Lake water quality in Japan
Japan has 188 named lakes in this catalog, sampled 2021–2025. 188 have total phosphorus, 159 have Secchi depth. Values are the authority's measurements, not a LakeQuality letter grade.
Lake map
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Places in Japan
- FukushimaCounty · 15 lakes
- NaganoCounty · 14 lakes
- AkitaCounty · 13 lakes
- GunmaCounty · 12 lakes
- MiyagiCounty · 11 lakes
- YamaguchiCounty · 11 lakes
- HokkaidoCounty · 10 lakes
- IwateCounty · 10 lakes
- HiroshimaCounty · 9 lakes
- NaraCounty · 7 lakes
- TochigiCounty · 6 lakes
- AomoriCounty · 5 lakes
- EhimeCounty · 5 lakes
- FukuokaCounty · 5 lakes
- KanagawaCounty · 5 lakes
- ChibaCounty · 4 lakes
- YamanashiCounty · 4 lakes
- GifuCounty · 3 lakes
- IshikawaCounty · 3 lakes
- KagoshimaCounty · 3 lakes
- KochiCounty · 3 lakes
- KumamotoCounty · 3 lakes
- SaitamaCounty · 3 lakes
- ToyamaCounty · 3 lakes
Named lakes
| Lake | Place | Total phosphorus | Chlorophyll-a | Secchi | Year |
|---|---|---|---|---|---|
| ます渕ダム | Fukuoka | 7.0 µg/L | — | 3.5 m | 2025 |
| みどり湖 | Nagano | 26 µg/L | — | — | 2024 |
| 七ケ宿ダム | Miyagi | 8.0 µg/L | — | 3.2 m | 2025 |
| 七北田ダム | Miyagi | 19 µg/L | — | — | 2024 |
| 三川ダム貯水池 | Hiroshima | 35 µg/L | — | 2.3 m | 2025 |
| 三方五湖 | Fukui | 45 µg/L | — | 1.3 m | 2025 |
| 下久保ダム貯水池 | Gunma | 14 µg/L | — | 3.0 m | 2025 |
| 下久保ダム貯水池 | Saitama | 14 µg/L | — | 3.0 m | 2025 |
| 世増ダム貯水池 | Aomori | 33 µg/L | — | 2.4 m | 2025 |
| 世増ダム貯水池 | Iwate | 59 µg/L | — | 1.8 m | 2024 |
| 中禅寺湖 | Tochigi | 5.0 µg/L | — | 7.8 m | 2024 |
| 中綱湖 | Nagano | 9.0 µg/L | — | — | 2024 |
| 丹沢湖 | Kanagawa | 8.0 µg/L | — | 4.0 m | 2025 |
| 亀山ダム貯水池 | Chiba | 38 µg/L | — | 1.3 m | 2025 |
| 二ノ目潟 | Akita | 11 µg/L | — | 5.0 m | 2024 |
| 二瀬ダム貯水池 | Saitama | 11 µg/L | — | 0.8 m | 2025 |
| 伊豆沼 | Miyagi | 98 µg/L | — | — | 2024 |
| 佐久間ダム貯水池 | Shizuoka | 34 µg/L | — | 1.6 m | 2025 |
| 佐幌ダム貯水池 | Hokkaido | 10 µg/L | — | 3.7 m | 2024 |
| 佐鳴湖 | Shizuoka | 140 µg/L | — | 0.4 m | 2025 |
| 倶多楽湖 | Hokkaido | 3.0 µg/L | — | 17 m | 2024 |
| 児島湖 | Okayama | 185 µg/L | — | 0.6 m | 2025 |
| 入畑ダム貯水池 | Iwate | 9.0 µg/L | — | 2.4 m | 2025 |
| 八田原ダム貯水池 | Hiroshima | 25 µg/L | — | 2.3 m | 2025 |
| 八郎湖 | Akita | 84 µg/L | — | 0.6 m | 2025 |
| 力丸ダム | Fukuoka | 17 µg/L | — | 3.0 m | 2025 |
| 北山ダム | Saga | 28 µg/L | — | 2.0 m | 2025 |
| 北川ダム | Oita | 11 µg/L | — | 3.5 m | 2025 |
| 北潟湖 | Ishikawa | 57 µg/L | — | 0.6 m | 2025 |
| 北潟湖 | Fukui | 78 µg/L | — | 0.8 m | 2025 |
