Coffee Machines Stock Germs, Say Scientists

Coffee machine making an espresso. AFP photo
Coffee machine making an espresso. AFP photo
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Coffee Machines Stock Germs, Say Scientists

Coffee machine making an espresso. AFP photo
Coffee machine making an espresso. AFP photo

Scientists have found that all kinds of pathogens gather in coffee grounds and in used pod machine capsules.

According to the German News Agency (DPA), Fritz Titgemeyer, head of the Food Microbiology Laboratory at the Munster University of Applied Sciences in Germany, said that damp coffee grounds encourage the growth of germs.

If you leave a used coffee pod in the machine for a few days before throwing it out, some mould spores may remain in there and you may be adding them to your next brew.

Titgemeyer noted that a heat-stable poison may have developed, a so-called mycotoxin, and you will not be able to see or taste it.

The water containers and the plastic tubes in coffee machines are also a perfect breeding ground for bacteria if they are not cleaned properly. The expert said that bacteria can settle there in the form of biofilms. All removable components need to be cleaned thoroughly.

Titgemeyer added however disgusting it may be to imagine one's coffee machine full of microorganisms, they do not really pose a health risk.

"The water is heated to 80 degrees Celsius, which kills any germs present in the water tank," he said.

If you use the machine to make cold drinks, however, you may need to worry. Titgemeyer explained that in cold-extracted drinks like iced tea or iced coffee, all germs will remain. The good news is that many coffee machines include a self-cleaning program, but there are also extra things you can do to make sure you keep the germs at bay.



Berliners Jump into the Spree River to Show It’s Clean Enough for Swimming 

People swim in the river Spree to demand the lift of the hundred years old swimming ban at the river in front of the Berlin Cathedral and the TV Tower in Berlin, Germany, Tuesday, June 17, 2025. (AP)
People swim in the river Spree to demand the lift of the hundred years old swimming ban at the river in front of the Berlin Cathedral and the TV Tower in Berlin, Germany, Tuesday, June 17, 2025. (AP)
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Berliners Jump into the Spree River to Show It’s Clean Enough for Swimming 

People swim in the river Spree to demand the lift of the hundred years old swimming ban at the river in front of the Berlin Cathedral and the TV Tower in Berlin, Germany, Tuesday, June 17, 2025. (AP)
People swim in the river Spree to demand the lift of the hundred years old swimming ban at the river in front of the Berlin Cathedral and the TV Tower in Berlin, Germany, Tuesday, June 17, 2025. (AP)

A century after the city of Berlin banned swimming in the Spree River because it was so polluted it could make people sick, there's a push by swimmers to get back into the water.

Around 200 people jumped into the slow-moving, greenish water Tuesday to show that it's not only clean enough, but also lots of fun to splash and swim in the Mitte neighborhood along the world-famous Museum Island.

A group calling itself Fluss Bad Berlin, or River Pool Berlin, has been lobbying for years to open the meandering river for swimmers again.

“For 100 years now, people have not been allowed to swim in the inner-city Spree and we no longer think this is justified, because we can show that the water quality is usually good enough to go swimming during the season,” said Jan Edler, who is on the board of Fluss Bad Berlin and helped organize Tuesday's swim-in.

To circumvent the ban, the group registered their collective swim event as an official protest.

Standing on a little staircase that leads down to the Spree canal, which flows around the southern side of the island, Edler stressed that “we want the people to use the Spree for recreation again.”

He pointed to the fact that the river has been cleaned up thoroughly, and that the water quality has improved in the last decade and is constantly being monitored.

Even city officials in the central Mitte district of Berlin say they'd be interested in introducing river swimming again in 2026.

“There are still many things that need to be clarified, but I am optimistic that it can succeed,” district city councilor Ephraim Gothe told German news agency dpa recently.

Supporters of lifting the swimming ban also point at Paris, where the Seine River was opened up for swimmers for the Olympic Games last year and will be opened this summer for Parisians. Swimming there had been banned since 1923.

In Vienna, too, water lovers can splash into the Danube River canal, in the Swiss city of Basel they can bathe in the Rhine, and in Amsterdam there are some designated areas where people can plunge into the canals.

Only in Berlin, swimming has been continuously prohibited in the Spree since May 1925, when the German capital closed all traditional river pools because the water was deemed too toxic. Some of those pools weren't only used for recreational swimming, but were a place for poor people to wash themselves if they didn't have bathrooms at home.

These days, the water is clean on most days, except when there's heavy rain, which leads to some water pollution.

Allowing swimmers to dive into the river would also mean loosening the historical monument protection on some parts of the riverbanks to install easy access ways to the water and places for lifeguards.

Another problem is the busy boat traffic on the Spree that could endanger swimmers. However, for the time being, the Fluss Bad Berlin group only wants to open up nearly 2-kilometer-long (just over a mile-long) canal where there's no boat traffic.

For what it's worth, the German capital, a city of 3.9 million, could definitely need more places where people can cool off in the summer as regular outdoor pools tend to be hopelessly overcrowded on hot summer days.

“The cities are getting hotter,” Edler said. “It's also a question of environmental justice to create offers for people who just can’t make it out of the city when it’s so hot and can enjoy themselves in the countryside.”