Žirnajai Lake
Žirnajai Lake in Vilniaus, Lithuania has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.4 m visibility. Chlorophyll-a (algae): 5.1 µg/L.
- Clarity
- 2.4 m
Why Žirnajai Lake has no A–F grade
Žirnajai Lake in Lithuania 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 algae (chlorophyll-a), but not phosphorus.
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 Environmental Protection Agency of Lithuania (Aplinkos apsaugos agentūra).
Žirnajai Lake is a lake in Vilniaus County, Lithuania.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2019-10-03. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Žirnajai Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Moderate clarity, visible to about 7.7 ft. Chlorophyll-a: 5.1 µg/L. Trophic State Index: 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.35 m | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 5.1 µg/L | Not graded |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Žirnajai Lake
Compare lakeside cabins, hotels, and vacation rentals near Žirnajai Lake in Vilniaus, Lithuania — 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.
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Fishing Žirnajai Lake
Frequently asked questions about Žirnajai Lake
What is the water quality of Žirnajai Lake?
- Žirnajai Lake in Vilniaus, Lithuania has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.4 m visibility. Chlorophyll-a (algae): 5.1 µg/L.
Is Žirnajai Lake safe to swim in?
- Žirnajai Lake 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
8 measurements from 1 monitoring station, 2019. Retrieved from Lithuanian lake state monitoring (AAA; not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Environmental Protection Agency of Lithuania (Aplinkos apsaugos agentūra)
aaa-lt8 samples · 2019
Analytical methods
- AAA lake state monitoring
Monitoring station identifiers (1)
LTL154
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: 2019-10-03
Monitoring stations: 1