Which lakes in Norway are the clearest?

40 named lakes in Norway have an official Secchi depth. This page ranks the 20 deepest readings. Secchi is a clarity measurement, not a swim-safety class and not a LakeQuality A–F grade.

Is clear water the same as clean water?

No. Secchi measures how far a disk stays visible. A clear lake can still have bacteria, toxins, or contaminants this catalog does not grade. Open a lake page for the authority's values.

Clearest lakes in Norway

Clearest lakes in Norway: 40 named lakes have an official Secchi depth. The 20 below are ranked by that reading — water clarity, not a LakeQuality A–F grade.

Lake map

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Highest Secchi readings in Norway

Lake	Place	Total phosphorus	Chlorophyll-a	Secchi	Year
Steinvatnet	—	2.0 µg/L	0.70 µg/L	15 m	2020
Kapervatnet	—	2.0 µg/L	0.50 µg/L	13 m	2023
Svartdalsvatnet	—	2.0 µg/L	0.90 µg/L	10 m	2023
Lille Rostavatn	—	2.0 µg/L	0.60 µg/L	10 m	2020
Taarnvatnet	—	2.0 µg/L	0.70 µg/L	10 m	2022
Mjogsjoeen Lake	—	5.0 µg/L	0.80 µg/L	9.9 m	2021
Femunden Graaneset Lake	—	3.0 µg/L	0.80 µg/L	9.8 m	2023
Leirbekkvatnet	—	2.0 µg/L	0.70 µg/L	9.5 m	2020
Moskanjavri Lake	—	4.0 µg/L	0.90 µg/L	9.3 m	2020
Movatnet Eid	—	2.5 µg/L	0.80 µg/L	9.2 m	2019
Mjøsa Lake	—	4.6 µg/L	2.1 µg/L	9.0 m	2023
Mjosa Lake	—	5.0 µg/L	2.0 µg/L	8.5 m	2023
Fjellgardsvatnet	—	3.0 µg/L	1.2 µg/L	7.8 m	2023
Skardvatnet	—	2.3 µg/L	0.90 µg/L	7.3 m	2023
Atnsjoeen Lake	—	4.0 µg/L	1.5 µg/L	7.2 m	2022
Mjoesa Broettum Lake	—	5.8 µg/L	1.2 µg/L	6.8 m	2023
Surtningen Lake	—	8.0 µg/L	1.7 µg/L	6.7 m	2021
Sandnes-Langen Lake	—	3.5 µg/L	1.1 µg/L	6.7 m	2019
Geitvatnet	—	3.0 µg/L	0.80 µg/L	6.0 m	2020
Selbusjoen	—	3.0 µg/L	1.2 µg/L	5.5 m	2023

Showing 20 of 40 named lakes. Open a county or place page for the rest.

Frequently asked questions

Which lakes in Norway are the clearest?: 40 named lakes in Norway have an official Secchi depth. This page ranks the 20 deepest readings. Secchi is a clarity measurement, not a swim-safety class and not a LakeQuality A–F grade.
Is clear water the same as clean water?: No. Secchi measures how far a disk stays visible. A clear lake can still have bacteria, toxins, or contaminants this catalog does not grade. Open a lake page for the authority's values.