Stonyford Reservoir
Stonyford Reservoir in Northern Ireland, Northern Ireland has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 80 µg/L.
Why Stonyford Reservoir has no A–F grade
Stonyford Reservoir 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).
Stonyford Reservoir is a lake in Northern Ireland County, Northern Ireland.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-11-28. 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 Stonyford Reservoir
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 80 µg/L. Trophic State Index: 67.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 80 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 67 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Stonyford Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Stonyford Reservoir 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.
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Fishing Stonyford Reservoir
Frequently asked questions about Stonyford Reservoir
What is the water quality of Stonyford Reservoir?
- Stonyford Reservoir in Northern Ireland, Northern Ireland has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 80 µg/L.
Is Stonyford Reservoir safe to swim in?
- Stonyford Reservoir 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
105 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-ni105 samples · 2016–2024
Analytical methods
- DAERA NIEA lake nutrient monitoring
Monitoring station identifiers (1)
10933
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: 2024-11-28
Monitoring stations: 1