Suurlaht is a lake in Saare, Estonia. This page reports official water-quality measurements, shown as reported.

Is Suurlaht safe to swim in?

Suurlaht 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?

Suurlaht has a maximum depth of 8.9 feet. The lake covers 1332.4 acres.

Suurlaht

Saare, Estonia539 haView map Directions

KAUR publishes the water-quality measurements for Suurlaht. Here is what has been measured.

Clarity

1.3 m

Typical for Estonia

Secchi · sampled 2025

Phosphorus

22 µg/L

Less phosphorus than most

Measured by KAUR

Chlorophyll-a

4.7 µg/L

Typical for Estonia

Measured by KAUR

Max depth

2.7 m

Bathymetric survey

Area

539 ha

Surface area

9 ft max depth
Limited data

See the measurements Directions Where to stay

Suurlaht in Saare, Estonia has official water-quality measurements, shown as reported. 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.

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How Suurlaht is classified

Suurlaht in Estonia is published with the authority's own measurements and class. The measurements here are published by the agency that samples the lake, as reported. Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).

LakeQuality publishes no grade of its own beside it. Everything below thathas been measured is reported on this page.

Monitoring: the Estonian Environment Agency (Keskkonnaagentuur).

Suurlaht is a 1,332-acre lake in Saare County, Estonia with a maximum depth of 9 feet.

Source: the Estonian Environment Agency (Keskkonnaagentuur) — not the EPA Water Quality Portal, last sampled 2025-09-16. Methodology: how these readings are compared.

What Suurlaht is good for

From access and monitoring records, not editorial picks.

Big water1,332 acres

Swimming conditions

No reading

Limited data

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Suurlaht is safe to swim in today is a call for the Estonian Environment Agency (Keskkonnaagentuur) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Suurlaht

These are the measurements KAUR publishes for Suurlaht. More on the source.

Murky, only visible to about 4.3 ft. Phosphorus 22 µg/L. Chlorophyll-a 4.7 µg/L. TSI 50.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	1.3m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	22µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	4.7µg/L	Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water.
Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a.	50	Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic

High nutrients, frequent algae, reduced clarity

Ask about Suurlaht

Answers come straight from the public measurements and survey records on this page.

Lake Details

Max depth

2.7 m

Surface area

539 ha

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Fishing Suurlaht

→ Suurlaht fishing regulations (limits, seasons, special rules)

Frequently asked questions about Suurlaht

Where is Suurlaht?: Suurlaht is a lake in Saare, Estonia. This page reports official water-quality measurements, shown as reported.
What is the water quality of Suurlaht?: Suurlaht in Saare, Estonia has official water-quality measurements, shown as reported. 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 safe to swim in?: Suurlaht 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?: Suurlaht has a maximum depth of 8.9 feet. The lake covers 1332.4 acres.

Explore Suurlaht across LakeQuality

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Species activity outlook by water temperature and season

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EU bathing ratings and named-lake measurements

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)

SJA1985000
SJA1985005

Authority classifications are shown as the authority published them. See where the data comes from and data sources.