Bassenthwaite Lake
Bassenthwaite Lake in Cumbria and Lancashire, England has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 13 µg/L. Chlorophyll-a (algae): 4.1 µg/L.
Why Bassenthwaite Lake has no A–F grade
Bassenthwaite Lake in England 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 Environment Agency (England).
Bassenthwaite Lake is a lake in Cumbria and Lancashire County, England.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2026-05-14. 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 Bassenthwaite Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 13 µg/L. Chlorophyll-a: 4.1 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 13 µg/L | Not graded |
| Chlorophyll-a (Algae) | 4.1 µg/L | Not graded |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Bassenthwaite Lake
Compare lakeside cabins, hotels, and vacation rentals near Bassenthwaite Lake in Cumbria and Lancashire, England — 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 Bassenthwaite Lake
Frequently asked questions about Bassenthwaite Lake
What is the water quality of Bassenthwaite Lake?
- Bassenthwaite Lake in Cumbria and Lancashire, England has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 13 µg/L. Chlorophyll-a (algae): 4.1 µg/L.
Is Bassenthwaite Lake safe to swim in?
- Bassenthwaite Lake 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
174 measurements from 1 monitoring station, 2016–2026. Retrieved from the Environment Agency (England; not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Environment Agency (England)
ea-wqa174 samples · 2016–2026
Monitoring station identifiers (1)
NW-88010015
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: 2026-05-14
Monitoring stations: 1