Ilgajis Lake
Ilgajis Lake in Vilniaus, Lithuania has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.7 m visibility. Phosphorus: 24 µg/L. Chlorophyll-a (algae): 17.6 µg/L.
- Clarity
- 0.7 m
Why Ilgajis Lake has no A–F grade
Ilgajis 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, 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 Environmental Protection Agency of Lithuania (Aplinkos apsaugos agentūra).
Ilgajis Lake is a lake in Vilniaus County, Lithuania.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2019-10-09. 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 Ilgajis Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 2.1 ft of visibility. Phosphorus level: 24 µg/L. Chlorophyll-a: 17.6 µg/L. Trophic State Index: 58.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.65 m | Not graded |
| Phosphorus | 24 µg/L | Not graded |
| Chlorophyll-a (Algae) | 17.6 µg/L | Not graded |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Ilgajis Lake
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Fishing Ilgajis Lake
Frequently asked questions about Ilgajis Lake
What is the water quality of Ilgajis Lake?
- Ilgajis Lake in Vilniaus, Lithuania has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.7 m visibility. Phosphorus: 24 µg/L. Chlorophyll-a (algae): 17.6 µg/L.
Is Ilgajis Lake safe to swim in?
- Ilgajis 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.
Explore Ilgajis Lake across LakeGrade
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Where this data comes from
23 measurements from 1 monitoring station, 2017–2019. 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-lt23 samples · 2017–2019
Analytical methods
- AAA lake state monitoring
Monitoring station identifiers (1)
LTL279
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: 2019-10-09
Monitoring stations: 1