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LakeQuality

Lakes in Finland

Find lakes in Finland: 211 designated lake bathing waters classified under the EU Bathing Water Directive. 202 are rated Excellent for 2025.

The same country also has official phosphorus, chlorophyll-a, and Secchi for 4,006 named lakes, sampled 2016–2026. Those are nutrient and clarity readings, a different measurement from the Directive's bacteria class.

Updated 2025

Excellent: 202Good: 4Sufficient: 1Not classified: 4

Lake map

Map shows 4,217 lakes with coordinates · list below has 328

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Best-rated lakes to swim in Finland

Officially classified Excellent for the 2025 bathing season, ranked by how often that class has held. Full best-lakes list →

  1. AavarantaExcellent · Excellent 11/11 seasons
  2. AhvenistonjarviExcellent · Excellent 11/11 seasons
  3. AittolampiExcellent · Excellent 11/11 seasons
  4. AlasjarviExcellent · Excellent 11/11 seasons
  5. ApiaExcellent · Excellent 11/11 seasons
  6. AroExcellent · Excellent 11/11 seasons
  7. Aulangonjarvi KihtersuoExcellent · Excellent 11/11 seasons
  8. Bergstromin LampiExcellent · Excellent 11/11 seasons
  9. ElianderExcellent · Excellent 11/11 seasons
  10. HaijanvirtaExcellent · Excellent 11/11 seasons
  11. HakliExcellent · Excellent 11/11 seasons
  12. HarjanvatsaExcellent · Excellent 11/11 seasons
  13. HasselholmenExcellent · Excellent 11/11 seasons
  14. HeikinpohjaExcellent · Excellent 11/11 seasons
  15. HervantajarviExcellent · Excellent 11/11 seasons

