The water quality of Wassenaarse Slag at Wassenaar
What is the swimming water like? Wassenaarse Slag? On the water map below you'll see the swimming location in its immediate vicinity. On the right of on this page you will find all information about the current weather, at the bottom of the swimming spots in the area.
Open the Water Map for Wassenaar in full window
The bathing water location Wassenaarse Slag is part of the continuous North Sea beach from Scheveningen to Katwijk. The characterizes as a small-scale family beach. The place Wassenaar lies behind the dune area, in the hinterland ter height of this bathing water location. The protected dunes of Meijendel & Berkheide enclose the swimmingwater location. The beach is accessible via the A44-N44 and subsequently local roads.
Swimming spots nearby
2. Katwijk aan zee boulevard zuid: water quality is good
3. Scheveningen zwarte pad: water quality is good
4. Wassenaarse slag: water quality is good
The weather in Wassenaar, now:
6.2°C
Half bewolkt
Wind Force bft | Knopen | 2 km/h
Wind direction Z
Today: Droog, af en toe zon en vooral in het zuiden warm.
Extended weather forecast for Wassenaar (click)
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Swim at Wassenaarse Slag
Summary
Measurements
E.coli46 n/dl
Enterococci15 n/dl
Water temperature~12.3 °C
Measurement timeQuality: 22-04-2026Temperature: 8 mei, 20:10
Facilities & contact
Monitoring category D
Waste bins
Sandy beach
Salt water
Bicycle shed
WC / Toilets
Information board
Accessible by public transport
Tidal water
Waste bins
Sandy beach
Salt water
Bicycle shed
WC / Toilets
Information board
Accessible by public transport
Tidal water
Address
Wassenaarseslag, Wassenaar
Administrator
Gemeente Wassenaar
gemeente@wassenaar.nl
Phone: 070-5122222
Wassenaarseslag, Wassenaar
Administrator
Gemeente Wassenaar
gemeente@wassenaar.nl
Phone: 070-5122222
Photos
Information board
Details
The water temperature value comes from the nearest official Rijkswaterstaat measuring station and is an approximation for this location. Always take local conditions into account, it is usually colder in deeper water than on the shore!
The water quality measurement is based on the amount of bacteria in nanograms per deciliter (n /dl). In this case it concerns the intestinal bacteria Escherichia coli (E.coli) and intestinal enterococci, which occur in the feces of both animals and humans. A suddenly high value is often related to bird droppings in the water, for example, but can certainly also have other causes. It is unwise to swim in water where these values exceed the standards. The water manager also inspects the bathing water areas for other types of pollution, such as blue-green algae or other toxic algae and general safety features.
The water quality measurement is based on the amount of bacteria in nanograms per deciliter (n /dl). In this case it concerns the intestinal bacteria Escherichia coli (E.coli) and intestinal enterococci, which occur in the feces of both animals and humans. A suddenly high value is often related to bird droppings in the water, for example, but can certainly also have other causes. It is unwise to swim in water where these values exceed the standards. The water manager also inspects the bathing water areas for other types of pollution, such as blue-green algae or other toxic algae and general safety features.