Ilgis Lake
Ilgis Lake in Šiaulių, Lithuania has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.2 m visibility. Phosphorus: 18 µg/L. Chlorophyll-a (algae): 4 µg/L.
- Clarity
- 2.2 m
Why Ilgis Lake has no A–F grade
Ilgis 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).
Ilgis Lake is a lake in Šiaulių County, Lithuania.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-10-06. Grade methodology: LakeGrade methodology.
Watch Ilgis Lake 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 Ilgis Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Moderate clarity, visible to about 7.2 ft. Phosphorus level: 18 µg/L. Chlorophyll-a: 4 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.2 m | Not graded |
| Phosphorus | 18 µg/L | Not graded |
| Chlorophyll-a (Algae) | 4 µg/L | Not graded |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Ilgis Lake
Compare lakeside cabins, hotels, and vacation rentals near Ilgis Lake in Šiaulių, 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.
Top-rated places to stay near Ilgis Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Fishing Ilgis Lake
Frequently asked questions about Ilgis Lake
What is the water quality of Ilgis Lake?
- Ilgis Lake in Šiaulių, Lithuania has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.2 m visibility. Phosphorus: 18 µg/L. Chlorophyll-a (algae): 4 µg/L.
Is Ilgis Lake safe to swim in?
- Ilgis 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 Ilgis Lake across LakeGrade
More lakes in Lithuania
Where this data comes from
96 measurements from 1 monitoring station, 2017–2021. 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-lt96 samples · 2017–2021
Analytical methods
- AAA lake state monitoring
Monitoring station identifiers (1)
LTL204
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: 2021-10-06
Monitoring stations: 1