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Guernsey's douits, streams, reservoirs and groundwater are at risk of pollution by small residues of pesticides, some of which are not easily removed by water treatment processes. Safe drinking water limits are set extremely low at 100 nanograms per litre, (0.1 parts per billion).


As a result of pesticide pollution, we are currently unable to collect approximately 250million litres of water annually.

With greater droughts predicted for the future, the quality of the island's raw water resources has never been so important. Together we need to work to ensure we are able to process water when it is needed, without having to waste any as a result of pesticide pollution.

We are asking Islanders to consider their use of herbicides and insecticides carefully. If trends continue to rise, water restrictions may become necessary under drought conditions and significant investment may be needed to ensure the Island's water treatment works are able to effectively treat polluted water, this will come at a significant cost and a likely increase to customer bills.

Help to protect the Island's water resources and environment by using alternatives to herbicides and insecticides. If you do need to use them, use them responsibly in line with the guidelines below.

  • Don't spray near streams, ditches or surface water gullies
  • Don't spray on paved surfaces - use a weed gel instead
  • Don't use in windy conditions or if rain is forecast

You can also help to spread the message by sharing our posts on social media, sharing alternatives with those who may be considering pesticide use, or sharing and displaying information via the below printable flyers.


pdf icon Responsible pesticide use [166kb]


Responsibility to our customers and the environment

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