Turnershill Marsh :Fishers Green Lake
Turnershill Marsh :Fishers Green Lake in Herts and North London, England has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 569 µg/L. Chlorophyll-a (algae): 37 µg/L.
Why Turnershill Marsh :Fishers Green Lake has no A–F grade
Turnershill Marsh :Fishers Green 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).
Turnershill Marsh :Fishers Green Lake is a lake in Herts and North London County, England.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-01-28. Grade methodology: LakeGrade methodology.
Watch Turnershill Marsh :Fishers Green 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 Turnershill Marsh :Fishers Green Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 569 µg/L. Chlorophyll-a: 37 µg/L. Trophic State Index: 81.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 569 µg/L | Not graded |
| Chlorophyll-a (Algae) | 37 µg/L | Not graded |
| Trophic State Index (TSI) | 81 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Turnershill Marsh :Fishers Green Lake
Compare lakeside cabins, hotels, and vacation rentals near Turnershill Marsh :Fishers Green Lake in Herts and North London, 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 Turnershill Marsh :Fishers Green 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 Turnershill Marsh :Fishers Green Lake
Frequently asked questions about Turnershill Marsh :Fishers Green Lake
What is the water quality of Turnershill Marsh :Fishers Green Lake?
- Turnershill Marsh :Fishers Green Lake in Herts and North London, England has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 569 µg/L. Chlorophyll-a (algae): 37 µg/L.
Is Turnershill Marsh :Fishers Green Lake safe to swim in?
- Turnershill Marsh :Fishers Green 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 Turnershill Marsh :Fishers Green Lake across LakeGrade
More lakes in England
Where this data comes from
109 measurements from 1 monitoring station, 2016–2022. Retrieved from the Environment Agency (England; not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Environment Agency (England)
ea-wqa109 samples · 2016–2022
Monitoring station identifiers (1)
TH-PGWL0175
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: 2022-01-28
Monitoring stations: 1