Stirtos Lake
Stirtos Lake in Alytaus, Lithuania has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 3.2 m visibility. Phosphorus: 34.5 µg/L. Chlorophyll-a (algae): 7.3 µg/L.
- Clarity
- 3.2 m
Why Stirtos Lake has no A–F grade
Stirtos 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).
Stirtos Lake is a lake in Alytaus County, Lithuania.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2018-09-19. 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 Stirtos Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 10.3 ft. Phosphorus level: 34.5 µg/L. Chlorophyll-a: 7.3 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.15 m | Not graded |
| Phosphorus | 34.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 7.3 µg/L | Not graded |
| Trophic State Index (TSI) | 50 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Stirtos Lake
Compare lakeside cabins, hotels, and vacation rentals near Stirtos Lake in Alytaus, 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 Stirtos Lake
Frequently asked questions about Stirtos Lake
What is the water quality of Stirtos Lake?
- Stirtos Lake in Alytaus, Lithuania has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 3.2 m visibility. Phosphorus: 34.5 µg/L. Chlorophyll-a (algae): 7.3 µg/L.
Is Stirtos Lake safe to swim in?
- Stirtos 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 Stirtos Lake across LakeGrade
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Where this data comes from
12 measurements from 1 monitoring station, 2018. 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-lt12 samples · 2018
Analytical methods
- AAA lake state monitoring
Monitoring station identifiers (1)
LTL517
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: 2018-09-19
Monitoring stations: 1