Castlehume Lough
Northern Ireland, Northern IrelandView mapDirections
NIEA publishes the water-quality measurements for Castlehume Lough. Here is what has been measured.
- Limited data
Castlehume Lough in Northern Ireland, Northern Ireland has official water-quality measurements, shown as reported. Phosphorus: 30 µg/L.
How Castlehume Lough is classified
Castlehume Lough in Northern Ireland is published with the authority's own measurements and class. The measurements here are published by the agency that samples the lake, as reported. Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
LakeQuality publishes no grade of its own beside it. Everything below thathas been measured is reported on this page.
Monitoring: the Northern Ireland Environment Agency (DAERA).
Castlehume Lough is a lake in Northern Ireland County, Northern Ireland.
Source: the Northern Ireland Environment Agency (DAERA) — not the EPA Water Quality Portal, last sampled 2024-11-27. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Castlehume Lough is safe to swim in today is a call for the Northern Ireland Environment Agency (DAERA) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Castlehume Lough
These are the measurements NIEA publishes for Castlehume Lough. More on the source.
No clarity data. Phosphorus 30 µg/L. TSI 53.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 30µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 53 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Frequently asked questions about Castlehume Lough
Where is Castlehume Lough?
- Castlehume Lough is a lake in Northern Ireland, Northern Ireland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Castlehume Lough?
- Castlehume Lough in Northern Ireland, Northern Ireland has official water-quality measurements, shown as reported. Phosphorus: 30 µg/L.
Is Castlehume Lough safe to swim in?
- Castlehume Lough has official nutrient and clarity measurements, not a bacteria swim class and not a safety clearance. Algal blooms, currents, and depth are not covered. Always check local notices before swimming.
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Where this data comes from
100 measurements from 1 monitoring station, 2016–2024. Retrieved from the Northern Ireland Environment Agency (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Department of Agriculture, Environment and Rural Affairs (Northern Ireland)
daera-ni100 samples · 2016–2024
Analytical methods
- DAERA NIEA lake nutrient monitoring
Monitoring station identifiers (1)
11257
Authority classifications are shown as the authority published them. See where the data comes from and data sources.