The hidden nasties that'll turn you off coffee machines forever

Kristine Tarbert
Lifestyle & Entertainment Producer

These days, many of us can’t function without a coffee machine, but whether or not you think you’ve been cleaning it properly, you might be in for a nasty surprise.

Research has revealed that home coffee machines are actually likely to be housing a “community of bacteria”.

In a study conducted by the the University of Valencia, researchers tested machines that had been in use for at least a year and found that flushing them out every now again with boiling water wasn’t enough to keep them clean.

Your machine be housing a ‘community of bacteria’. Photo: Getty

As part of their research, which was published in 2015, they tested ten different Nespresso machines and found that the coffee waste reservoir showed “the existence of a varied bacterial community in all machines sampled.”

That’s every single machine having a “moderately to high abundant” number of bacteria, including high numbers of pseudomonas – a common bacteria that doesn’t normally cause infection in healthy people, but can be a risk to those with a low immune system.

“They contained a significant bacterial diversity, with the total number of identified genera ranging from 35 to 67,” researchers revealed.

Given that Nespresso is a relatively top level brand with great options for cleaning, we’d hate to think what a generic coffee machine’s results would look like.

Might be sticking to the cafe. Photo: Getty

For these machines specifically, researchers suggested regular maintenance of the capsule containers.

And even though we thought boiling water kills all germs, in this case it’s not enough.

Instead vinegar is apparently the way to go.


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