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Do composting toilets smell?

If you’re considering purchasing a composting toilet, you’ve no doubt got a lot of questions knocking about in your head. The most common question we get asked here in the Ecoflo office is ‘do composting toilets smell?’. 

This is a very pertinent question as most people are used to the idea of your waste being flushed away and you never have to deal with it again so it makes sense that when you think about your waste being stored somewhere, you wonder if it’s going to smell. Well, we have a very definitive answer for you. 

Do composting toilets smell?

The simple answer is NO - composting toilets do not smell. 

Now, in saying that there are a couple of caveats to this. A composting toilet that is properly maintained does not smell so if there is a smell coming from your composting loo, this is likely an indication that something is wrong. 

Reasons why a composting toilet may smell

There are a few reasons why your composting toilet might smell, below are a few things you will want to check if there’s an unwanted aroma coming from your composting toilet:- 

  • The exhaust fan has stopped working
  • Your compost pile is too wet
  • You’ve used harsh chemicals to clean your toilet
  • Your compost pile has been exposed to extreme temperatures 
    • This can kill off all the good bacteria and microbes in your composting pile

If your composting toilet smells, this is an indication that something is wrong and you should attempt to troubleshoot what this is. 

A well maintained composting toilet will not smell. 

In the spirit of reconciliation, Ecoflo Wastewater Management acknowledges the Traditional Custodians of this Country. We pay our respects to their Elders past and present and extend that respect to all Aboriginal and Torres Strait Islander peoples today. 




Ecoflo was the first company in Australia to sell composting toilets certified to the rigorous quality testing of Australian Standards. If you want to be certain your composting toilet has adequate capacity and is safe, you need a waterless composting toilet certified to the tough performance criteria of AS/NZS 1546.2:2008.

Shop our range of certified toilets here