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Bacteria in espresso machine reservoir
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Macuhail
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Posted Mon Nov 11, 2013, 8:44am
Subject: Bacteria in espresso machine reservoir
 

There is a new experiment here: Click Here (openexperiment.com) testing for bacteria in an espresso machine. Apparently he found a fair amount of bacteria in the machine's reservoir and some in the water pitcher used to fill the tank. Fortunately, it appears that the bacteria was killed in the boiler - no bacteria was found in water from the group.

I have wondered about bacteria in my machine and in commercial machines in particular. Does anyone know if we need to have a concern about this or will any potentially harmful bacteria be killed before it goes into the coffee?
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DavecUK
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Posted Mon Nov 11, 2013, 9:34am
Subject: Re: Bacteria in espresso machine reservoir
 

Don't think anyone has died yet, or even got ill. Try washing your tank weekly.
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Macuhail
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Posted Mon Nov 11, 2013, 9:43am
Subject: Re: Bacteria in espresso machine reservoir
 

That is pretty much my thought. As far as I know I've never gotten food poisoning from espresso or lattes. However, we often don't know why we may have an "upset stomach".
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NobbyR
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Posted Mon Nov 11, 2013, 9:46am
Subject: Re: Bacteria in espresso machine reservoir
 

I guess the reservoir does have ideal conditions for bacterial growth, because the water gets warm and comfy from a microbial point of view, albeit there isn't much nutrient. That's why I would recomment to exchange the water at least after a few days and clean the tank weekly. However, tap water in first world countries or bottled water contains hardly any germs at all, and once the water has been heated for brewing or steaming, most of the bacteria that stem from contamination will have been sterilized by the heat. So it's usually not hazardous to your health.

The milk frothing units of superautomatics are much more prone to microbiological colonization and need to be taken care of meticulously.

 
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Posted Mon Nov 11, 2013, 11:54am
Subject: Re: Bacteria in espresso machine reservoir
 

This just added to the list of reasons why I shouldn't upgrade past the Silvia.  I'm the only drinker and I use my Silvia for hot water so I run the tank dry in 3-5 days.
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z0mbie
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Posted Mon Nov 11, 2013, 1:50pm
Subject: Re: Bacteria in espresso machine reservoir
 

Macuhail Said:

Apparently he found a fair amount of bacteria in the machine's reservoir and some in the water pitcher used to fill the tank. Fortunately, it appears that the bacteria was killed in the boiler - no bacteria was found in water from the group.

I have wondered about bacteria in my machine and in commercial machines in particular. Does anyone know if we need to have a concern about this or will any potentially harmful bacteria be killed before it goes into the coffee?

Posted November 11, 2013 link


As expected.   Good to see someone confirming the fact that temperatures above 140F still kills all bacteria...


Microbe                                                                                                           Killed Rapidly At
Worms, Protozoa cysts (Giardia, Cryptosporidium, Entamoeba)                   55C (131F)
Bacteria (V. cholerae, E. coli, Shigella, Salmonella typhi), Rotavirus             60C (140F)
Hepatitis A virus                                                                               65C (149F)

(Significant inactivation of these microbes actually starts at about 5C (9F) below these temperatures, although it may take a couple of minutes at the lower temperature to obtain 90 percent inactivation.)


I still would suggest cleaning your reservoir regularly every few weeks to prevent slime, mildew and scale, as these things affect the taste of water, regardless of it being pasteurized.  Plus it's pretty disgusting.
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frcn
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Posted Mon Nov 11, 2013, 2:18pm
Subject: Re: Bacteria in espresso machine reservoir
 

Do you ever eat in a restaurant? Turn a door knob in a store or other public place? Use a public restroom? I would have to say that bacteria in an espresso machine's reservoir rates fairly low compared to those examples.  (IMO) Our fear of bacterium and use of antibacterial cleaners and the occurrence of resistant strains of some very serious disease-causing microbes is no coincidence. If people can drink coffee made from beans that came out of the rectum of a mammal, the water in the reservoir should be OK.   ;-)

 
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NobbyR
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Posted Mon Nov 11, 2013, 10:52pm
Subject: Re: Bacteria in espresso machine reservoir
 

frcn Said:

If people can drink coffee made from beans that came out of the rectum of a mammal, the water in the reservoir should be OK.   ;-)

Posted November 11, 2013 link

ROFLMAO

 
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CoffeeLoversMag
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Posted Tue Nov 19, 2013, 7:24am
Subject: Re: Bacteria in espresso machine reservoir
 

Dont rely that bad bacteria can be killed in boiling water. It is safe to prevent bacteria to come in your espresso machine. The boiled water can kill anything but let us come down in weighing the risks. To be sure, clean the machine reservoir three times a week.

 
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frcn
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Posted Tue Nov 19, 2013, 11:30am
Subject: Re: Bacteria in espresso machine reservoir
 

CoffeeLoversMag Said:

Dont rely that bad bacteria can be killed in boiling water.

Posted November 19, 2013 link

Sure, it is a good idea to clean the reservoir once in a while, but the boiler is more than just a container of boiling water. It is in actuality a pressure cooker from the point of view of the bacteria. if there is bacteria in your home that is not killed off in the boiler of an espresso machine, there are other serious factors that need to be addressed:
- don't store raw meat on top of the machine
- relocate the cat litter box
- in a commercial setting, if you are running a morgue, stringent hand-washing procedures must be put into place immediately
- post a sign on the machine: "THIS IS NOT A URINAL"

 
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