Undu Laht Lake
Undu Laht Lake in Saare, Estonia has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.2 m visibility. Phosphorus: 25.5 µg/L. Chlorophyll-a (algae): 5.8 µg/L. Surface area: 565.6 acres.
- Clarity
- 1.2 m
- Area
- 229 ha
Why Undu Laht Lake has no A–F grade
Undu Laht Lake in Estonia 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 Estonian Environment Agency (Keskkonnaagentuur).
Undu Laht Lake is a 566-acre lake in Saare County, Estonia.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-09-23. 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 Undu Laht Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 3.8 ft. Phosphorus level: 25.5 µg/L. Chlorophyll-a: 5.8 µg/L. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.15 m | Not graded |
| Phosphorus | 25.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 5.8 µg/L | Not graded |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 229 ha |
The available depth estimate for Undu Laht Lake is shallower than its measured water clarity, which cannot be right, so no depth is shown.
Where to stay near Undu Laht Lake
Compare lakeside cabins, hotels, and vacation rentals near Undu Laht Lake in Saare, Estonia — 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 Undu Laht Lake
Frequently asked questions about Undu Laht Lake
What is the water quality of Undu Laht Lake?
- Undu Laht Lake in Saare, Estonia has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.2 m visibility. Phosphorus: 25.5 µg/L. Chlorophyll-a (algae): 5.8 µg/L. Surface area: 565.6 acres.
Is Undu Laht Lake safe to swim in?
- Undu Laht 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.
How deep is Undu Laht Lake?
- The available depth estimate for Undu Laht Lake is shallower than its measured water clarity, which cannot be right, so no depth is shown. The lake covers 565.6 acres.
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Where this data comes from
24 measurements from 2 monitoring stations, 2018–2024. Retrieved from KESE / Estonian Environment Agency (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Estonian Environment Agency (Keskkonnaagentuur)
kese-ee24 samples · 2018–2024
Analytical methods
- KESE I-level monitoring
Monitoring station identifiers (2)
SJA5129003SJA5129000
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: 2024-09-23
Monitoring stations: 2