Lough Neagh
Lough Neagh in Northern Ireland, Northern Ireland has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 140 µg/L.
Why Lough Neagh has no A–F grade
Lough Neagh in Northern Ireland is published with the authority's own measurements, not a LakeQuality letter. official authority class; not a LakeQuality A–F letter Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
A letter on the LakeQuality scale would be an invention, not an official class. Everything below that has been measured is still reported on this page.
Monitoring: the Northern Ireland Environment Agency (DAERA).
Lough Neagh is a lake in Northern Ireland County, Northern Ireland.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-12-01. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lough Neagh
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 140 µg/L. Trophic State Index: 75.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 140 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 75 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Lough Neagh
Compare lakeside cabins, hotels, and vacation rentals near Lough Neagh in Northern Ireland, Northern Ireland — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Lough Neagh
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Fishing Lough Neagh
Frequently asked questions about Lough Neagh
What is the water quality of Lough Neagh?
- Lough Neagh in Northern Ireland, Northern Ireland has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 140 µg/L.
Is Lough Neagh safe to swim in?
- Lough Neagh 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.
Explore Lough Neagh across LakeGrade
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Where this data comes from
102 measurements from 4 monitoring stations, 2016–2022. 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-ni102 samples · 2016–2022
Analytical methods
- DAERA NIEA lake nutrient monitoring
Monitoring station identifiers (4)
10395103991040211024
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See methodology and data sources.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2022-12-01
Monitoring stations: 4