Every rated bathing water in Finland

Places in Finland

Named lakes

LakePlaceTotal phosphorusChlorophyll-aSecchiYear
AakenusjärviKittilä7.8 µg/L3.3 µg/L3.2 m2023
AalisjärviKolari33 µg/L25 µg/L0.9 m2025
AapajärviTornio22 µg/L6.2 µg/L0.8 m2025
AarlammiHyvinkää43 µg/L76 µg/L1.4 m2017
AatsinginjärviSalla9.1 µg/L2.3 µg/L2.5 m2023
AhjärviRuokolahti7.7 µg/L4.8 µg/L2.5 m2024
AhmasjärviEura29 µg/L13 µg/L1.0 m2023
AhmasjärviUtajärvi110 µg/L120 µg/L0.4 m2026
AhmasjärviOulu21 µg/L—0.5 m2025
AhmasvesiUusikaupunki16 µg/L3.1 µg/L1.8 m2024
Ahmo LakeSiilinjärvi34 µg/L8.9 µg/L2.5 m2025
AhmoolammiKarkkila16 µg/L6.3 µg/L1.6 m2017
AhostenjärviLempäälä28 µg/L24 µg/L0.8 m2025
ÄhtärinjärviÄhtäri21 µg/L9.7 µg/L1.2 m2026
AhtialanjärviLempäälä26 µg/L11 µg/L1.1 m2025
Ahuli LakeKangasala29 µg/L24 µg/L1.4 m2025
Ahvenaiset LakeHollola11 µg/L4.3 µg/L4.6 m2026
AhvenalampiLohja12 µg/L11 µg/L1.8 m2024
Ahveninen LakeSuonenjoki14 µg/L9.4 µg/L1.2 m2026
Ahveninen LakeLaukaa24 µg/L18 µg/L1.7 m2026
Ahveninen LakeRautavaara16 µg/L7.9 µg/L1.4 m2017
Ahveninen LakeTervo10 µg/L8.3 µg/L1.8 m2018
Ahveninen LakeLaukaa32 µg/L18 µg/L1.0 m2026
Ahvenisto LakeTampere41 µg/L27 µg/L1.3 m2026
Ahvenisto LakeHämeenlinna12 µg/L4.5 µg/L4.2 m2018
AhvenjärviMuhos18 µg/L7.2 µg/L1.2 m2018
AhvenjärviPudasjärvi29 µg/L18 µg/L1.1 m2019
AhvenjärviVesilahti9.0 µg/L2.9 µg/L3.0 m2019
AhvenjärviMäntyharju11 µg/L6.2 µg/L2.4 m2023
AhvenjärviHartola15 µg/L2.6 µg/L3.0 m2025
AhvenlammiKarkkila9.0 µg/L2.9 µg/L1.5 m2018
AhvenlammiTampere6.8 µg/L—3.3 m2026
AhvenlampiKuopio26 µg/L13 µg/L1.2 m2025
AhvenlampiPieksämäki14 µg/L6.3 µg/L3.8 m2026
AhvenlampiSuonenjoki12 µg/L3.5 µg/L2.3 m2022
AhvenlampiVihti15 µg/L21 µg/L2.3 m2023
AhvenlampiKitee8.2 µg/L5.5 µg/L2.5 m2025
AhvenuksenlampiKuopio16 µg/L16 µg/L1.4 m2025
Ahveroinen LakeUtajärvi14 µg/L4.6 µg/L3.5 m2016
AhveslampiHartola22 µg/L14 µg/L2.3 m2019
ÄijänpäivänjärviLieksa22 µg/L3.5 µg/L1.6 m2025
ÄimäjärviHämeenlinna39 µg/L31 µg/L1.0 m2024
Ainali LakeHaapavesi53 µg/L25 µg/L0.5 m2026
AinesjärviYlöjärvi20 µg/L6.6 µg/L1.0 m2025
AinijärviSavukoski45 µg/L13 µg/L2.0 m2025
Aisus LakeJuuka11 µg/L5.6 µg/L2.3 m2025
AitjärviMäntyharju16 µg/L9.3 µg/L1.3 m2024
AittojärviSuomussalmi8.2 µg/L4.1 µg/L2.2 m2019
AittojärviSuomussalmi12 µg/L7.3 µg/L2.0 m2025
AittojärviKiuruvesi35 µg/L24 µg/L0.9 m2025
AittojärviPudasjärvi143 µg/L9.0 µg/L0.2 m2022
AittojärviPudasjärvi50 µg/L37 µg/L0.7 m2022
Aittojärvi-MurtojärviKuhmo12 µg/L5.5 µg/L1.4 m2026
AittolampiKontiolahti5.2 µg/L1.3 µg/L9.9 m2024
AivusjärviIkaalinen25 µg/L29 µg/L0.4 m2024
AjankijärviPello3.2 µg/L2.4 µg/L6.0 m2025
AjosjärviMänttä-Vilppula14 µg/L9.2 µg/L2.1 m2023
ÄkäsjärviMuonio17 µg/L16 µg/L2.1 m2025
Äkäslompolo LakeKolari19 µg/L4.5 µg/L2.2 m2018
AkkijärviHämeenlinna30 µg/L31 µg/L1.3 m2024
AkonlampiKuusamo7.0 µg/L——2016
AkonlampiKuusamo8.0 µg/L3.6 µg/L—2017
Ala-AskanjärviKemijärvi8.4 µg/L6.4 µg/L2.6 m2020
Ala-Haajainen LakeVieremä28 µg/L20 µg/L1.5 m2026
Ala-Hippa LakeKuopio20 µg/L13 µg/L1.5 m2024
Ala-Hirvas LakeLuumäki15 µg/L17 µg/L1.4 m2026
Ala-JalkajärviOrivesi7.0 µg/L3.7 µg/L2.4 m2026
Ala-KastejärviKarstula34 µg/L19 µg/L0.6 m2026
Ala-Keitele LakeÄänekoski10 µg/L3.2 µg/L2.7 m2026
Ala-Kesiö LakeHeinola7.1 µg/L3.8 µg/L2.4 m2022
Ala-Kintaus LakePetäjävesi13 µg/L4.8 µg/L1.8 m2023
Ala-Kitka LakeKuusamo6.6 µg/L4.1 µg/L3.6 m2024
Ala-KivijärviLuumäki8.3 µg/L3.5 µg/L2.7 m2025
Ala-Korppinen LakeSavonlinna21 µg/L6.7 µg/L0.9 m2024
Ala-KorvalampiKuopio26 µg/L—0.8 m2026
Ala-Kuhanen LakeMikkeli12 µg/L2.7 µg/L2.5 m2018
Ala-Kuomio LakeMikkeli12 µg/L4.4 µg/L1.8 m2018
Ala-Kuurtonen LakeSuomussalmi13 µg/L5.3 µg/L1.8 m2025
Ala-Luosta LakeRautavaara27 µg/L9.6 µg/L1.0 m2024
Ala-LuotojärviSavonlinna12 µg/L4.8 µg/L2.2 m2026
BlomträsketKristiinankaupunki37 µg/L5.4 µg/L0.8 m2022
ElijärviPöytyä16 µg/L7.3 µg/L1.4 m2025
GallträskKauniainen17 µg/L6.3 µg/L1.0 m2024
HilappajärviKustavi28 µg/L33 µg/L1.0 m2022
ImmalanjärviImatra9.0 µg/L2.4 µg/L3.8 m2025
Jalanti LakeAkaa67 µg/L9.3 µg/L0.5 m2026
JämijärviJämijärvi60 µg/L15 µg/L0.7 m2026
KakskerranjärviTurku25 µg/L5.7 µg/L2.1 m2025
KanteleenjärviPukkila90 µg/L18 µg/L0.4 m2025
KauhajärviLapua47 µg/L12 µg/L0.8 m2026
KekalampiYlivieska19 µg/L10 µg/L1.2 m2016
Keskis TräskVöyri91 µg/L72 µg/L0.3 m2024
Kilpisjärvi—3.0 µg/L1.2 µg/L7.2 m2026
KoivistonlammiHumppila27 µg/L——2025
KonttijärviTervola13 µg/L5.9 µg/L1.4 m2025
KråkholmanjärviPietarsaari120 µg/L—0.7 m2024
Kuusijärvi Hanaböle TräskVantaa35 µg/L50 µg/L0.6 m2025
LappajärviLappajärvi21 µg/L9.9 µg/L1.7 m2026
LittoistenjärviLieto29 µg/L7.3 µg/L1.9 m2026
LuodonjärviLuoto44 µg/L11 µg/L0.8 m2026
Narssjön LakePedersören kunta64 µg/L42 µg/L0.5 m2026
NummijärviKauhajoki36 µg/L70 µg/L0.6 m2026
Peitsjön LakeMaalahti63 µg/L——2025
PitkäjärviTyrnävä130 µg/L12 µg/L—2016
PolusjärviPyhäjoki23 µg/L4.3 µg/L0.8 m2023
PyhäjärviPelkosenniemi15 µg/L10 µg/L2.5 m2021
RaumajärviMynämäki22 µg/L1.1 µg/L—2016
RäyringinjärviVeteli40 µg/L26 µg/L0.9 m2026
RehtijärviJokioinen85 µg/L13 µg/L0.4 m2026
SandöträsketHanko9.6 µg/L2.4 µg/L1.5 m2022
SavojärviNousiainen39 µg/L21 µg/L0.5 m2024
StorträskHelsinki11 µg/L23 µg/L0.9 m2026
Sysilaxviken LakeParainen77 µg/L45 µg/L0.6 m2025
TammijärviPyhtää18 µg/L8.6 µg/L1.3 m2026
Västerfjärden LakeNärpiö110 µg/L19 µg/L0.5 m2026
VihtijärviVehmaa27 µg/L9.6 µg/L1.7 m2025
Ylimmäinen SankajärviSimo27 µg/L15 µg/L0.6 m2023

