Lough Carra
Lough Carra in Mayo, Ireland has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 12 µg/L. Chlorophyll-a (algae): 2.2 µg/L.
Why Lough Carra has no A–F grade
Lough Carra in 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 and algae (chlorophyll-a), but not water clarity.
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 Environmental Protection Agency of Ireland, via UNEP GEMS/Water, with WFD lake names from EPA Ireland.
Lough Carra is a lake in Mayo County, Ireland.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-12-13. 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 Carra
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 12 µg/L. Chlorophyll-a: 2.2 µg/L. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 12 µg/L | Not graded |
| Chlorophyll-a (Algae) | 2.2 µg/L | Not graded |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lough Carra
Compare lakeside cabins, hotels, and vacation rentals near Lough Carra in Mayo, 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 Carra
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Fishing Lough Carra
Frequently asked questions about Lough Carra
What is the water quality of Lough Carra?
- Lough Carra in Mayo, Ireland has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 12 µg/L. Chlorophyll-a (algae): 2.2 µg/L.
Is Lough Carra safe to swim in?
- Lough Carra 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 Carra across LakeGrade
More lakes in Ireland
Where this data comes from
376 measurements from 7 monitoring stations, 2016–2023. Retrieved from UNEP GEMS/Water GFQA (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- European Environment Agency
europeanenvironmentagenc376 samples · —
Analytical methods
- GEMStat OPEN / CC BY 4.0
- EPA Ireland WFD lake waterbodies CC BY 4.0
Monitoring station identifiers (7)
IRL00106IRL00107IRL00108IRL00109IRL00110IRL00411IRL00412
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: 2023-12-13
Monitoring stations: 7