Here’s the translated and processed content:
After the weekend, it will be tropical Harm, with Several Sunny Days Ahead. People Looking For Cooling in Natural Water Can Safely Go to Over Eight Hundred Swimming Locations. At Places with a negative swimming advice, eSpecany Blue algae throw a wrench in the works.
AT 811 Locations in the Netherlands, People can take a dip in Natural Water without Health Risks. These are official swimming locations where the water quality is Measured Duration the Swimming Season. For Most Swimming Locations, This Concerns the Period from May 1 to October 1.
Zwemwater.nl Keeps Track of the Quality, So People Can Check This Before Taking a Dip. There are 52 places where people are not to swim. Warnings Apply to 86 Locations, and a Swimming Ban Even Applies to Two Locations. The Map Below Shows All Locations.
In Places Where Swimming is discouraged or for which Warnings Apply, Blue Algae is of the Culprit. These are not algae, but bacteria. If you come in contact with blue algae, you can get diarrhea, eye and skin irritations, headaches and stomach complaints. Animals can that from it.
“An Unsafe Situation” and “Swimmer’s Itch” are also reasons Why People are not to swim. The Latter is caused by the larva of a worm species that occurs in ducks. The Larvae Can Penetrate the Skin a Little. This causes an allergic reaction called swimmer’s itch.
Some Warnings Only State That Swimming Is Discouraged For example, the water can also be contaminated by bacteria Such as E. coli – also Known as the ‘poop bacterium’ – and enterococci.
The Number of Reports About Blue Algae and Other Water Pollution is Currently “Fairly Normal for the Time of Year,” Says Communications Advisor Jane Alblas of the Union of Water Boards to Nu.nl.
Poorer Water Quality Than Before
Earlier in July, ANP Noted After Analyzing the Data From Zwemwater.nl That There Are Significantly More Swimming Locations with Poor Water Quality this year. The Press Agency List The Swimming Locations with at Least One Warning in the Period from January to mid-july.
As can be seen in the graph Below, in 2025 there has been at least one safety warning in effect at 176 locations. Last year there were 111 in the same period. “An increase of Almost 60 percent,” Emphasizes ANP . There are 138 negative advices and warnings in effect on Friday.
“In General, We Do See An Increase in the Number of Reports About, For Example, Blue Algae in Recent Years,” Says Alblas. This is partly due to the hotter, Drier Summers. “The Heat Raises the Temperature of the Water and the Drought Reducces the Flow in the Water System,” She Explains. This results in more stagnant water, which has a negative effect on water quality.
Pollution of the Surface Water also plays a Role. For example, because manure, pesticides and chemical substances from industry end up in the water. “This mean that there are more bad nutrients in the water, which makes makeing or getting the water quality at a good level a major challenge.”
This may be an extra reas to choose an official swimming location for a dip next week. “These locations have the right facilities and the water Quality is Regularly Monitored,” Says Alblas. “If you choose to swim at other locations, this is of course at your own risk. You are then more likely to experience water quality or unsafe situations, for example Due to Shiping Traffic.”