Where is Ylemmäisjärvi?

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

Is Ylemmäisjärvi safe to swim in?

Ylemmäisjärvi 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 Ylemmäisjärvi?

Ylemmäisjärvi has a maximum depth of 9.8 feet.

Ylemmäisjärvi

Orimattila, FinlandView map Directions

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

Phosphorus

33 µg/L

More phosphorus than most

Measured by Syke

Chlorophyll-a

14 µg/L

Typical for Finland

Measured by Syke

Max depth

3 m

Bathymetric survey

10 ft max depth
Limited data

See the measurements Directions Where to stay

Ylemmäisjärvi in Orimattila, Finland has official water-quality measurements, shown as reported. Phosphorus: 33 µg/L. Chlorophyll-a (algae): 14 µg/L. Maximum depth: 9.8 ft.

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How Ylemmäisjärvi is classified

Ylemmäisjärvi 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 phosphorus and algae (chlorophyll-a), but not water clarity.

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.

Ylemmäisjärvi is a lake in Orimattila County, Finland with a maximum depth of 10 feet.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2026-06-08. 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 Ylemmäisjärvi 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 Ylemmäisjärvi

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

No clarity data. Phosphorus 33 µg/L. Chlorophyll-a 14 µg/L. TSI 56.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)		No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	33µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	14µg/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.	56	Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic

High nutrients, frequent algae, reduced clarity

Ask about Ylemmäisjärvi

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

Lake Details

Max depth

3 m

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Fishing Ylemmäisjärvi

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

Frequently asked questions about Ylemmäisjärvi

Where is Ylemmäisjärvi?: Ylemmäisjärvi is a lake in Orimattila, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Ylemmäisjärvi?: Ylemmäisjärvi in Orimattila, Finland has official water-quality measurements, shown as reported. Phosphorus: 33 µg/L. Chlorophyll-a (algae): 14 µg/L. Maximum depth: 9.8 ft.
Is Ylemmäisjärvi safe to swim in?: Ylemmäisjärvi 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 Ylemmäisjärvi?: Ylemmäisjärvi has a maximum depth of 9.8 feet.

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Where this data comes from

2 measurements from 1 monitoring station, 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-vesla2 samples · 2026

Analytical methods

SYKE VESLA

Monitoring station identifiers (1)

50808

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