Which lakes in Slovenia are best to swim in?

8 of 8 designated bathing waters in Slovenia are rated Excellent for 2025 under the EU Bathing Water Directive. That class measures E. coli and intestinal enterococci only — it is not a safety clearance.

Is it safe to swim in Slovenia lakes?

The official class is a bacteriological rating, not a safety clearance. It does not cover algal blooms, nutrients, water clarity, currents, or depth. Conditions change after heavy rain. Check local signage and the operator's current notices before entering the water.

How is lake water quality measured in Slovenia?

9 named lakes in Slovenia have official phosphorus and Secchi from the Slovenian Environment Agency (ARSO), via UNEP GEMS/Water, 2022–2023. These are the authority's own measurements, shown as reported.

Whose ratings do the Slovenia lake pages show?

The publishing authority's own. Pages for lakes in Slovenia show the values and classes that authority reports, with the season or year each was taken.

Lakes in Slovenia, 8 Swim Sites + 9 Lakes

Excellent: 8

Lake map

Map shows 17 lakes with coordinates

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Best-rated lakes to swim in Slovenia

Officially classified Excellent for the 2025 bathing season, ranked by how often that class has held.

Grajsko KopališčeExcellent · Excellent 11/11 seasons
Kopališče šobčev BajerExcellent · Excellent 11/11 seasons
Kopalno Območje Fužinski ZalivExcellent · Excellent 11/11 seasons
Kopalno Območje Mala ZakaExcellent · Excellent 11/11 seasons
Kopalno Območje UkancExcellent · Excellent 11/11 seasons
Kopalno Območje Velika ZakaExcellent · Excellent 11/11 seasons
Naravno Kopališče Grand Hotel TopliceExcellent · Excellent 11/11 seasons
Naravno Kopališče Hotel Vila BledExcellent · Excellent 11/11 seasons

Every rated bathing water in Slovenia

Grajsko KopališčeExcellent · Excellent 11/11 seasons
Kopališče šobčev BajerExcellent · Excellent 11/11 seasons
Kopalno Območje Fužinski ZalivExcellent · Excellent 11/11 seasons
Kopalno Območje Mala ZakaExcellent · Excellent 11/11 seasons
Kopalno Območje UkancExcellent · Excellent 11/11 seasons
Kopalno Območje Velika ZakaExcellent · Excellent 11/11 seasons
Naravno Kopališče Grand Hotel TopliceExcellent · Excellent 11/11 seasons
Naravno Kopališče Hotel Vila BledExcellent · Excellent 11/11 seasons

Places in Slovenia

Julian Alps lakesPlace · 1 lakes
Savinja reservoirsPlace · 3 lakes
Pomurje lakesPlace · 2 lakes

Named lakes

Lake	Place	Total phosphorus	Chlorophyll-a	Secchi	Year
Blejsko Jezero	—	12 µg/L	—	5.5 m	2023
Bohinjsko Jezero	—	5.0 µg/L	—	11 m	2023
Gajsevsko Jezero	—	163 µg/L	—	0.3 m	2022
Ledavsko Jezero	—	166 µg/L	—	0.3 m	2022
Pernisko Jezero	—	194 µg/L	—	0.3 m	2023
Slivnisko Jezero	—	43 µg/L	—	1.1 m	2023
Smartinsko Jezero	—	50 µg/L	—	0.8 m	2023
Velenjsko Jezero	—	53 µg/L	—	8.3 m	2022
Vogrscek Lake	—	12 µg/L	—	4.4 m	2023

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Frequently asked questions

Which lakes in Slovenia are best to swim in?: 8 of 8 designated bathing waters in Slovenia are rated Excellent for 2025 under the EU Bathing Water Directive. That class measures E. coli and intestinal enterococci only — it is not a safety clearance.
Is it safe to swim in Slovenia lakes?: The official class is a bacteriological rating, not a safety clearance. It does not cover algal blooms, nutrients, water clarity, currents, or depth. Conditions change after heavy rain. Check local signage and the operator's current notices before entering the water.
How is lake water quality measured in Slovenia?: 9 named lakes in Slovenia have official phosphorus and Secchi from the Slovenian Environment Agency (ARSO), via UNEP GEMS/Water, 2022–2023. These are the authority's own measurements, shown as reported.
Whose ratings do the Slovenia lake pages show?: The publishing authority's own. Pages for lakes in Slovenia show the values and classes that authority reports, with the season or year each was taken.