It is about seven addresses in Båstad (see fact box) that now and until further notice have to boil their drinking water.

In connection with the torrential rains last week, bacteria entered the drinking water system.

Now households in the affected areas must boil their drinking water until new tests show that the water is clean again.

Nobody knows why

- We continuously take samples of the water while we look for the error.

In addition, we have added chlorine to further purify the water, says Lars Ödemark, drinking water specialist at NSVA, Nordvästra Skåne's water and sewage system.

But how it happened - no one knows.

- Normally, drinking water and storm water are well separated systems.

It simply must not be able to penetrate dirty water into the drinking water, says Lars Ödemark.

May take a couple of weeks to find the fault

It was NSVA's technical monitoring that began to warn that something was wrong.

The impossible had happened – dirty water from the stormwater system had managed to get into the drinking water pipes.

The hunt for the leak has begun.

- It may take a couple of weeks before we have time to review the entire system.

But I think the water will become drinkable faster than that, says Lars Ödemark.

Watch footage from the flood and hear from some residents the day after the rain in the clip below:

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Eva Kjällsdotter had to have help to wade across the street to her car when the rain chaos hit Båstad - hear her story and watch videos from the evening in the clip above.

Photo: Private/SVT