Where is Jänijärvi?

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

Is Jänijärvi safe to swim in?

Jänijärvi 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 Jänijärvi?

Jänijärvi has a maximum depth of 14.4 feet.

Jänijärvi

Tammela, FinlandView map Directions

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

Clarity

0.6 m

Murkier than most

Secchi · sampled 2024

Phosphorus

43 µg/L

More phosphorus than most

Measured by Syke

Chlorophyll-a

30 µg/L

More algae than most

Measured by Syke

Max depth

4.4 m

Bathymetric survey

14 ft max depth
Limited data

See the measurements Directions Where to stay

Jänijärvi in Tammela, Finland has official water-quality measurements, shown as reported. Water clarity: 0.6 m visibility. Phosphorus: 43 µg/L. Chlorophyll-a (algae): 30 µg/L. Maximum depth: 14.4 ft.

Loading map…

How Jänijärvi is classified

Jänijärvi 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.

Jänijärvi is a lake in Tammela County, Finland with a maximum depth of 14 feet.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2024-08-26. 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 Jänijärvi 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.

Get alerts for Jänijärvi →

Water quality measurements for Jänijärvi

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

Very murky, less than 2 ft of visibility. Phosphorus 43 µg/L. Chlorophyll-a 30 µg/L. TSI 63.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	0.6m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	43µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	30µg/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.	63	Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic

High nutrients, frequent algae, reduced clarity

Ask about Jänijärvi

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

Lake Details

Max depth

4.4 m

Stays via Stay22

Stays near Jänijärvi

Compare lakeside cabins, hotels, and vacation rentals near Jänijärvi in Tammela, Finland — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near Jänijärvi

Prices for Oct 2–4, 4 adults. Change dates on the map below.

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Follow Jänijärvi’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing Jänijärvi

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

Frequently asked questions about Jänijärvi

Where is Jänijärvi?: Jänijärvi is a lake in Tammela, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Jänijärvi?: Jänijärvi in Tammela, Finland has official water-quality measurements, shown as reported. Water clarity: 0.6 m visibility. Phosphorus: 43 µg/L. Chlorophyll-a (algae): 30 µg/L. Maximum depth: 14.4 ft.
Is Jänijärvi safe to swim in?: Jänijärvi 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 Jänijärvi?: Jänijärvi has a maximum depth of 14.4 feet.

Explore Jänijärvi across LakeQuality

Lake Fishing Forecast

Species activity outlook by water temperature and season

More lakes in Finland

Lakes in Finland

Official water quality for lakes in Finland

Lake water quality by country

EU bathing ratings and named-lake measurements

Where this data comes from

25 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-vesla25 samples · 2018–2024

Analytical methods

SYKE VESLA

Monitoring station identifiers (1)

65451

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