Peräjärvi
Posio, FinlandView mapDirections
Syke publishes the water-quality measurements for Peräjärvi. Here is what has been measured.
- Limited data
Peräjärvi in Posio, Finland has official water-quality measurements, shown as reported. Water clarity: 1.5 m visibility. Phosphorus: 16 µg/L. Chlorophyll-a (algae): 10 µg/L.
How Peräjärvi is classified
Peräjärvi 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.
Peräjärvi is a lake in Posio County, Finland.
Source: the Finnish Environment Institute (Syke) and the ELY Centres — not the EPA Water Quality Portal, last sampled 2022-07-18. 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 Peräjärvi 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 Peräjärvi
These are the measurements Syke publishes for Peräjärvi. More on the source.
Murky, only visible to about 4.9 ft. Phosphorus 16 µg/L. Chlorophyll-a 10 µg/L. TSI 50.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.5m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 16µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 10µg/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. | 50 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Frequently asked questions about Peräjärvi
Where is Peräjärvi?
- Peräjärvi is a lake in Posio, Finland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Peräjärvi?
- Peräjärvi in Posio, Finland has official water-quality measurements, shown as reported. Water clarity: 1.5 m visibility. Phosphorus: 16 µg/L. Chlorophyll-a (algae): 10 µg/L.
Is Peräjärvi safe to swim in?
- Peräjärvi 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 Peräjärvi?
- The available depth estimate for Peräjärvi is shallower than its measured water clarity, which cannot be right, so no depth is shown.
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Where this data comes from
3 measurements from 1 monitoring station, 2022. 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-vesla3 samples · 2022
Analytical methods
- SYKE VESLA
Monitoring station identifiers (1)
37204
Authority classifications are shown as the authority published them. See where the data comes from and data sources.