Where is Merrasjärvi?

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

Is Merrasjärvi safe to swim in?

Merrasjärvi 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 Merrasjärvi?

Merrasjärvi has a maximum depth of 6.6 feet.

Merrasjärvi

Lahti, FinlandView map Directions

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

Clarity

1.1 m

Typical for Finland

Secchi · sampled 2025

Phosphorus

27 µg/L

Typical for Finland

Measured by Syke

Chlorophyll-a

28 µg/L

More algae than most

Measured by Syke

Max depth

2 m

Bathymetric survey

7 ft max depth
Limited data

See the measurements Directions Where to stay

Merrasjärvi in Lahti, Finland has official water-quality measurements, shown as reported. Water clarity: 1.1 m visibility. Phosphorus: 27 µg/L. Chlorophyll-a (algae): 28 µg/L. Maximum depth: 6.6 ft.

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How Merrasjärvi is classified

Merrasjärvi 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.

Merrasjärvi is a lake in Lahti County, Finland with a maximum depth of 7 feet.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2025-08-19. 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 Merrasjärvi 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 Merrasjärvi

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

Murky, only visible to about 3.6 ft. Phosphorus 27 µg/L. Chlorophyll-a 28 µg/L. TSI 58.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	1.1m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	27µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	28µg/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.	58	Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic

High nutrients, frequent algae, reduced clarity

Ask about Merrasjärvi

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

Lake Details

Max depth

2 m

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Fishing Merrasjärvi

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

Frequently asked questions about Merrasjärvi

Where is Merrasjärvi?: Merrasjärvi is a lake in Lahti, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Merrasjärvi?: Merrasjärvi in Lahti, Finland has official water-quality measurements, shown as reported. Water clarity: 1.1 m visibility. Phosphorus: 27 µg/L. Chlorophyll-a (algae): 28 µg/L. Maximum depth: 6.6 ft.
Is Merrasjärvi safe to swim in?: Merrasjärvi 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 Merrasjärvi?: Merrasjärvi has a maximum depth of 6.6 feet.

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Where this data comes from

50 measurements from 1 monitoring station, 2016–2025. 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-vesla50 samples · 2016–2025

Analytical methods

SYKE VESLA

Monitoring station identifiers (1)

49493

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