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Studies show that, in 1987, a reported 30% of rivers were designated "high status", but that rating slumped to 17% by 2008.
Forestry, wind farms, and one off housing also threaten natural water Nike Zoom Kobe 8 System
The pristine sites are seen as fundamental to maintaining spawning grounds for fish and providing a refuge for biodiversity under threat from our developed landscape.
"The input of a few grammes of phosphorus or a slight increase in silt, for example, will have a much more damaging impact on the ecology of a pristine system than Nike Lebron 14 Images
Researcher Fiona Murphy of the RPS Group said that while there has been a reduction in serious pollution, there has been a dramatic loss of pristine waters, which have lost high status.
The quality of drinking water in "high status" rivers and lakes has dropped dramatically in recent years.
The report calls for much tighter planning controls in areas with pristine water catchments. It also urges control mechanisms on the use of pesticides, as well as on forestry and currently unregulated activities such as overgrazing in sensitive areas.
The risks to drinking water supplies are highlighted in a new Environmental Protection Agency report.
Ms Murphy said the smallest pressure can impact on water bodies that are in top condition.
High status waters such as rivers with healthy populations of freshwater pearl mussel or juvenile salmon require very high standards of protection.
The report draws from recent scientific studies and practices in other EU countries.
Drinking water quality hit
EPA deputy director general Dara Lynott said the report will contribute to the evidence base required to develop actions that will help prevent further loss to our cleanest rivers.
the same addition to an already polluted system," she said.
sources, while septic tank discharges and accidental releases of pollutants are other key factors.
"We're having problems in keeping high status sites and one of the main challenges is to retain that status," said Ms Murphy.
field drainage, the use of fertilisers and pesticides, and overgrazing are being cited as contributory factors.
Traditional farm activities such as Nike Metcon Black Friday Deal
Research funded by the EPA and undertaken by a project team led by Bernadette N Chathin of the RPS Group, has outlined Nike Metcon Volt strategies to protect pristine water bodies.
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