Jańsko
Jańsko in LW10062, Poland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.4 m visibility. Phosphorus: 4941 µg/L.
- Clarity
- 0.4 m
Why Jańsko has no A–F grade
Jańsko in Poland 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 and phosphorus, but not 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 Chief Inspectorate of Environmental Protection (Główny Inspektorat Ochrony Środowiska).
Jańsko is a lake in LW10062 County, Poland.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2026-06-18. Grade methodology: LakeGrade methodology.
Watch Jańsko 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 Jańsko
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 1.4 ft of visibility. Phosphorus level: 4941 µg/L. Trophic State Index: 100.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.43 m | Not graded |
| Phosphorus | 4941 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 100 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Jańsko
Compare lakeside cabins, hotels, and vacation rentals near Jańsko in LW10062, Poland — 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 Jańsko
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Fishing Jańsko
Frequently asked questions about Jańsko
What is the water quality of Jańsko?
- Jańsko in LW10062, Poland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.4 m visibility. Phosphorus: 4941 µg/L.
Is Jańsko safe to swim in?
- Jańsko 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 Jańsko across LakeGrade
More lakes in Poland
Where this data comes from
4 measurements from 1 monitoring station, 2026. Retrieved from GIOŚ lake monitoring (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Główny Inspektorat Ochrony Środowiska
gios-pjwp4 samples · —
Analytical methods
- GIOŚ PJWP lake monitoring
Monitoring station identifiers (1)
PL02S0402_2114
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: 2026-06-18
Monitoring stations: 1