Carr Brook (Blackwell Brook Lake
Derbys Notts and Leics, 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 Carr Brook (Blackwell Brook Lake. Here is what has been measured.
- Limited data
Carr Brook (Blackwell Brook Lake in Derbys Notts and Leics, England has official water-quality measurements, shown as reported. Phosphorus: 100 µg/L. Chlorophyll-a (algae): 5.4 µg/L.
How Carr Brook (Blackwell Brook Lake is classified
Carr Brook (Blackwell Brook 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).
Carr Brook (Blackwell Brook Lake is a lake in Derbys Notts and Leics County, England.
Source: the Environment Agency (England) — not the EPA Water Quality Portal, last sampled 2022-03-02. 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 Carr Brook (Blackwell Brook 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 Carr Brook (Blackwell Brook Lake
These are the measurements EA publishes for Carr Brook (Blackwell Brook Lake. More on the source.
No clarity data. Phosphorus 100 µg/L. Chlorophyll-a 5.4 µg/L. TSI 59.
| 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 | 100µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 5.4µg/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. | 59 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Frequently asked questions about Carr Brook (Blackwell Brook Lake
Where is Carr Brook (Blackwell Brook Lake?
- Carr Brook (Blackwell Brook Lake is in Derbys Notts and Leics, 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 Carr Brook (Blackwell Brook Lake?
- Carr Brook (Blackwell Brook Lake in Derbys Notts and Leics, England has official water-quality measurements, shown as reported. Phosphorus: 100 µg/L. Chlorophyll-a (algae): 5.4 µg/L.
Is Carr Brook (Blackwell Brook Lake safe to swim in?
- Carr Brook (Blackwell Brook 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
112 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-wqa112 samples · 2016–2022
Monitoring station identifiers (1)
MD-53784835
Authority classifications are shown as the authority published them. See where the data comes from and data sources.