Where is Ruostejärvi?

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

Is Ruostejärvi safe to swim in?

Ruostejärvi 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 Ruostejärvi?

Ruostejärvi has a maximum depth of 30.8 feet.

Ruostejärvi

Tammela, FinlandView map Directions

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

Clarity

2.3 m

Clearer than most

Secchi · sampled 2026

Phosphorus

9 µg/L

Less phosphorus than most

Measured by Syke

Chlorophyll-a

5.5 µg/L

Typical for Finland

Measured by Syke

Max depth

9.4 m

Bathymetric survey

31 ft max depth
Limited data

See the measurements Directions Where to stay

Ruostejärvi in Tammela, Finland has official water-quality measurements, shown as reported. Water clarity: 2.3 m visibility. Phosphorus: 9 µg/L. Chlorophyll-a (algae): 5.5 µg/L. Maximum depth: 30.8 ft.

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How Ruostejärvi is classified

Ruostejärvi 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.

Ruostejärvi is a lake in Tammela County, Finland with a maximum depth of 31 feet.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2026-03-12. Methodology: how these readings are compared.

What Ruostejärvi is good for

From access and monitoring records, not editorial picks.

Deep water30.8 ft surveyed max depth

Swimming conditions

No reading

Limited data

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

Whether Ruostejärvi 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 Ruostejärvi

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

Moderate clarity, visible to about 7.5 ft. Phosphorus 9 µg/L. Chlorophyll-a 5.5 µg/L. TSI 44.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	2.3m	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)	5.5µg/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.	44	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Ruostejärvi

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

Lake Details

Max depth

9.4 m

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Stays near Ruostejärvi

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Fishing Ruostejärvi

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

Frequently asked questions about Ruostejärvi

Where is Ruostejärvi?: Ruostejärvi is a lake in Tammela, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Ruostejärvi?: Ruostejärvi in Tammela, Finland has official water-quality measurements, shown as reported. Water clarity: 2.3 m visibility. Phosphorus: 9 µg/L. Chlorophyll-a (algae): 5.5 µg/L. Maximum depth: 30.8 ft.
Is Ruostejärvi safe to swim in?: Ruostejärvi 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 Ruostejärvi?: Ruostejärvi has a maximum depth of 30.8 feet.

Explore Ruostejärvi across LakeQuality

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EU bathing ratings and named-lake measurements

Where this data comes from

77 measurements from 3 monitoring stations, 2016–2026. 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-vesla77 samples · 2016–2026

Analytical methods

SYKE VESLA

Monitoring station identifiers (3)

2500
2501
91768

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