Joensuu, Finland
County page for 80 named lakes in Finland. Official surface phosphorus, chlorophyll-a, and Secchi — not a swim-safety class and not a LakeQuality letter.
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Named lakes
| Lake | Place | Total phosphorus | Chlorophyll-a | Secchi | Year |
|---|---|---|---|---|---|
| Ala-Otmen Lake | Joensuu | 15 µg/L | 4.4 µg/L | 1.5 m | 2025 |
| Ala-Paukkaja Lake | Joensuu | 10 µg/L | 3.4 µg/L | — | 2017 |
| Alanen-Koverojärvi | Joensuu | 12 µg/L | 10 µg/L | 1.4 m | 2024 |
| Eeronlampi | Joensuu | 6.0 µg/L | 2.8 µg/L | 2.0 m | 2016 |
| Eimisjärvi | Joensuu | 18 µg/L | 7.0 µg/L | 1.1 m | 2021 |
| Enonjärvi | Joensuu | 6.4 µg/L | 2.7 µg/L | 3.9 m | 2025 |
| Haapajärvi | Joensuu | 8.0 µg/L | 4.6 µg/L | 2.8 m | 2022 |
| Haapojärvi | Joensuu | 17 µg/L | 16 µg/L | 2.0 m | 2018 |
| Haarajärvi | Joensuu | 14 µg/L | 5.9 µg/L | 1.3 m | 2026 |
| Hammasjärvi | Joensuu | 8.0 µg/L | 4.6 µg/L | 2.9 m | 2023 |
| Hepolampi | Joensuu | 27 µg/L | 52 µg/L | 1.1 m | 2025 |
| Herajärvi | Joensuu | 3.7 µg/L | 1.8 µg/L | 6.3 m | 2021 |
| Heranen Lake | Joensuu | 4.5 µg/L | 2.5 µg/L | 2.3 m | 2024 |
| Hiirenvesi | Joensuu | 11 µg/L | 6.3 µg/L | 1.9 m | 2025 |
| Iso Ja Pikku Elinlampi | Joensuu | 16 µg/L | 10 µg/L | 0.9 m | 2024 |
| Iso Lake | Joensuu | 6.5 µg/L | 2.0 µg/L | 2.3 m | 2022 |
| Iso-Tölppä Lake | Joensuu | 9.0 µg/L | 3.4 µg/L | 4.0 m | 2021 |
| Jäsys-Retujärvi | Joensuu | 14 µg/L | 9.8 µg/L | 1.3 m | 2025 |
| Jukajärvi | Joensuu | 16 µg/L | 6.6 µg/L | 1.5 m | 2022 |
| Kaatiojärvi | Joensuu | 17 µg/L | 7.5 µg/L | 1.2 m | 2025 |
| Kaatiolampi | Joensuu | 12 µg/L | 3.4 µg/L | 2.6 m | 2025 |
| Kaltimonjärvi | Joensuu | 5.0 µg/L | 4.4 µg/L | 3.5 m | 2025 |
| Kanajärvi | Joensuu | 9.8 µg/L | 7.9 µg/L | 2.6 m | 2021 |
| Kannellampi | Joensuu | 9.5 µg/L | 2.8 µg/L | 2.5 m | 2025 |
| Karsikkojärvi | Joensuu | 6.5 µg/L | 4.7 µg/L | 1.9 m | 2026 |
| Kastelampi | Joensuu | 14 µg/L | 13 µg/L | 1.3 m | 2025 |
| Keskijärvi | Joensuu | 10 µg/L | 4.9 µg/L | 2.7 m | 2025 |
| Kinnasjärvi | Joensuu | 16 µg/L | 8.4 µg/L | 1.1 m | 2021 |
| Kitsanjärvi | Joensuu | 11 µg/L | 12 µg/L | 2.2 m | 2022 |
| Kivijärvi | Joensuu | 20 µg/L | 8.4 µg/L | 1.0 m | 2026 |
| Kontiojärvi | Joensuu | 20 µg/L | 15 µg/L | 1.6 m | 2026 |
| Korpijärvi | Joensuu | 20 µg/L | 11 µg/L | 1.0 m | 2022 |
| Koveron Lastujärvi | Joensuu | 9.3 µg/L | 2.8 µg/L | 2.2 m | 2025 |
| Kuusjärvi | Joensuu | 5.1 µg/L | 3.4 µg/L | 2.5 m | 2022 |
| Kuusjärvi | Joensuu | 5.5 µg/L | 5.5 µg/L | 2.4 m | 2018 |
| Kuusjärvi | Joensuu | 5.0 µg/L | 1.9 µg/L | 3.3 m | 2026 |
| Kyhönjärvi | Joensuu | 6.0 µg/L | 3.4 µg/L | 3.1 m | 2022 |
| Kyyrönlampi | Joensuu | 5.4 µg/L | 3.3 µg/L | 3.6 m | 2024 |
