The MP for Bridgwater and West Somerset, Ian Liddell-Grainger, has branded Environment Agency Chairman Lord Smith "a coward" for failing to face up to local residents in his constituency.
Lord Smith visited the Somerset Levels on Friday but Liddell-Grainger suggested his presence was futile as no one knew where he was.
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Mr Liddell-Grainger told The BBC: "I will tell him what I bloody well think of him - he should go, he should walk.
"I'm livid. This little git has never even been on the telephone to me. When I find out where he is, I will give it to him.
"He has not told the local MPs, the local council or the local press where he is going to be. He's a coward."
Smith did later face the press but refused a number of invitations to apologise to those affected by the floods, adding: "Our top priority is protecting lives, our second priority is protecting people's homes and people's businesses, our third priority is to protect as much agricultural land as we can."
As well as facing severe criticism from Conservative Liddell-Grainger, Lord Smith has incurred the wrath of local residents who have questioned why it has taken so long for him to visit flood-hit areas.
More homes were evacuated in Somerset as water levels rose even further while more wet weather is forecast for the coming days.
Some residents are still resisting police advice to leave their homes and an Avon and Somerset Constabulary spokesman said: "We have been informing local residents and strongly advising them to leave the area.
"Most are taking this advice and a rest centre has been established for those affected at Westfield Church on West Street, Bridgwater. The Royal Marines and search and rescue volunteers are assisting us with this."
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