The water quality of Kagerplassen 't Joppe Merenwijk at Leiden
What is the swimming water like? Kagerplassen 't Joppe Merenwijk? 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 Leiden in full window
't Joppe is a southern located lake which part is of the Kagerplassen on the east of Warmond. De swimmingwater location 't Joppe Merenwijk located on the island 'The strands' on the east of the lake Here is a sunbathing area present. The area is enclosed by nature and recreation area.
Swimming spots nearby
2. Kaageiland: water quality is good
3. Kagerplassen 't joppe merenwijk: water quality is good
4. Kagerplassen 't joppe westoever: water quality is good
5. Klinkenbergerplas noordwestoever: water quality is good
6. Klinkenbergerplas westoever: water quality is good
7. Vadedoplas: water quality is good
The weather in Leiden, now:
6.3°C
Zwaar bewolkt
Wind Force bft | Knopen | 11 km/h
Wind direction NO
Today: In het zuidoosten regen, vanavond in het noorden veel wind.
Extended weather forecast for Leiden (click)
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Swim at Kagerplassen 't Joppe Merenwijk
Summary
Measurements
E.coli140 n/dl
Enterococci15 n/dl
Water temperature~15.4 °C
Measurement timeQuality: 04-05-2026Temperature: 9 mei, 12:00
Facilities & contact
Fresh water
Bicycle shed
Floatline
Information board
Waste bins
Bicycle shed
Floatline
Information board
Waste bins
Photo
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.