Where is Suurijärvi?

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

Is Suurijärvi safe to swim in?

Suurijärvi 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.

Suurijärvi

Heinola, FinlandView map Directions

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

Clarity

4 m

Clearer than most

Secchi · sampled 2026

Phosphorus

5 µg/L

Less phosphorus than most

Measured by Syke

Chlorophyll-a

4.3 µg/L

Less algae than most

Measured by Syke

Limited data

See the measurements Directions Where to stay

Suurijärvi in Heinola, Finland has official water-quality measurements, shown as reported. Water clarity: 4 m visibility. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 4.3 µg/L.

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How Suurijärvi is classified

Suurijärvi 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.

Suurijärvi is a lake in Heinola County, Finland.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2026-07-27. Methodology: how these readings are compared.

What Suurijärvi is good for

From access and monitoring records, not editorial picks.

Clear water13 ft of visibility

Swimming conditions

No reading

Limited data

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Suurijärvi 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 Suurijärvi

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

Good clarity, visible to about 13 ft. Phosphorus 5 µg/L. Chlorophyll-a 4.3 µg/L. TSI 37.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	3.95m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	5µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	4.3µg/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.	37	Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Low nutrients, clear water. No reading is a swimming clearance.

Ask about Suurijärvi

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

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Fishing Suurijärvi

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

Frequently asked questions about Suurijärvi

Where is Suurijärvi?: Suurijärvi is a lake in Heinola, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Suurijärvi?: Suurijärvi in Heinola, Finland has official water-quality measurements, shown as reported. Water clarity: 4 m visibility. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 4.3 µg/L.
Is Suurijärvi safe to swim in?: Suurijärvi 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.

Explore Suurijärvi across LakeQuality

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Where this data comes from

6 measurements from 1 monitoring station, 2019–2026. 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-vesla6 samples · 2019–2026

Analytical methods

SYKE VESLA

Monitoring station identifiers (1)

68745

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