Water mains

MQT on 2005-07-20
Session date: 
July 20, 2005
Question By: 
Darren Johnson
City Hall Greens
Asked Of: 
The Mayor


Given the need to reduce water leakage rates in London but the obvious physical limitations on the amount of mains pipes that can be replaced, will you, in your dialogues with Thames Water, urge them to follow the lead of water companies in Yorkshire, South West, Wales and South East in embarking on a major refurbishment programme using semi-structural polyurethane technology? Although this technology has been shown to be cheaper, quicker to install and less disruptive to traffic than wholesale mains replacement will you endeavour to find out why this does not currently form part of Thames Water's leakage reduction programme even though it has been successfully adopted by other water companies?


Answer for Water mains

Answer for Water mains

Answered By: 
The Mayor

I am sure that you are aware that Thames Water missed its 2004/05 targets however during that period they have reduced leakages by 30 Ml/d (over 3%). OFWAT reported since March 2005 that leakages have decreased by 50 Ml/d, which is significantly better progress that they would expect. This is enough to supply the daily needs of 125,000 households (over 300,000 people).As I said in my response to Mike Tuffrey's question 1426 / 2005, I believe that my engagement with Thames Water and the Water Resources Working Group has played a major part in raising the issue and awareness of water leakage rates in London. My staff are currently investigating a wide range of water supply and management issues facing London. One issue is the amount of leakage and Thames Water's ongoing water mains replacement programme. This work will include assessing possible best practice technologies such as the one you refer to. Once I have come to a view about what needs to be done to speed up the way we tackle the problem of leaking mains, I will work with Thames Water and others to implement any new measures.