Where is Ahvenaiset Lake?

Ahvenaiset Lake is a lake in Hollola, Finland. This page reports official water-quality measurements, shown as reported.

Is Ahvenaiset Lake safe to swim in?

Ahvenaiset 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 Ahvenaiset Lake?

Ahvenaiset Lake has a maximum depth of 65.6 feet.

Ahvenaiset Lake

Hollola, FinlandView map Directions

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

Clarity

4.6 m

Clearer than most

Secchi · sampled 2026

Phosphorus

11 µg/L

Typical for Finland

Measured by Syke

Chlorophyll-a

4.3 µg/L

Less algae than most

Measured by Syke

Max depth

20 m

Bathymetric survey

66 ft max depth
Limited data

See the measurements Directions Where to stay

Ahvenaiset Lake in Hollola, Finland has official water-quality measurements, shown as reported. Water clarity: 4.6 m visibility. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 4.3 µg/L. Maximum depth: 65.6 ft.

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How Ahvenaiset Lake is classified

Ahvenaiset 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.

Ahvenaiset Lake is a lake in Hollola County, Finland with a maximum depth of 66 feet.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2026-03-16. Methodology: how these readings are compared.

What Ahvenaiset Lake is good for

From access and monitoring records, not editorial picks.

Clear water15.1 ft of visibility
Deep water65.6 ft surveyed max depth

Swimming conditions

No reading

Limited data

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

Whether Ahvenaiset 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.

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Water quality measurements for Ahvenaiset Lake

These are the measurements Syke publishes for Ahvenaiset Lake. More on the source.

Crystal clear, you can see 15.1 ft down. Phosphorus 11 µg/L. Chlorophyll-a 4.3 µg/L. TSI 41.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	4.6m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	11µg/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.	41	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Ahvenaiset Lake

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

Lake Details

Max depth

20 m

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Stays near Ahvenaiset Lake

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Fishing Ahvenaiset Lake

→ Ahvenaiset Lake fishing regulations (limits, seasons, special rules)

Frequently asked questions about Ahvenaiset Lake

Where is Ahvenaiset Lake?: Ahvenaiset Lake is a lake in Hollola, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Ahvenaiset Lake?: Ahvenaiset Lake in Hollola, Finland has official water-quality measurements, shown as reported. Water clarity: 4.6 m visibility. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 4.3 µg/L. Maximum depth: 65.6 ft.
Is Ahvenaiset Lake safe to swim in?: Ahvenaiset 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 Ahvenaiset Lake?: Ahvenaiset Lake has a maximum depth of 65.6 feet.

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Where this data comes from

7 measurements from 1 monitoring station, 2022–2026. 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-vesla7 samples · 2022–2026

Analytical methods

SYKE VESLA

Monitoring station identifiers (1)

44571

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