Designated bathing water · official register
Hampstead Heath (Mens Pond)
City and County of the City of London
The Environment Agency's classification is good and no short-term pollution warning is active. Based on the EA classification Excellent (2025) and no active short-term pollution warning.
Latest EA sample· 15 Sept 2026
170
E. coli · cfu/100ml
82
Intestinal enterococci · cfu/100ml
This season's samples
In-season Environment Agency lab results, newest first. Water quality is more likely to be poor after heavy rain.
| Sampled | E. coli | Int. enterococci |
|---|---|---|
| 15 Sept 2026 | 170 | 82 |
| 3 Sept 2026 | 200 | 250 |
| 20 Jun 2026 | 170 | 140 |
cfu/100ml. ≥/≤ mark over- and under-range lab readings.
Storm overflows within 5.0 km
Monitored sewage discharge points near this bathing water, from the National Storm Overflow Hub. An active spill upstream can affect water quality before it shows up in lab samples.
14
Storm overflows
0
Spilling now
1
Monitors offline
0
Spills · 24 h
- Thames Water · TWL00571 · Dollis Brookoffline4.9 km
- Thames Water · TWL00574 · Dollis Brookinactive3.6 km
- Thames Water · TWL00591 · Dollis Brookinactive3.3 km
- Thames Water · TWL00320 · Decoy Brookinactive3.6 km
- Thames Water · TWL00225 · Decoy Brookinactive4.0 km
- Thames Water · TWL00590 · Dollis Brookinactive3.7 km
- Thames Water · TWL00613 · Dollis Brookinactive4.3 km
- Thames Water · TWL00321 · Decoy Brookinactive4.0 km
- Thames Water · TWL00484 · Dollis Brookinactive4.6 km
- Thames Water · TWL00762 · Stonebridge Brookinactive4.6 km
About this verdict
The classification, lab samples and pollution warnings above are the Environment Agency's own published data for this designated site; River Truth adds live storm-overflow context from the National Storm Overflow Hub. Sample results reflect water quality at the time of testing and this page is not formal bathing advice — heed any on-site signage.