Anticimex told newspaper Dagens Nyheter on Thursday that the rat problem continues to grow.
"The rat problem is increasing the whole time, it's been a problem for a long time in Stockholm and continues to escalate," said Anticimex pest controller Sven Jeppsson to DN.
In 2013, there were 11,467 reports about problems with rats in the county of Stockholm. That is more than double the amount in 2005.
It is not uncommon for rats to enter a home through sewer pipes.
"Rats live in our drains and sewers. Where the animals have a protected environment and get what they need," said Sven Jeppsson to DN.
In the end, the animals tend to emerge from the sewers in search of food or new places to live. That's when the rats come out of your floor drain, old sinks or up from the toilet.
The rat problem is just as bad in all parts of Stockholm, writes DN. They are most visible in older central areas such as Södermalm and the Old Town. Sven Jeppsson says that rats are more often seen in such areas as waste disposal is not as easy to handle as in other parts of the city.