Streams are also monitored to determine pollution levels and water is not collected and treated from any streams returning high readings for contamination.
Pesticide levels in the Vale Pond – which holds 250 million litres of water – increased 65% between 2019 and 2020. Water has not been collected from the Pond in recent years.
Guernsey Water blames the increase largely on glyphosate.
But Margaret McGuinness, Guernsey Water’s Quality Manager, said that “concentrations in the island’s streams are low when compared to other jurisdictions”.
Ms McGuinness added that “controlling pesticides at source is the most cost effective and sustainable method”.
“Therefore, to protect the island’s water resources, we encourage all land managers to follow good practice when applying any pesticides and fertilisers.”
She added that glyphosate is only one part of the problem, and any synthetic chemicals falling under the banner of pesticides, herbicides, insecticides, fungicides or fertilisers can have a polluting effect on the environment.
Guernsey Water is responsible for collecting, storing, treating and distributing water to over 25,000 homes and businesses.
Pictured: Deputy David De Lisle wants to see a partial ban on glyphosate extended to a full ban.
Retailers, such as garden centres, will be unable to import and sell products with glyphosate which are intended for amateur use, typically to control weeds on domestic properties.
The domestic use and storage of products will be banned on 31 December.
And he is not ruling out taking another Requête to the States’ Assembly to propose a complete ban which would make glyphosate illegal when used by accredited professionals as well as amateur householders.
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