Officials say it is too early to speculate about the cause of flooding on a new-build estate in Denbighshire where residents claim they were given assurances their homes were safe.
Homeowners at Glasdir, Ruthin, evacuated properties after being alerted by a postman who spotted river levels rising dangerously high.
Nearby St Asaph was hardest hit on Tuesday where 500 homes were evacuated.
The local AM said it was disappointing families were not given more warning.
Glasdir estate homeowner Phil Jones said: “We have documentation saying that the chance of flooding actually occurring was one-in-a-1,000 years.
“Of course the more serious question is what happens in terms of not just next year but the next few months?”
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…we should be able to reduce risk through flood defence improvements and provide adequate flood warnings”
Clwyd West AM Darren Millar paid tribute to the work of emergency services for their fast response.
They discovered the body of an elderly woman in a property in St Asaph while evacuating flooded homes.
Mr Millar said: “Whilst we cannot prevent extreme weather conditions, we should be able to reduce risk through flood defence improvements and provide adequate flood warnings to those at risk, so it’s particularly disappointing that the Environment Agency’s flood alert system did not seem to provide timely warnings for some households, particularly in Ruthin.”
The Environment Agency has been asked to comment.