Avoid swimming at Kellokoski beach in Tuusula
Enterobacteria exceeding the action limit were detected at two beaches in Central Uusimaa, while the microbiological quality of the water at other beaches is good. One of the beaches is located in Kellokoski, Tuusula.
On 25–26 June 2025, the Central Uusimaa Environment Centre collected samples for monitoring bathing water quality from public beaches in Järvenpää, Mäntsälä, Tuusula and Nurmijärvi. The samples were tested for Escherichia coli bacteria and intestinal enterococci. The microbiological quality of the water at other beaches met the quality requirements set for bathing water, but at the Kellokoski beach in Tuusula and the Nummisten beach in Mäntsälä, the levels of intestinal enterococci were > 800 cfu/100 ml, which exceeded the action limit of 400 cfu/100 ml.
On Tuesday, 1 July 2025, signs prohibiting swimming were placed on the beaches in question and new samples were taken from the bathing water. The results of the new samples will be available by Thursday, 3 July 2025, at the latest. Runoff caused by rainfall prior to sampling may have increased the bacterial content of river water. Elevated levels of enterobacteria may also indicate contamination from sewage.
The temperatures of the bathing waters ranged from 13.0 to 17.4 °C.
At the time of sampling, there was a small amount of blue-green algae at the Onkimaa swimming beach in Mäntsälä. It is always advisable to assess the blue-green algae situation visually before swimming, as conditions can change rapidly. The cool weather this summer has not been conducive to the growth of blue-green algae so far. If the weather warms up and becomes sunny, the risk of blue-green algae blooms increases. When observing the blue-green algae situation, it is important to note that in windy weather, blue-green algae is often mixed into the water, whereas in calm and sunny weather, blue-green algae is easily visible on the surface of the water.
Information on bathing water quality
The Central Uusimaa Environment Centre website has a table showing the results for bathing beaches, which is updated with the results of water samples taken during the bathing season.
The sample results can also be found on the notice boards at the beaches.
Blue-green algae sightings can be monitored on the Järvi-meriwiki website maintained by the Finnish Environment Institute, where anyone can also report their own blue-green algae sightings.
Further information:
Central Uusimaa Environmental Centre, Health Inspector Helmi Heiska, +358 40 314 4745, helmi.heiska@tuusula.fi
The original announcement can be found on the Central Uusimaa Environmental Centre website.
This content has been translated using AI