Langsjon is a lake in Sweden. This page reports official water-quality measurements, shown as reported.

Is Langsjon safe to swim in?

Langsjon 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.

Langsjon

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HaV publishes the water-quality measurements for Langsjon. Here is what has been measured.

Clarity

1.5 m

Murkier than most

Secchi · sampled 2023

Phosphorus

9.7 µg/L

Typical for Sweden

Measured by HaV

Chlorophyll-a

3.3 µg/L

Typical for Sweden

Measured by HaV

Limited data

See the measurements Directions Where to stay

Langsjon in Sweden has official water-quality measurements, shown as reported. Water clarity: 1.5 m visibility. Phosphorus: 9.7 µg/L. Chlorophyll-a (algae): 3.3 µg/L.

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How Langsjon is classified

Langsjon in Sweden 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 Swedish Agency for Marine and Water Management, via UNEP GEMS/Water.

Langsjon is a lake in Unknown County, Sweden.

Source: the Swedish Agency for Marine and Water Management, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2023-10-11. 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 Langsjon is safe to swim in today is a call for the Swedish Agency for Marine and Water Management, via UNEP GEMS/Water and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Langsjon

These are the measurements HaV publishes for Langsjon. More on the source.

Murky, only visible to about 4.9 ft. Phosphorus 9.7 µg/L. Chlorophyll-a 3.3 µg/L. TSI 44.

Water quality readings
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	9.7µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	3.3µg/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.	44	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Langsjon

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

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Stays near Langsjon

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Fishing Langsjon

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

Frequently asked questions about Langsjon

Where is Langsjon?: Langsjon is a lake in Sweden. This page reports official water-quality measurements, shown as reported.
What is the water quality of Langsjon?: Langsjon in Sweden has official water-quality measurements, shown as reported. Water clarity: 1.5 m visibility. Phosphorus: 9.7 µg/L. Chlorophyll-a (algae): 3.3 µg/L.
Is Langsjon safe to swim in?: Langsjon 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.

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Where this data comes from

92 measurements from 1 monitoring station, 2016–2023. Retrieved from UNEP GEMS/Water GFQA (not the EPA Water Quality Portal) on 2026-08-16.

Collected and reported by

European Environment Agencyeuropeanenvironmentagenc92 samples · —

Analytical methods

GEMStat OPEN / CC BY 4.0

Monitoring station identifiers (1)

SWE00261

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