Michael Gove is to summon water company chief executives to explain why they have failed to meet leakage targets as the country struggles to cope with the dry summer.

The environment secretary said customers expect a "reliable and resilient water supply" following reports of low levels in some reservoirs and the introduction by North West supplier United Utilities of a hosepipe ban from August 5.

It comes as farmers were also due to meet with Government officials for a "drought summit" to discuss the effect of the heatwave on the country's food supplies.

The first half of the summer in the UK has been the driest since 1961 with Friday's wet weather and storms the first rainfall in weeks.

United Utilities has been accused of "wasting" 430 million litres of water every day from leakages but claims that "reducing leaks is a top priority".

The GMB union said earlier this month that its research showed that the firm was allowing 175 Olympic-sized swimming pools' worth of water to go "down the plughole" every day.

Mr Gove said that water companies "have much more to do to tackle leakage", adding: "That is why I have repeatedly made clear that companies must improve and recently wrote to them to outline my expectations during this period of dry weather.

"Next week I will ask the chief executives of the water companies that have failed to meet their leakage targets to a meeting at Defra to discuss how they are going to address this serious issue and improve their performance."

Irrigation water shortages, a lack of fresh forage for animals and growing conditions for cereal crops are among issues that will be discussed at separate talks chaired by National Farmers' Union president Minette Batters.

She will sit down on Wednesday with officials from Defra and rural agencies after a July that has seen England receive just 15 per cent of its long-term average rainfall.

Ms Batters described the situation as "hugely challenging" for all sectors of farming, warning that the thunderstorms and showers some areas are receiving "won't mitigate the many issues farmers are experiencing".

"There could be serious concerns for many farmers if this extended spell of warmer, drier weather continues as the long-range forecast suggests," she said.

"This unprecedented spell of weather really should be a wake-up call for us all. It's a timely reminder that we shouldn't take food production for granted.

"Farming is one of the most affected industries when it comes to managing volatility."

Those due to attend the summit alongside Defra include the Environment Agency, Natural England, the Rural Payments Agency (RPA) and farming charities RABI and Farming Community Network, the NFU said.

Last week the Environment Agency said it had responded to 44 "significant" environmental incidents since the end of June, including moorland fires, algal blooms, dry boreholes, low river flows and fish rescues.

Historic sites across UK exposed by heatwave Show all 15 1 /15 Historic sites across UK exposed by heatwave Historic sites across UK exposed by heatwave Crop marks show of the old garden at Gawthorpe Hall, Lancashire Lancashire Council / SWNS.com Historic sites across UK exposed by heatwave Garden at Gawthorpe Hall, Lancashire which was taken out in the 1940's but can now be seen again through the parched grass Lancashire Council / SWNS.com Historic sites across UK exposed by heatwave Remnants of WWII Air raid shelters on Jesus Green in Cambridge show up in the parched grass SWNS.com Historic sites across UK exposed by heatwave Old crop marks in Norfolk show up Mike Page / SWNS.com Historic sites across UK exposed by heatwave Info showing how crop marks are made SWNS.com Historic sites across UK exposed by heatwave Old parts of RAF Lasham's airfield show up in the parched grass in Hampshire Jordan Bridge / SWNS.com Historic sites across UK exposed by heatwave Crop marks near Langstone, Newport RCAHMW / SWNS.com Historic sites across UK exposed by heatwave Crop marks show in Tregaron, Wales RCAHMW/SWNS Historic sites across UK exposed by heatwave Remnants of Caistor Roman town in Norfolk Mike Page / SWNS.com Historic sites across UK exposed by heatwave Penllwyn Roman fort in Ceregigion, Wales RCAHMW / SWNS.com Historic sites across UK exposed by heatwave Crop marks show in Tregaron, Wales RCAHMW / SWNS.com Historic sites across UK exposed by heatwave Old parts of RAF Lasham's airfield Jordan Bridge / SWNS.com Historic sites across UK exposed by heatwave Roman site near Magor, South Wales RCAHMW / SWNS.com Historic sites across UK exposed by heatwave Old crop marks in Norfolk Mike Page / SWNS.com Historic sites across UK exposed by heatwave Cross Oak hill fort in Talybont, Wales RCAHMW / SWNS.com

The last month of dry, hot weather followed the driest June since 1925, the Environment Agency said. It has seen the water level in many reservoirs fall dramatically.

While only one water company is currently planning a hosepipe ban, continued dry weather into the autumn could see a risk of further restrictions and impacts on the environment, the National Drought Group said.