Where is Iso Allasjärvi?

Iso Allasjärvi is a lake in Alavus, Finland. This page reports official water-quality measurements, shown as reported.

Is Iso Allasjärvi safe to swim in?

Iso Allasjärvi 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 Iso Allasjärvi?

Iso Allasjärvi has a maximum depth of 4.3 feet.

Iso Allasjärvi

Alavus, FinlandView map Directions

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

Clarity

0.6 m

Murkier than most

Secchi · sampled 2026

Phosphorus

53 µg/L

More phosphorus than most

Measured by Syke

Chlorophyll-a

24 µg/L

More algae than most

Measured by Syke

Max depth

1.3 m

Bathymetric survey

4 ft max depth
Limited data

See the measurements Directions Where to stay

Iso Allasjärvi in Alavus, Finland has official water-quality measurements, shown as reported. Water clarity: 0.6 m visibility. Phosphorus: 53 µg/L. Chlorophyll-a (algae): 24 µg/L. Maximum depth: 4.3 ft.

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How Iso Allasjärvi is classified

Iso Allasjärvi 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.

Iso Allasjärvi is a lake in Alavus County, Finland with a maximum depth of 4 feet.

Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2026-03-19. 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 Iso Allasjärvi 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 Iso Allasjärvi

These are the measurements Syke publishes for Iso Allasjärvi. More on the source.

Very murky, less than 2 ft of visibility. Phosphorus 53 µg/L. Chlorophyll-a 24 µg/L. TSI 64.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	0.6m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	53µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	24µg/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.	64	Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic

High nutrients, frequent algae, reduced clarity

Ask about Iso Allasjärvi

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

Lake Details

Max depth

1.3 m

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Fishing Iso Allasjärvi

→ Iso Allasjärvi fishing regulations (limits, seasons, special rules)

Frequently asked questions about Iso Allasjärvi

Where is Iso Allasjärvi?: Iso Allasjärvi is a lake in Alavus, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Iso Allasjärvi?: Iso Allasjärvi in Alavus, Finland has official water-quality measurements, shown as reported. Water clarity: 0.6 m visibility. Phosphorus: 53 µg/L. Chlorophyll-a (algae): 24 µg/L. Maximum depth: 4.3 ft.
Is Iso Allasjärvi safe to swim in?: Iso Allasjärvi 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 Iso Allasjärvi?: Iso Allasjärvi has a maximum depth of 4.3 feet.

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Where this data comes from

29 measurements from 2 monitoring stations, 2018–2026. 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-vesla29 samples · 2018–2026

Analytical methods

SYKE VESLA

Monitoring station identifiers (2)

66580
4866

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