St Anns Lake
St Anns Lake in West Thames, England has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 41 µg/L. Chlorophyll-a (algae): 6.7 µg/L.
Why St Anns Lake has no A–F grade
St Anns 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).
St Anns Lake is a lake in West Thames County, England.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-02-15. Grade methodology: LakeGrade methodology.
Watch St Anns Lake 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 St Anns Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 41 µg/L. Chlorophyll-a: 6.7 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 41 µg/L | Not graded |
| Chlorophyll-a (Algae) | 6.7 µg/L | Not graded |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near St Anns Lake
Compare lakeside cabins, hotels, and vacation rentals near St Anns Lake in West Thames, 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 St Anns Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Fishing St Anns Lake
Frequently asked questions about St Anns Lake
What is the water quality of St Anns Lake?
- St Anns Lake in West Thames, England has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 41 µg/L. Chlorophyll-a (algae): 6.7 µg/L.
Is St Anns Lake safe to swim in?
- St Anns 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.
Explore St Anns Lake across LakeGrade
More lakes in England
Where this data comes from
32 measurements from 1 monitoring station, 2019–2024. 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 · 2019–2024
Monitoring station identifiers (1)
TH-PRTS0039
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: 2024-02-15
Monitoring stations: 1