Hallsjon
Hallsjon in Unknown, Sweden has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 3.2 m visibility. Phosphorus: 6.7 µg/L. Chlorophyll-a (algae): 2.2 µg/L.
- Clarity
- 3.2 m
Why Hallsjon has no A–F grade
Hallsjon in Sweden is published with the authority's own measurements, not a LakeQuality letter. official authority class; not a LakeQuality A–F letter Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
A letter on the LakeQuality scale would be an invention, not an official class. Everything below that has been measured is still reported on this page.
Monitoring: the Swedish Agency for Marine and Water Management, via UNEP GEMS/Water.
Hallsjon is a lake in Unknown County, Sweden.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-10-17. Grade methodology: LakeGrade methodology.
Watch Hallsjon water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Hallsjon
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 10.5 ft. Phosphorus level: 6.7 µg/L. Chlorophyll-a: 2.2 µg/L. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.2 m | Not graded |
| Phosphorus | 6.7 µg/L | Not graded |
| Chlorophyll-a (Algae) | 2.2 µg/L | Not graded |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Hallsjon
Compare lakeside cabins, hotels, and vacation rentals near Hallsjon in Unknown, Sweden — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Hallsjon
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Fishing Hallsjon
Frequently asked questions about Hallsjon
What is the water quality of Hallsjon?
- Hallsjon in Unknown, Sweden has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 3.2 m visibility. Phosphorus: 6.7 µg/L. Chlorophyll-a (algae): 2.2 µg/L.
Is Hallsjon safe to swim in?
- Hallsjon 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.
Explore Hallsjon across LakeGrade
More lakes in Sweden
Where this data comes from
69 measurements from 1 monitoring station, 2016–2021. Retrieved from UNEP GEMS/Water GFQA (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- European Environment Agency
europeanenvironmentagenc69 samples · —
Analytical methods
- GEMStat OPEN / CC BY 4.0
Monitoring station identifiers (1)
SWE00254
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See methodology and data sources.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2021-10-17
Monitoring stations: 1