E1 - Episode 1

Aired: April 30, 2020

In Cumbria, an army of engineers are replacing parts of an ageing monster underground pipeline that transports millions of litres of water from Haweswater Reservoir to 2 million people every day.

E2 - Episode 2

Aired: May 07, 2020

Waste Warriors James and Andy battle to clear a newly formed fatberg underneath a busy street in Manchester. It is a monstrous mass of waste and fat that is 50 metres in length

E3 - Episode 3

Aired: May 14, 2020

In Cumbria, John and his army of engineers are midway through a mammoth plumbing job, replacing parts of an ageing monster underground pipeline

E4 - Episode 4

Aired: May 21, 2020

Geoff and his elite squad of sewage cleaners must scour the pumps deep inside a holding tank at Southport Treatment works, to ensure the waste doesn't back up into people's homes

E5 - Episode 5

Aired: May 28, 2020

Project director John and his team undertake a crucial test at a fresh water pipeline in the Lake District, and a garden in Rucorn, Cheshire, is being slowly submerged in sewage.

E6 - Episode 6

Aired: June 04, 2020

Steve and Mark face one of their toughest jobs ever and Stu and Ian tackle a potential pollution emergency.

E7 - Episode 7

Aired: July 28, 2020

Stuart tackles a 200-metre fatberg in Manchester, newly qualified "leak listener" Dan detects holes in the water company's network, and the Steves attract donkey attention.

E8 - Episode 8

Aired: August 07, 2020

The largest fatberg ever seen in the North West is proving an unbeatable enemy. At 400 tonnes and 350m long, it fills 40% of the main sewer system in the docks area of Liverpool.

E9 - Episode 9

Aired: October 15, 2020

In North Wales, engineer Luke and his team of mega plumbers are mid way through a project to replace a problematic two km section of pipe that has a history of large bursts.

E10 - Episode 10

Aired: October 22, 2020

In Liverpool city centre, a crack team of drainage engineers goes underground to clear a blocked sewer.

E11 - Episode 11

Aired: October 29, 2020

Docuseries following the workers who maintain Britain's water systems.

E12 - Episode 12

Aired: November 05, 2020

Docuseries following the workers who maintain Britain's water systems.