An independent review is to be held into the partial collapse of the reservoir dam in Whaley Bridge.
More than 1,500 people were ordered to evacuate the town last month, amid fears the dam could collapse and threaten the lives of residents.
Environment Secretary Theresa Villiers said the review would examine what caused the damage and whether it could have been prevented.
High Peak MP Ruth George, who lives in Whaley Bridge, said: "I'm glad there will be an independent review of the causes of Toddbrook Dam to recommend the most appropriate long term repairs.
"We have a commitment that the dam will be repaired and I will be holding the government to that commitment."
Repairs to the Toddbrook Reservoir dam are expected to take up to three years.
An interim report is expected to be completed before the end of this year.
During the emergency evacuation in Whaley Bridge, the fire service continually pumped water from the reservoir while an RAF Chinook was used to shore up the damaged spillway, using 500 bags of aggregate.
Residents were allowed to return home when it was deemed the structure was no longer at risk of collapse.