Where is Jänisjärvi?

Jänisjärvi is a lake in Hämeenlinna, Finland. This page reports official water-quality measurements, shown as reported.

Is Jänisjärvi safe to swim in?

Jänisjärvi has official nutrient and clarity measurements, not a bacteria swim class and not a safety clearance. Algal blooms, currents, and depth are not covered. Always check local notices before swimming.

How deep is Jänisjärvi?

Jänisjärvi has a maximum depth of 15.4 feet.

Jänisjärvi

Hämeenlinna, FinlandView map Directions

Syke publishes the water-quality measurements for Jänisjärvi. Here is what has been measured.

Clarity

2.1 m

Typical for Finland

Secchi · sampled 2024

Phosphorus

9 µg/L

Less phosphorus than most

Measured by Syke

Chlorophyll-a

4 µg/L

Less algae than most

Measured by Syke

Max depth

4.7 m

Bathymetric survey

15 ft max depth
Limited data

See the measurements Directions Where to stay

Jänisjärvi in Hämeenlinna, Finland has official water-quality measurements, shown as reported. Water clarity: 2.1 m visibility. Phosphorus: 9 µg/L. Chlorophyll-a (algae): 4 µg/L. Maximum depth: 15.4 ft.

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How Jänisjärvi is classified

Jänisjärvi in Finland is published with the authority's own measurements and class. The measurements here are published by the agency that samples the lake, as reported. Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).

LakeQuality publishes no grade of its own beside it. Everything below thathas been measured is reported on this page.

Monitoring: the Finnish Environment Institute (Syke) and the ELY Centres.

Jänisjärvi is a lake in Hämeenlinna County, Finland with a maximum depth of 15 feet.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2024-08-27. Methodology: how these readings are compared.

Swimming conditions

No reading

Limited data

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Jänisjärvi is safe to swim in today is a call for the Finnish Environment Institute (Syke) and the ELY Centres and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Jänisjärvi

These are the measurements Syke publishes for Jänisjärvi. More on the source.

Moderate clarity, visible to about 6.9 ft. Phosphorus 9 µg/L. Chlorophyll-a 4 µg/L. TSI 43.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	2.1m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	9µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	4µg/L	Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water.
Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a.	43	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Jänisjärvi

Answers come straight from the public measurements and survey records on this page.

Lake Details

Max depth

4.7 m

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Fishing Jänisjärvi

→ Jänisjärvi fishing regulations (limits, seasons, special rules)

Frequently asked questions about Jänisjärvi

Where is Jänisjärvi?: Jänisjärvi is a lake in Hämeenlinna, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Jänisjärvi?: Jänisjärvi in Hämeenlinna, Finland has official water-quality measurements, shown as reported. Water clarity: 2.1 m visibility. Phosphorus: 9 µg/L. Chlorophyll-a (algae): 4 µg/L. Maximum depth: 15.4 ft.
Is Jänisjärvi safe to swim in?: Jänisjärvi has official nutrient and clarity measurements, not a bacteria swim class and not a safety clearance. Algal blooms, currents, and depth are not covered. Always check local notices before swimming.
How deep is Jänisjärvi?: Jänisjärvi has a maximum depth of 15.4 feet.

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Where this data comes from

16 measurements from 1 monitoring station, 2018–2024. Retrieved from Syke VESLA (not the EPA Water Quality Portal) on 2026-08-16.

Collected and reported by

Finnish Environment Institute (Syke) and ELY Centressyke-vesla16 samples · 2018–2024

Analytical methods

SYKE VESLA

Monitoring station identifiers (1)

1820

Authority classifications are shown as the authority published them. See where the data comes from and data sources.