Stithians Reservoir
Stithians Reservoir in Devon and Cornwall, England has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 13 µg/L. Chlorophyll-a (algae): 6.9 µg/L.
Why Stithians Reservoir has no A–F grade
Stithians Reservoir 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).
Stithians Reservoir is a lake in Devon and Cornwall County, England.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2026-06-08. Grade methodology: LakeGrade methodology.
Watch Stithians Reservoir water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Stithians Reservoir
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: 6.9 µg/L. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 13 µg/L | Not graded |
| Chlorophyll-a (Algae) | 6.9 µg/L | Not graded |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Stithians Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Stithians Reservoir in Devon and Cornwall, 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.
Top-rated places to stay near Stithians Reservoir
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Fishing Stithians Reservoir
Frequently asked questions about Stithians Reservoir
What is the water quality of Stithians Reservoir?
- Stithians Reservoir in Devon and Cornwall, England has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 13 µg/L. Chlorophyll-a (algae): 6.9 µg/L.
Is Stithians Reservoir safe to swim in?
- Stithians 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.
Explore Stithians Reservoir across LakeGrade
More lakes in England
Where this data comes from
32 measurements from 1 monitoring station, 2024–2026. Retrieved from the Environment Agency (England; not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Environment Agency (England)
ea-wqa32 samples · 2024–2026
Monitoring station identifiers (1)
SW-LSN0003
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: 2026-06-08
Monitoring stations: 1