The panel, including Michelin-starred chef Tom Aikens, gave 10 firms’ samples a mark out of five for clarity, smell and most importantly taste.
One panellist described water from Severn Trent, which covers large parts of the Midlands and mid-Wales, as like “a mountain stream of freshness”.
Anglian Water was second, Thames Water was third but Wessex Water came last.
Judges gave marks in a blind taste test at the Chelsea-based restaurant Tom’s Kitchen in London.
Mr Aikens described Severn Trent Water as having a “clean taste” and being “very fresh”.
Richard Rotti, head of wines at Annabel’s and a panellist, said the water was “beautifully pure, a mountain stream of freshness”.
Severn Trent said it took the production of high quality drinking water seriously.
The company covers Birmingham, Derbyshire, Gloucestershire, Nottingham, Leicester and parts of mid-Wales.
Anglian Water, which covers East Anglia and parts of the East Midlands, was placed second.
In third place was Thames Water, which covers Oxfordshire, London, Wiltshire, north Kent, Thames Valley and Surrey.
The British Soft Drinks Association said the survey showed that each type of water had a different taste – and stressed that was true of bottled water too.
“Bottled water has the added advantage of being naturally pure and not treated with chemicals. Over 30 million people in the UK choose to drink bottled water knowing it is completely traceable and comes from fully sustainable sources.”
The tasting competition was set up to celebrate the launch of a new initiative from the environmental group Green Thing.
The Drink Tap campaign will encourage people to stop drinking bottled water and switch to tap water during August.