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include compounds used to control weeds (herbicides) and insects.
some areas, traces of the pesticides used on farms, roads, or gardens can find
their way into local watercourses and sources used for water supply.
is mostly due to rainwater washing them off crops or plants and out of the soil.
Britain the use of all pesticides is restricted to approved products and is
governed by regulations and codes of practice issued by the Department for the
Environment, Food and Rural Affairs (Defra).
UK water supply regulations and the European Union drinking water directives
set maximum permitted levels of these substances in drinking water. These
permitted levels are considerably lower than any associated with health
current legal UK limit for drinking water is 0.1µg/l of a particular pesticide (one
part for every 10 billion parts of water). However pesticides, particularly
herbicides, are often used in combinations, so if evidence is found of one,
then it is possible that another may be present too.
water must not have more than 0.5µg/l
of pesticides in total (five parts for every 10 billion parts of water). If
necessary, activated carbon filters are used at
treatment works to reduce any traces of pesticides in the water.
We work closely with local farmers to help
manage the use of pesticides to reduce the possibility of traces entering water
sources. This has been particularly successful with metaldehyde (slug bait).