Where is Tohtaanjärvi?

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

Is Tohtaanjärvi safe to swim in?

Tohtaanjärvi 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.

Tohtaanjärvi

Hartola, FinlandView map Directions

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

Clarity

2.3 m

Clearer than most

Secchi · sampled 2023

Phosphorus

5 µg/L

Less phosphorus than most

Measured by Syke

Chlorophyll-a

3.4 µg/L

Less algae than most

Measured by Syke

Limited data

See the measurements Directions Where to stay

Tohtaanjärvi in Hartola, Finland has official water-quality measurements, shown as reported. Water clarity: 2.3 m visibility. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 3.4 µg/L.

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How Tohtaanjärvi is classified

Tohtaanjärvi 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.

Tohtaanjärvi is a lake in Hartola County, Finland.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2023-08-30. 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 Tohtaanjärvi 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 Tohtaanjärvi

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

Moderate clarity, visible to about 7.5 ft. Phosphorus 5 µg/L. Chlorophyll-a 3.4 µg/L. TSI 39.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	2.3m	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)	3.4µg/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.	39	Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic

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

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

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Fishing Tohtaanjärvi

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

Frequently asked questions about Tohtaanjärvi

Where is Tohtaanjärvi?: Tohtaanjärvi is a lake in Hartola, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Tohtaanjärvi?: Tohtaanjärvi in Hartola, Finland has official water-quality measurements, shown as reported. Water clarity: 2.3 m visibility. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 3.4 µg/L.
Is Tohtaanjärvi safe to swim in?: Tohtaanjärvi 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.

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Where this data comes from

3 measurements from 1 monitoring station, 2023. 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-vesla3 samples · 2023

Analytical methods

SYKE VESLA

Monitoring station identifiers (1)

82068

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