Lake water quality in Northern Ireland
Northern Ireland has 20 named lakes in this catalog, sampled 2022–2024. 20 have total phosphorus, Values are the authority's measurements, not a LakeQuality letter grade.
Lake map
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Named lakes
| Lake | Place | Total phosphorus | Chlorophyll-a | Secchi | Year |
|---|---|---|---|---|---|
| Cam Lough | Northern Ireland | 50 µg/L | — | — | 2024 |
| Castlehume Lough | Northern Ireland | 30 µg/L | — | — | 2024 |
| Clea Lakes | Northern Ireland | 110 µg/L | — | — | 2024 |
| Lough Beg | Northern Ireland | 130 µg/L | — | — | 2024 |
| Lough Fea | Northern Ireland | 20 µg/L | — | — | 2024 |
| Lough Gullion | Northern Ireland | 200 µg/L | — | — | 2024 |
| Lough Island Reavy Reservoir | Northern Ireland | 20 µg/L | — | — | 2024 |
| Lough Melvin | Northern Ireland | 40 µg/L | — | — | 2024 |
| Lough Mourne | Northern Ireland | 60 µg/L | — | — | 2024 |
| Lough Neagh | Northern Ireland | 140 µg/L | — | — | 2022 |
| Lough Ross | Northern Ireland | 70 µg/L | — | — | 2024 |
| Lough Scolban | Northern Ireland | 30 µg/L | — | — | 2024 |
| Lower Lough Erne | Northern Ireland | 60 µg/L | — | — | 2024 |
| Lower Lough Macnean | Northern Ireland | 35 µg/L | — | — | 2024 |
| Portmore Lough | Northern Ireland | 260 µg/L | — | — | 2024 |
| Silent Valley Reservoir | Northern Ireland | 30 µg/L | — | — | 2024 |
| Spelga Dam | Northern Ireland | 20 µg/L | — | — | 2024 |
| Stonyford Reservoir | Northern Ireland | 80 µg/L | — | — | 2024 |
| Upper Lough Erne | Northern Ireland | 70 µg/L | — | — | 2024 |
| Upper Lough Macnean | Northern Ireland | 30 µg/L | — | — | 2024 |
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