| 十和田湖 | Aomori | 4.0 µg/L | — | 10 m | 2024 |
| 十和田湖 | Akita | 4.0 µg/L | — | 11 m | 2024 |
| 千五沢ダム貯水池 | Fukushima | 50 µg/L | — | 1.2 m | 2024 |
| 千苅水源池 | Hyogo | 26 µg/L | — | 2.3 m | 2025 |
| 南川ダム | Miyagi | 15 µg/L | — | — | 2024 |
| 印旛沼 | Chiba | 130 µg/L | — | 0.4 m | 2025 |
| 味噌川ダム貯水池 | Nagano | 7.0 µg/L | — | 8.6 m | 2025 |
| 四十四田ダム貯水池 | Iwate | 26 µg/L | — | 2.1 m | 2025 |
| 土師ダム貯水池 | Hiroshima | 19 µg/L | — | 0.6 m | 2025 |
| 坂本ダム湖 | Nara | 9.0 µg/L | — | — | 2024 |
| 境川ダム貯水池 | Toyama | 3.0 µg/L | — | 5.1 m | 2024 |
| 境川ダム貯水池 | Gifu | 3.0 µg/L | — | 5.1 m | 2024 |
| 夏瀬ダム | Akita | 6.0 µg/L | — | 5.0 m | 2024 |
| 大倉ダム | Miyagi | 8.0 µg/L | — | — | 2024 |
| 大原湖 | Yamaguchi | 8.0 µg/L | — | 4.4 m | 2025 |
| 大川ダム貯水池 | Fukushima | 11 µg/L | — | 2.8 m | 2025 |
| 大座法師池 | Nagano | 16 µg/L | — | — | 2024 |
| 大橋ダム貯水池 | Kochi | 4.0 µg/L | — | — | 2024 |
| 大迫ダム湖 | Nara | 10 µg/L | — | — | 2024 |
| 奈良俣ダム貯水池 | Gunma | 4.0 µg/L | — | 5.5 m | 2024 |
| 奥只見貯水池 | Fukushima | 6.0 µg/L | — | 5.6 m | 2024 |
| 奥只見貯水池 | Niigata | 5.0 µg/L | — | 6.0 m | 2024 |
| 女神湖 | Nagano | 14 µg/L | — | — | 2024 |
| 宍道湖 | Shimane | 45 µg/L | — | 1.5 m | 2025 |
| 室生ダム湖 | Nara | 32 µg/L | — | 2.7 m | 2024 |
| 宮ヶ瀬湖 | Kanagawa | 6.0 µg/L | — | 5.2 m | 2025 |
| 寒河江ダム貯水池 | Yamagata | 10 µg/L | — | 1.5 m | 2024 |
| 寺内ダム | Fukuoka | 31 µg/L | — | 1.6 m | 2025 |
| 小川原湖 | Aomori | 33 µg/L | — | 1.4 m | 2025 |
| 小河内貯水池 | Tokyo | 8.0 µg/L | — | 6.5 m | 2025 |
| 小瀬川ダム貯水池 | Hiroshima | 11 µg/L | — | 2.6 m | 2025 |
| 小野川湖 | Fukushima | 7.0 µg/L | — | 2.7 m | 2024 |
| 小野湖 | Yamaguchi | 22 µg/L | — | 2.5 m | 2025 |
| 尾瀬沼 | Gunma | 6.0 µg/L | — | 3.7 m | 2024 |
| 尾瀬沼 | Fukushima | 10 µg/L | — | 3.5 m | 2024 |
| 屈斜路湖 | Hokkaido | 6.0 µg/L | — | 8.3 m | 2024 |
| 山中湖 | Yamanashi | 10 µg/L | — | 4.4 m | 2025 |
| 山代湖 | Yamaguchi | 14 µg/L | — | 3.6 m | 2025 |
| 岩洞ダム貯水池 | Iwate | 9.0 µg/L | — | 3.4 m | 2024 |
| 岩見ダム | Akita | 14 µg/L | — | 2.4 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 |
| 市房ダム貯水池 | Kumamoto | 15 µg/L | — | 1.1 m | 2025 |
| 布目ダム湖 | Nara | 36 µg/L | — | 2.5 m | 2024 |
| 帝釈川ダム貯水池 | Hiroshima | 20 µg/L | — | 2.3 m | 2025 |
| 常盤湖 | Yamaguchi | 20 µg/L | — | 2.0 m | 2025 |
| 弥栄ダム貯水池 | Hiroshima | 8.0 µg/L | — | 5.8 m | 2025 |
| 弥栄湖 | Yamaguchi | 8.5 µg/L | — | 5.8 m | 2025 |
| 御所ダム貯水池 | Iwate | 10 µg/L | — | 2.5 m | 2025 |
| 徳山ダム貯水池 | Gifu | 4.5 µg/L | — | — | 2024 |
Showing 80 of 188 named lakes. Open a county or place page for the rest.
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