Where is Mustajärvi?

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

Is Mustajärvi safe to swim in?

Mustajärvi 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 Mustajärvi?

Mustajärvi has a maximum depth of 10.8 feet.

Mustajärvi

Sonkajärvi, FinlandView map Directions

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

Clarity

0.8 m

Murkier than most

Secchi · sampled 2022

Phosphorus

24 µg/L

Typical for Finland

Measured by Syke

Chlorophyll-a

14.5 µg/L

Typical for Finland

Measured by Syke

Max depth

3.3 m

Bathymetric survey

11 ft max depth
Limited data

See the measurements Directions Where to stay

Mustajärvi in Sonkajärvi, Finland has official water-quality measurements, shown as reported. Water clarity: 0.8 m visibility. Phosphorus: 24 µg/L. Chlorophyll-a (algae): 14.5 µg/L. Maximum depth: 10.8 ft.

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How Mustajärvi is classified

Mustajärvi 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.

Mustajärvi is a lake in Sonkajärvi County, Finland with a maximum depth of 11 feet.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2022-07-25. 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 Mustajärvi 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 Mustajärvi

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

Very murky, less than 2.6 ft of visibility. Phosphorus 24 µg/L. Chlorophyll-a 14.5 µg/L. TSI 57.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	0.8m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	24µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	14.5µg/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.	57	Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic

High nutrients, frequent algae, reduced clarity

Ask about Mustajärvi

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

Lake Details

Max depth

3.3 m

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Fishing Mustajärvi

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

Frequently asked questions about Mustajärvi

Where is Mustajärvi?: Mustajärvi is a lake in Sonkajärvi, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Mustajärvi?: Mustajärvi in Sonkajärvi, Finland has official water-quality measurements, shown as reported. Water clarity: 0.8 m visibility. Phosphorus: 24 µg/L. Chlorophyll-a (algae): 14.5 µg/L. Maximum depth: 10.8 ft.
Is Mustajärvi safe to swim in?: Mustajärvi 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 Mustajärvi?: Mustajärvi has a maximum depth of 10.8 feet.

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Where this data comes from

9 measurements from 1 monitoring station, 2016–2022. 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-vesla9 samples · 2016–2022

Analytical methods

SYKE VESLA

Monitoring station identifiers (1)

19238

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