Marsjön Lake
Inkoo, FinlandView mapDirections
Syke publishes the water-quality measurements for Marsjön Lake. Here is what has been measured.
- 30 ft max depth
- Limited data
Marsjön Lake in Inkoo, Finland has official water-quality measurements, shown as reported. Water clarity: 1.6 m visibility. Phosphorus: 22 µg/L. Chlorophyll-a (algae): 7.7 µg/L. Maximum depth: 29.9 ft.
How Marsjön Lake is classified
Marsjön Lake 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.
Marsjön Lake is a lake in Inkoo County, Finland with a maximum depth of 30 feet.
Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2025-10-30. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Marsjön Lake 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.
Water quality measurements for Marsjön Lake
These are the measurements Syke publishes for Marsjön Lake. More on the source.
Murky, only visible to about 5.1 ft. Phosphorus 22 µg/L. Chlorophyll-a 7.7 µg/L. TSI 51.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.55m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 22µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 7.7µg/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. | 51 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Marsjön Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
9.1 m
Stays via Stay22
Stays near Marsjön Lake
Compare lakeside cabins, hotels, and vacation rentals near Marsjön Lake in Inkoo, Finland — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Marsjön Lake
Prices for Oct 2–4, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Follow Marsjön Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Marsjön Lake
Frequently asked questions about Marsjön Lake
Where is Marsjön Lake?
- Marsjön Lake is a lake in Inkoo, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Marsjön Lake?
- Marsjön Lake in Inkoo, Finland has official water-quality measurements, shown as reported. Water clarity: 1.6 m visibility. Phosphorus: 22 µg/L. Chlorophyll-a (algae): 7.7 µg/L. Maximum depth: 29.9 ft.
Is Marsjön Lake safe to swim in?
- Marsjön Lake 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 Marsjön Lake?
- Marsjön Lake has a maximum depth of 29.9 feet.
Explore Marsjön Lake across LakeQuality
More lakes in Finland
Where this data comes from
30 measurements from 1 monitoring station, 2016–2025. Retrieved from Syke VESLA (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Finnish Environment Institute (Syke) and ELY Centres
syke-vesla30 samples · 2016–2025
Analytical methods
- SYKE VESLA
Monitoring station identifiers (1)
82543
Authority classifications are shown as the authority published them. See where the data comes from and data sources.