Where is Hietasenjärvi?

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

Is Hietasenjärvi safe to swim in?

Hietasenjärvi 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 Hietasenjärvi?

Hietasenjärvi has a maximum depth of 10.5 feet.

Hietasenjärvi

Mäntyharju, FinlandView map Directions

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

Clarity

1.7 m

Typical for Finland

Secchi · sampled 2020

Phosphorus

12 µg/L

Typical for Finland

Measured by Syke

Chlorophyll-a

27 µg/L

More algae than most

Measured by Syke

Max depth

3.2 m

Bathymetric survey

11 ft max depth
Limited data

See the measurements Directions Where to stay

Hietasenjärvi in Mäntyharju, Finland has official water-quality measurements, shown as reported. Water clarity: 1.7 m visibility. Phosphorus: 12 µg/L. Chlorophyll-a (algae): 27 µg/L. Maximum depth: 10.5 ft.

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How Hietasenjärvi is classified

Hietasenjärvi 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.

Hietasenjärvi is a lake in Mäntyharju 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 2020-11-04. 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 Hietasenjärvi 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 Hietasenjärvi

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

Murky, only visible to about 5.6 ft. Phosphorus 12 µg/L. Chlorophyll-a 27 µg/L. TSI 52.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	1.7m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	12µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	27µg/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.	52	Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic

High nutrients, frequent algae, reduced clarity

Ask about Hietasenjärvi

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

Lake Details

Max depth

3.2 m

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Fishing Hietasenjärvi

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

Frequently asked questions about Hietasenjärvi

Where is Hietasenjärvi?: Hietasenjärvi is a lake in Mäntyharju, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Hietasenjärvi?: Hietasenjärvi in Mäntyharju, Finland has official water-quality measurements, shown as reported. Water clarity: 1.7 m visibility. Phosphorus: 12 µg/L. Chlorophyll-a (algae): 27 µg/L. Maximum depth: 10.5 ft.
Is Hietasenjärvi safe to swim in?: Hietasenjärvi 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 Hietasenjärvi?: Hietasenjärvi has a maximum depth of 10.5 feet.

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Where this data comes from

10 measurements from 1 monitoring station, 2020. 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-vesla10 samples · 2020

Analytical methods

SYKE VESLA

Monitoring station identifiers (1)

14885

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