How many named lakes are in Tochigi?

6 named lakes in Tochigi, Japan, have official phosphorus and Secchi, 2024–2025. Values are the authority's measurements, shown as reported.

Where do the Tochigi readings come from?

Tochigi pages show official phosphorus, chlorophyll-a, and Secchi from the publishing authority, with the year each was taken.

Map shows 6 lakes with coordinates

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Lake	Place	Total phosphorus	Chlorophyll-a	Secchi	Year
中禅寺湖	Tochigi	5.0 µg/L	—	7.8 m	2024
川俣ダム貯水池	Tochigi	7.0 µg/L	—	6.1 m	2025
川治ダム貯水池	Tochigi	8.0 µg/L	—	4.5 m	2025
深山ダム貯水池	Tochigi	4.0 µg/L	—	7.3 m	2024
渡良瀬貯水池	Tochigi	100 µg/L	—	0.6 m	2025
湯の湖	Tochigi	14 µg/L	—	3.1 m	2024

How many named lakes are in Tochigi?: 6 named lakes in Tochigi, Japan, have official phosphorus and Secchi, 2024–2025. Values are the authority's measurements, shown as reported.
Where do the Tochigi readings come from?: Tochigi pages show official phosphorus, chlorophyll-a, and Secchi from the publishing authority, with the year each was taken.

All official water quality for lakes in Japan

EU bathing ratings and named-lake measurements

Rated bathing waters at campgrounds