10 Best Composting Toilets 2025 in the United States

The OGO™ Compost Toilet stands out as a practical solution for those who live in RVs, tiny houses, boats, or off-grid environments. Its urine separating feature is a highlight, effectively preventing odors and eliminating the need for chemicals or water, which is a big plus for users looking for a more eco-friendly option. The toilet's capacity allows for 25-30 uses for solid waste and 2.4 gallons for liquid, which is reasonable for its intended use in smaller spaces.

One of the strengths is its robust build quality, designed to handle up to 550 lbs, ensuring durability over time. Its compact size (15"L x 16"W x 18.4"H) makes it suitable for tight installations, and the modern design adds a touch of aesthetics to small living areas. Maintenance is straightforward due to the removable solids bin and urine bottle, making cleaning a hassle-free process. However, users should note that, while the toilet is designed to be odorless, proper ventilation is still important for optimal performance. It does not require a black tank or dump stations, which can be a significant advantage for those who travel frequently.

On the downside, the OGO™ Compost Toilet has a Best Sellers Rank of #313,898 in Automotive and #80 in RV Toilets, which might suggest that it's not as widely recognized compared to other models. As for power sourcing, this unit is electric, which means a reliable power source is necessary. If you are in a completely off-grid setting, this could be a drawback. The OGO™ Compost Toilet is a strong contender for eco-conscious users seeking a convenient, easy-to-maintain composting toilet solution for compact living arrangements.

The TRELINO Composting Toilet Evo L is a portable, odorless composting toilet designed especially for camping, vans, tents, and other small spaces. It uses a dry separation system that effectively controls odors without relying on chemicals or water, which is great for staying independent from dump stations. With two separate containers—each holding about 2.6 gallons—it can handle up to 11–22 uses for urine and 11–20 uses for solid waste before needing emptying.

The size (approximately 13 x 15.4 x 17 inches) is compact enough for tight spaces, and its sturdy ABS plastic body supports users up to 330 lbs, making it reliable and durable. Ventilation is managed through the design that dries waste to reduce smell, but no powered ventilation system is included, meaning airflow depends on the environment. Maintenance is straightforward thanks to the easy-to-remove waste containers and included bags, although frequent emptying is necessary if used heavily. It doesn’t require electricity, making it convenient for off-grid use.

Its German-made quality and 7-year warranty add confidence in durability, though some users might find the capacity limiting for longer trips or multiple users. This model is a solid choice for those seeking a portable, clean, and eco-friendly toilet option for outdoor or small-space use.

The Separett Villa 9215 is a waterless composting toilet designed for off-grid use, making it an excellent choice for those looking to minimize water usage or who live in remote areas. One of its strengths is its high capacity, allowing it to handle significant waste while efficiently diverting urine, which promotes better composting. The wall-mounted design saves space, a plus for smaller bathrooms or installations where floor space is limited.

Ease of maintenance is another advantage; it comes with all necessary components for simple installation and venting, which can help keep odors at bay. The materials used, including polypropylene, are durable and easy to clean, contributing to the user-friendly experience.

There are a few drawbacks to consider. The requirement for a power source (either AC or DC) can be a limitation for some users, especially in truly off-grid situations where electricity may not be readily available. Additionally, while the installation is designed to be straightforward, those not handy might find the wall mounting a bit challenging. Size-wise, while it’s compact, the 34-pound weight could be a concern for some, especially if frequent relocation is necessary. The aesthetic is quite basic, which may not appeal to everyone looking for a more modern look in their bathroom.

The Separett Villa 9215 is particularly suitable for environmentally-conscious users or off-grid living enthusiasts seeking an effective composting solution. It excels in capacity and maintenance ease but may pose challenges in power requirements and installation for the less experienced.