Bowyers Water :Waltham Cross
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 Bowyers Water :Waltham Cross. Here is what has been measured.
- Limited data
Bowyers Water :Waltham Cross in Herts and North London, England has official water-quality measurements, shown as reported. Phosphorus: 38.1 µg/L. Chlorophyll-a (algae): 5.7 µg/L.
How Bowyers Water :Waltham Cross is classified
Bowyers Water :Waltham Cross 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).
Bowyers Water :Waltham Cross 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 Bowyers Water :Waltham Cross 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 Bowyers Water :Waltham Cross
These are the measurements EA publishes for Bowyers Water :Waltham Cross. More on the source.
No clarity data. Phosphorus 38.1 µg/L. Chlorophyll-a 5.7 µg/L. TSI 52.
| 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 | 38.1µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 5.7µg/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. | 52 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Frequently asked questions about Bowyers Water :Waltham Cross
Where is Bowyers Water :Waltham Cross?
- Bowyers Water :Waltham Cross 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 Bowyers Water :Waltham Cross?
- Bowyers Water :Waltham Cross in Herts and North London, England has official water-quality measurements, shown as reported. Phosphorus: 38.1 µg/L. Chlorophyll-a (algae): 5.7 µg/L.
Is Bowyers Water :Waltham Cross safe to swim in?
- Bowyers Water :Waltham Cross 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
110 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-wqa110 samples · 2016–2022
Monitoring station identifiers (1)
TH-PGWL0176
Authority classifications are shown as the authority published them. See where the data comes from and data sources.