Suurlaht Lake
Suurlaht Lake in Saare, Estonia has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.3 m visibility. Phosphorus: 22 µg/L. Chlorophyll-a (algae): 4.7 µg/L. Maximum depth: 8.9 ft. Surface area: 1332.4 acres.
- Clarity
- 1.3 m
- Max depth
- 2.7 m
- Area
- 539 ha
Why Suurlaht Lake has no A–F grade
Suurlaht 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).
Suurlaht Lake is a 1,332-acre lake in Saare County, Estonia with a maximum depth of 9 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-09-16. 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 Suurlaht Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 4.3 ft. Phosphorus level: 22 µg/L. Chlorophyll-a: 4.7 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.3 m | Not graded |
| Phosphorus | 22 µg/L | Not graded |
| Chlorophyll-a (Algae) | 4.7 µg/L | Not graded |
| Trophic State Index (TSI) | 50 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 2.7 m |
| Surface Area | 539 ha |
Where to stay near Suurlaht Lake
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Fishing Suurlaht Lake
Frequently asked questions about Suurlaht Lake
What is the water quality of Suurlaht Lake?
- Suurlaht Lake in Saare, Estonia has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.3 m visibility. Phosphorus: 22 µg/L. Chlorophyll-a (algae): 4.7 µg/L. Maximum depth: 8.9 ft. Surface area: 1332.4 acres.
Is Suurlaht Lake safe to swim in?
- Suurlaht 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 Suurlaht Lake?
- Suurlaht Lake has a maximum depth of 8.9 feet. The lake covers 1332.4 acres.
Explore Suurlaht Lake across LakeGrade
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Where this data comes from
130 measurements from 2 monitoring stations, 2016–2025. 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-ee130 samples · 2016–2025
Analytical methods
- KESE I-level monitoring
Monitoring station identifiers (2)
SJA1985000SJA1985005
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: 2025-09-16
Monitoring stations: 2