Hampstead Heath (Mixed Pond) water quality history
Explore historical Environment Agency samples and annual bathing water classifications for Hampstead Heath (Mixed Pond) in City and County of the City of London.
The Mixed Pond is one of a series of ponds in the south-west corner of Hampstead Heath formed by the damming of the Hampstead Brook. Access to the 4,270 square metre swimming area is via a concrete diving platform. There is a charge for swimming. There is no beach but there is a grassy sunbathing area next to the diving platform.
- Available sample history
- 1998 to 2026
- Samples
- 564
- Latest official classification
- Excellent (2025)
Interactive charts are loading. The classification history is available below.
Annual classification history
Official assessments and historical estimates are labelled separately. Missing years are not filled in.
| Year | Classification | Assessment source |
|---|---|---|
| 2025 | Excellent | Official Environment Agency assessment |
| 2024 | Excellent | Official Environment Agency assessment |
| 2023 | Excellent | Official Environment Agency assessment |
| 2022 | Excellent | Official Environment Agency assessment |
| 2021 | Good | Official Environment Agency assessment |
| 2019 | Good | Official Environment Agency assessment |
| 2018 | Good | Official Environment Agency assessment |
| 2017 | Good | Official Environment Agency assessment |
| 2016 | Good | Official Environment Agency assessment |
| 2015 | Good | Official Environment Agency assessment |
| 2014 | Good | Official Environment Agency assessment |
| 2013 | Good | Official Environment Agency assessment |
| 2012 | Good | Official Environment Agency assessment |
| 2011 | Sufficient | Official Environment Agency assessment |
| 2010 | Good | Official Environment Agency assessment |
| 2009 | Sufficient | Historical estimate |
| 2008 | Sufficient | Historical estimate |
| 2007 | Sufficient | Historical estimate |
| 2006 | Sufficient | Historical estimate |
| 2005 | Sufficient | Historical estimate |
| 2004 | Sufficient | Historical estimate |
| 2003 | Sufficient | Historical estimate |
| 2002 | Sufficient | Historical estimate |
| 2001 | Sufficient | Historical estimate |
| 2000 | Poor | Historical estimate |
| 1999 | Poor | Historical estimate |
| 1998 | Poor | Historical estimate |
Source: Environment Agency / Swimfo. Data retrieved 16 October 2026. Historical trends do not describe conditions today; check Swimfo and local notices for current advice.
Nearby bathing waters
- Ham and Kingston, River ThamesKingston upon Thames
- Hampstead Heath (Ladies Pond)City and County of the City of London
- Hampstead Heath (Mens Pond)City and County of the City of London
- HoveThe City of Brighton and Hove
- SouthwickAdur
- The Serpentine - Hyde ParkCity of Westminster