| Lastujärvi | Joensuu | 4.7 µg/L | 4.2 µg/L | 3.8 m | 2023 |
| Latvalampi | Joensuu | 8.0 µg/L | 4.2 µg/L | 2.5 m | 2021 |
| Löytöjärvi | Joensuu | 5.2 µg/L | 2.5 µg/L | 2.9 m | 2017 |
| Maaselkä Lake | Joensuu | 9.6 µg/L | 6.8 µg/L | 1.8 m | 2024 |
| Marpanlampi | Joensuu | 10 µg/L | 4.0 µg/L | 1.5 m | 2022 |
| Melakko-Loitimo Lake | Joensuu | 16 µg/L | 7.3 µg/L | 1.4 m | 2025 |
| Murtojärvi | Joensuu | 3.9 µg/L | 1.2 µg/L | 6.5 m | 2023 |
| Mustalampi | Joensuu | 30 µg/L | 30 µg/L | 0.5 m | 2018 |
| Öllölänjärvi | Joensuu | 20 µg/L | 5.9 µg/L | 1.4 m | 2022 |
| Otmenjärvi | Joensuu | 15 µg/L | 11 µg/L | 1.4 m | 2025 |
| Paavonlampi | Joensuu | 3.5 µg/L | 1.7 µg/L | 5.7 m | 2025 |
| Palojärvi | Joensuu | 15 µg/L | 9.1 µg/L | 1.2 m | 2025 |
| Palojärvi | Joensuu | 10 µg/L | 5.3 µg/L | 1.5 m | 2025 |
| Petäjäjärvi | Joensuu | 15 µg/L | 17 µg/L | 1.2 m | 2023 |
| Pirttijärvet Lake | Joensuu | 12 µg/L | 6.8 µg/L | 1.6 m | 2016 |
| Pirttijärvi | Joensuu | 18 µg/L | 16 µg/L | 1.1 m | 2021 |
| Pirttilampi | Joensuu | 14 µg/L | 5.6 µg/L | 1.5 m | 2026 |
| Pitkäjärvi | Joensuu | 11 µg/L | 6.1 µg/L | 1.9 m | 2026 |
| Pyhäselkä Lake | Joensuu | 11 µg/L | 4.7 µg/L | 1.9 m | 2026 |
| Rauanjärvi | Joensuu | 7.2 µg/L | 4.0 µg/L | 2.6 m | 2025 |
| Revon Sonkaja Lake | Joensuu | 21 µg/L | 23 µg/L | — | 2017 |
| Ristilampi | Joensuu | 9.3 µg/L | 15 µg/L | 2.1 m | 2021 |
| Riuttanen Lake | Joensuu | 12 µg/L | 6.3 µg/L | 1.1 m | 2021 |
| Saarijärvi | Joensuu | 12 µg/L | 7.2 µg/L | 1.7 m | 2021 |
| Saarilampi | Joensuu | 10 µg/L | 4.6 µg/L | 2.2 m | 2025 |
| Sonkajanrannanjärvi | Joensuu | 20 µg/L | 16 µg/L | 0.8 m | 2024 |
| Suontakasen Pitkä Lake | Joensuu | 11 µg/L | 2.2 µg/L | 2.6 m | 2023 |
| Suuri Hietajärvi | Joensuu | 4.1 µg/L | 2.0 µg/L | 3.7 m | 2025 |
| Suuri Kalliojärvi | Joensuu | 19 µg/L | 10 µg/L | 1.0 m | 2025 |
| Suuri Lapinjärvi | Joensuu | 4.4 µg/L | 2.8 µg/L | 4.4 m | 2022 |
| Tanikka Lake | Joensuu | 16 µg/L | 4.7 µg/L | 1.3 m | 2023 |
| Tuomijärvi | Joensuu | 11 µg/L | 8.9 µg/L | 2.0 m | 2021 |
| Uramo Lake | Joensuu | 7.7 µg/L | 4.4 µg/L | 2.1 m | 2024 |
| Uskaljärvi | Joensuu | 3.4 µg/L | 2.0 µg/L | 4.8 m | 2024 |
| Valkealampi | Joensuu | 3.9 µg/L | 1.0 µg/L | 7.8 m | 2025 |
| Valkeinen Lake | Joensuu | 12 µg/L | 5.6 µg/L | 1.5 m | 2025 |
| Varaslampi | Joensuu | 52 µg/L | 35 µg/L | 0.8 m | 2024 |
| Varpolampi | Joensuu | 16 µg/L | 7.4 µg/L | 0.8 m | 2025 |
| Venäjänjärvi | Joensuu | 5.0 µg/L | 1.3 µg/L | 4.7 m | 2026 |
| Ylä-Paukkaja Lake | Joensuu | 3.4 µg/L | 2.2 µg/L | 6.0 m | 2021 |
| Ylimmäinen Lake | Joensuu | 5.0 µg/L | 2.6 µg/L | 2.6 m | 2025 |
| Ylinen Lake | Joensuu | 3.3 µg/L | 2.7 µg/L | 3.9 m | 2022 |
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