Turnershill Marsh :Fishers Green Lake
Herts and North London, EnglandView mapDirections
This is the name EA records for this water. It can describe one sampling location rather than the water as a whole.
EA publishes the water-quality measurements for Turnershill Marsh :Fishers Green Lake. Here is what has been measured.
- Limited data
Turnershill Marsh :Fishers Green Lake in Herts and North London, England has official water-quality measurements, shown as reported. Phosphorus: 569 µg/L. Chlorophyll-a (algae): 37 µg/L.
How Turnershill Marsh :Fishers Green Lake is classified
Turnershill Marsh :Fishers Green Lake in England is published with the authority's own measurements and class. The measurements here are published by the agency that samples the lake, as reported. Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.
LakeQuality publishes no grade of its own beside it. Everything below thathas been measured is 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: the Environment Agency (England) — not the EPA Water Quality Portal, last sampled 2022-01-28. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Turnershill Marsh :Fishers Green Lake is safe to swim in today is a call for the Environment Agency (England) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Turnershill Marsh :Fishers Green Lake
These are the measurements EA publishes for Turnershill Marsh :Fishers Green Lake. More on the source.
No clarity data. Phosphorus 569 µg/L. Chlorophyll-a 37 µg/L. TSI 81.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 569µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 37µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 81 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
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Frequently asked questions about Turnershill Marsh :Fishers Green Lake
Where is Turnershill Marsh :Fishers Green Lake?
- Turnershill Marsh :Fishers Green Lake is in Herts and North London, England. This is the name EA records for this water. It can describe one sampling location rather than the water as a whole. This page reports official water-quality measurements, shown as reported.
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, shown as reported. 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.
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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 shown as the authority published them. See where the data comes from and data sources.