What is a Dry Toilet? Waterless Toilets Explained

by Sierra EberlyJanuary 09, 2026

Let’s face it: when you're researching toilets for your van, cabin, boat, or tiny home, the terminology can feel a bit… messy. Dry toilet? Composting toilet? Incinerating? It’s enough to make you want to just dig a hole in the woods.

But we’ve got your back. This guide will wipe away the confusion and help you understand exactly what each type of toilet is, how they work, and why the S1 Sealing Toilet stands apart as a true dry flush toilet.

What is a Dry Toilet?

A dry toilet (also called a non-flush toilet) is any toilet that doesn’t use water to flush matter. Instead of moving the contents with water, dry toilets use containment systems where solids and liquids are either stored, separated, or processed.

Common Types of Dry Toilets:

Composting: Separate liquids and solids, starting a decomposition process.
Sealing: Also called a dry flush toilet, it uses a bagging and sealing mechanism to wrap and secure waste immediately.
Separating Sealing: Another “flushable” dry toilet, also separates liquids and solids and uses a bagging and sealing mechanism to wrap and secure solid waste immediately. Liquids are diverted into a separate container that is emptied responsibly as needed.
Bucket: Basic container with absorbent cover material.
Vault or Pit Toilets: Permanent, non-portable versions found at campsites

All Dry Toilet Types Compared

Feature	Composting	Sealing	Separating Sealing	Bucket	Vault or Pit Toilets
Flush Mechanism	No flush	Automatic sealing mechanism	Automatic sealing for solids	No flush	No flush
Water Use	None	None	None	None	None
Chemicals Needed	No	No, but sometimes recommended by manufacturers	No	No	No
Power Requirement	Low (for fan, optional)	Yes (for sealing)	Yes (for sealing)	None	None
Odor Control	Good (fan & separation)	Good (sealed bags)	Excellent (sealed & separated)	Moderate (depends on cover material)	Varies (depends on maintenance)
Waste Processing	Begins composting solids, liquids diverted	Sealed waste for later disposal	Solids sealed, liquids diverted	Stored with absorbent material	Held in underground vault/pit
Legal Disposal	Solids: landfill or compost, Liquids: greywater rules	Typically landfill (check local rules)	Solids: landfill, Liquids: greywater rules	Depends on material; landfill or compost	Managed by site
Maintenance	Regular emptying and fan check	Replace seal rolls, empty regularly	Replace seal rolls, empty both containers	Frequent emptying, add cover material	Site maintained
Environmental Impact	Low (no water, compostable)	Moderate (plastic bag use)	Low to moderate	Low (if composted properly)	Moderate (depends on groundwater protection)
Portability	High	Moderate	Moderate	High	None
Ideal For	Vanlife, off-grid, eco-conscious users	Short trips, minimal handling	Mixed-use, eco-conscious with convenience	Emergencies, simple temporary setups	Public campsites, remote trails

Dry Toilets compared to “Flushing” Dry Toilets

While all the toilets above qualify as dry toilets (don’t need water to operate), not all are considered a dry flush toilet, which by definition is:

“a type of toilet that operates without water, chemicals, or composting. Instead of using water to flush and move waste, these toilets utilize a dry system, often involving a compressed air mechanism or a bagging system, to encapsulate and seal waste.”

The S1 Dry Flush Sealing Toilet is the best (and only!) version of this type of toilet. It separates solids and liquids, and uses a clever sealing system to trap solids after each use, leaving no odor, no leaks, and no 6-month composting wait time. It’s the perfect mix of modern tech and off-grid simplicity.

So to summarize, dry toilets include all toilets that don’t need water to operate, while dry toilets that flush include the handy mechanism that encapsulates waste at the push of a button.

Which Dry Toilet Is Right for You?

Choosing the right dry toilet really comes down to your lifestyle, mobility needs, and how hands-on you’re willing to be. Whether you're vanlifing across continents, managing an off-grid cabin, or just need something simple for weekend camping, there's a dry toilet that fits your flow.

Here’s a quick overview of common use cases and the toilet types that match:

Use Case	Recommended Toilet Type	Why It Works
Full-time vanlife or tiny home living	Composting	Odor control, low maintenance, sustainable, and portable
Short-term travel or city-based setups	Sealing	No smells, minimal handling, and easy disposal
Eco-conscious adventurers who want both hygiene and sustainability	Separating Sealing	Combines odor control, convenience, and better separation of liquids/solids
Occasional camping or emergency preparedness	Bucket	Inexpensive, simple, and easy to store
Remote public campsites or trailheads	Vault or Pit Toilets	Stationary solution maintained by park services

Still unsure? Think about how often you’ll use it, where you’ll be, and how much effort you're okay with when it comes to maintenance. The best dry toilet is one that fits your lifestyle without flushing your sanity down the drain.

Do dry toilets smell?

Not if they’re well designed—like the S1. Sealing or separating mechanisms prevent odors from escaping.

Do dry toilets require chemicals?

Mostly, no. But some flushing dry toilets recommend using a special powder or granules after each use to absorb moisture and reduce odors. These powders are usually made from materials like starches or clay, sometimes with added fragrances. While there are eco-friendly versions, many contain synthetic chemicals that are not environmentally friendly.

The S1 Dry Flush Sealing Toilet does not require any chemical additives due to its urine separating feature.

Can I use a dry toilet in a van or RV?

Absolutely! Our dry toilets are compact, portable, and don't need hookups.

Is a dry toilet the same as a composting toilet?

Yes. A dry toilet is any type of toilet that does not need water to function.

Are dry toilets legal?

Yes, but always check local disposal rules, especially for bagged matter.

Have any more questions?

We love talking toilets! Contact us and we'll get back to you.

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Sierra Eberly

Sierra Eberly is an avid trail runner and solopreneur who has traveled full-time in a campervan since 2020.

After traveling for over a year while working remotely full-time at a corporate job, she shifted gears and pursued her passions for writing and marketing strategy.

Boondock Consulting was formed, and she now supports like-minded small businesses with their big aspiration.

Sierra continues to travel, balancing work and play while trying her best to make a minimal impact on the planet and enjoying everything it offers. You can follow along with her travels via Instagram or Sierra’s personal website, Sierra’s Traverse.

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