Where is Märkjärvi?

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

Is Märkjärvi safe to swim in?

Märkjärvi 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 Märkjärvi?

Märkjärvi has a maximum depth of 50.9 feet.

Märkjärvi

Iitti, FinlandView map Directions

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

Clarity

2.5 m

Clearer than most

Secchi · sampled 2026

Phosphorus

16 µg/L

Typical for Finland

Measured by Syke

Chlorophyll-a

7.5 µg/L

Typical for Finland

Measured by Syke

Max depth

15.5 m

Bathymetric survey

51 ft max depth
Limited data

See the measurements Directions Where to stay

Märkjärvi in Iitti, Finland has official water-quality measurements, shown as reported. Water clarity: 2.5 m visibility. Phosphorus: 16 µg/L. Chlorophyll-a (algae): 7.5 µg/L. Maximum depth: 50.9 ft.

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How Märkjärvi is classified

Märkjärvi 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.

Märkjärvi is a lake in Iitti County, Finland with a maximum depth of 51 feet.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2026-07-15. Methodology: how these readings are compared.

What Märkjärvi is good for

From access and monitoring records, not editorial picks.

Deep water50.9 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 Märkjärvi 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 Märkjärvi

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

Moderate clarity, visible to about 8.2 ft. Phosphorus 16 µg/L. Chlorophyll-a 7.5 µg/L. TSI 47.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	2.5m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	16µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	7.5µg/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.	47	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Märkjärvi

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

Lake Details

Max depth

15.5 m

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Stays near Märkjärvi

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Fishing Märkjärvi

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

Frequently asked questions about Märkjärvi

Where is Märkjärvi?: Märkjärvi is a lake in Iitti, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Märkjärvi?: Märkjärvi in Iitti, Finland has official water-quality measurements, shown as reported. Water clarity: 2.5 m visibility. Phosphorus: 16 µg/L. Chlorophyll-a (algae): 7.5 µg/L. Maximum depth: 50.9 ft.
Is Märkjärvi safe to swim in?: Märkjärvi 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 Märkjärvi?: Märkjärvi has a maximum depth of 50.9 feet.

Explore Märkjärvi across LakeQuality

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Species activity outlook by water temperature and season

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EU bathing ratings and named-lake measurements

Where this data comes from

29 measurements from 1 monitoring station, 2017–2026. 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-vesla29 samples · 2017–2026

Analytical methods

SYKE VESLA

Monitoring station identifiers (1)

11665

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