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

Is Hiijärvi safe to swim in?

Hiijärvi 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 Hiijärvi?

The available depth estimate for Hiijärvi is shallower than its measured water clarity, which cannot be right, so no depth is shown.

Hiijärvi

Luumäki, FinlandView map Directions

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

Clarity

2.7 m

Clearer than most

Secchi · sampled 2021

Phosphorus

11.7 µg/L

Typical for Finland

Measured by Syke

Limited data

See the measurements Directions Where to stay

Hiijärvi in Luumäki, Finland has official water-quality measurements, shown as reported. Water clarity: 2.7 m visibility. Phosphorus: 11.7 µg/L.

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How Hiijärvi is classified

Hiijärvi 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 and phosphorus, but not 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.

Hiijärvi is a lake in Luumäki County, Finland.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2021-09-02. 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 Hiijärvi 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 Hiijärvi

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

Moderate clarity, visible to about 8.9 ft. Phosphorus 11.7 µg/L. TSI 43.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	2.7m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	11.7µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)		No reading 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.	43	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Hiijärvi

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

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Stays near Hiijärvi

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Fishing Hiijärvi

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

Frequently asked questions about Hiijärvi

Where is Hiijärvi?: Hiijärvi is a lake in Luumäki, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Hiijärvi?: Hiijärvi in Luumäki, Finland has official water-quality measurements, shown as reported. Water clarity: 2.7 m visibility. Phosphorus: 11.7 µg/L.
Is Hiijärvi safe to swim in?: Hiijärvi 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 Hiijärvi?: The available depth estimate for Hiijärvi is shallower than its measured water clarity, which cannot be right, so no depth is shown.

Explore Hiijärvi across LakeQuality

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Where this data comes from

4 measurements from 1 monitoring station, 2021. 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-vesla4 samples · 2021

Analytical methods

SYKE VESLA

Monitoring station identifiers (1)

11851

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