toilet is a small waste-treatment system, not just a different seat. If the venting, capacity, service access, or legal disposal plan is unclear, settle that before installation.