The average length of the spills for each national park site was 549 hours last year, according to a probe by water experts
Sewage is overflowing into rivers in national parks at twice the rate compared to outside the protected areas.
Latest figures show there are 464 water firm overflow sites inside national parks.
And the average length of the spills for each site was 549 hours last year.
The findings were last night branded “outrageous” by furious campaigners.
Dr Rose O’Neill, of the Campaign for National Parks (CNP), said: “National park rivers are being poisoned, drained and neglected – if we can’t protect these, we can’t claim to be serious about ending the UK’s water crisis.
“This outrageous level of sewage reflects ageing and poorly maintained infrastructure that is ill-designed.”
There were 254,808 hours of waste outflows in national parks last year.
And over half of the rivers in national parks are breaking green laws, the study by (CNP) and the Rivers Trust found.
The sites worst affected were Dartmoor, the South Downs and the Broads.
The research said slurry and fertiliser runoff from farms along with toxic pesticides were making our waters dirty.
Southern Water said: “Over the next five years, we’re targeting the four most active New Forest outfalls and 13 priority overflows in the South Downs, to bring all spills below the government targets. We’re also upgrading wastewater treatment works across both areas.”
South West Water said a quarter of the 62 combined sewage overflows in Dartmoor met the legal limit of fewer than 10 spills a year, with another quarter to be improved by 2035 and the rest by 2040.
United Utilities said it was “delivering the largest ever environmental investment programme in the north-west”.
The Department for Environment, Food and Rural Affairs said it is rebuilding sewage pipes to slash pollution levels in half with over £104bn of private investment.
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