Dwr Cymru Welsh Water has confirmed that it has agreed a £230 million loan facility with the European Investment Bank.
It says it will help it implement its £1.5 billion capital investment programme in the five years from April.
The not-for-profit company provides services to over three million people across much of Wales, Herefordshire and Deeside.
50 jobs have been created as Dwr Cymru Welsh Water's new water testing facility opened today in Newport.
The £10m facility will process 750,000 samples of water in Wales every year.
Dwr Cymru Welsh Water's new £10.4m water testing laboratory in Newport will be officially opened today.
The company says the facility, at Tredegar Park, employs 50 staff and will perform microbiological and chemical tests on samples of drinking water.
Dwr Cymru Welsh Water's Director of Waste Water says that most of the 2,000 blockages they deal with every month are caused by "everyday items put down the toilet such as wipes, sanitary towels, cotton buds and dental floss as well as fat, oil and grease that people have put down their drains."
Steve Wilson says many people aren’t aware that it is "illegal to throw or empty anything into our network that’s likely to damage a sewer or drain or to interfere with its free flow."
Dwr Cymru Welsh Water is urging people to stop flushing solid waste down sinks and drains as part of a new 12 month campaign to reduce sewer blockages.
The company says they deal with 28,000 blockages a year cost them around £7million.
The 'Let’s Stop the Block' campaign will aim to "change customer behaviour when it comes to putting things down the toilet and disposing of fat, oils and grease."
The programme includes visits to schools, shops and restaurants.
Welsh Water say they will target 'black spots' including Rhondda Cynon Taff, Caerphilly and the south Wales coast.
Dwr Cymru Welsh Water customers will see their average annual household bill rise by £7 from April.
It means it will increase to £434, which bosses say is the lowest average rise in Wales and England.
The company has more than a million customers.