Showing 117 of 4,006 named lakes. Open a county or place page for the rest.

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Frequently asked questions

Which lakes in Finland are best to swim in?
202 of 211 designated bathing waters in Finland 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 Finland 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 Finland?
4,006 named lakes in Finland have official phosphorus, chlorophyll-a, and Secchi from the Finnish Environment Institute (Syke) and the ELY Centres, 2016–2026. These are the authority's own measurements, shown as reported.
Whose ratings do the Finland lake pages show?
The publishing authority's own. Pages for lakes in Finland show the values and classes that authority reports, with the season or year each was taken.

Lakes in other countries

Lakes in Europe

Directory of official lake water quality

Lake campgrounds in Europe

Rated bathing waters at campgrounds

Best lakes in Finland

Excellent-rated bathing waters

Clearest lakes in Finland

Named lakes ranked by Secchi

Lakes in Sweden

Water quality for lakes in Sweden

Lakes in Switzerland

Water quality for lakes in Switzerland

Lakes in Denmark

Water quality for lakes in Denmark

Lakes in Spain

Water quality for lakes in Spain

Lakes in Lithuania

Water quality for lakes in Lithuania

Lakes in Belgium

Water quality for lakes in Belgium

Lakes in Czechia

Water quality for lakes in Czechia

Lakes in Portugal

Water quality for lakes in Portugal

Where to stay near Finland

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Source: European Environment Agency (EEA), Bathing Water Directive. CC-BY 4.0.

Finnish Environment Institute (SYKE) VESLA surface water quality. Published as the authority reports it.

Monitoring: the Finnish Environment Institute (Syke) and the ELY Centres.