A study on the ponds of Hampstead Heath that dogs swim in has shown that they contain high levels of invertebrate-harming pesticides.
These chemicals, imidacloprid and fipronil, are present in many dogs’ flea treatment and enter the water through these treatments that wash off a dog’s fur when they go swimming.
The study was conducted by testing ponds on the Heath where dogs are not allowed to swim as a control variable, allowing the authors to isolate the dogs as an issue.
A spokesperson for the City of London Corporation, which manages Hampstead Heath as a registered charity, said: “Hampstead Heath is a registered charity and a Site of Metropolitan Importance for Nature Conservation.
“Our three dog-friendly ponds are a popular spot for pet owners, particularly in the summer months.
“The use of modern flea and tick treatments can have a harmful effect on invertebrates which call these ponds their home.
“We are in the early stages of working with the Heath & Hampstead Society, and our partners, to investigate the impact of these treatments on the local water environment and biodiversity.”
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