They make millions of pounds in profits every year. But that's not stopped water firms putting up prices above the rate of inflation. The increases from April will come just months after energy bills soared to a record high - putting increasing pressue on household budgets.
Thames Water sees the biggest rise, with a combined water and sewerage bill going up by 5.5% to an average of £354. Meanwhile, Southern Water bills are up 5.3% to £449. And customers who use Wessex Water in parts of Dorset and Wiltshire will see a 4.9% per cent rise, up to £478.
Chris Maughan has been meeting people in Reading who lost their water yesterday to see what they think.
Sangeeta spoke to Keith Mason from the water regulator OFWAT earlier. She started by asking him if they should be stopping water firms from raising their prices.