Seventy Acres Lake :Fishers Green
Seventy Acres Lake :Fishers Green in Herts and North London, England has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 200 µg/L. Chlorophyll-a (algae): 8.1 µg/L.
Why Seventy Acres Lake :Fishers Green has no A–F grade
Seventy Acres Lake :Fishers Green 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).
Seventy Acres Lake :Fishers Green 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.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Seventy Acres Lake :Fishers Green
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 200 µg/L. Chlorophyll-a: 8.1 µg/L. Trophic State Index: 66.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 200 µg/L | Not graded |
| Chlorophyll-a (Algae) | 8.1 µg/L | Not graded |
| Trophic State Index (TSI) | 66 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Seventy Acres Lake :Fishers Green
Compare lakeside cabins, hotels, and vacation rentals near Seventy Acres Lake :Fishers Green 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.
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Fishing Seventy Acres Lake :Fishers Green
Frequently asked questions about Seventy Acres Lake :Fishers Green
What is the water quality of Seventy Acres Lake :Fishers Green?
- Seventy Acres Lake :Fishers Green in Herts and North London, England has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 200 µg/L. Chlorophyll-a (algae): 8.1 µg/L.
Is Seventy Acres Lake :Fishers Green safe to swim in?
- Seventy Acres Lake :Fishers Green 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-PGWL0173
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