In a strongly-worded statement, the commission said, "Baseless, speculative and wild allegations are being made which deserve to be rejected."
The sharp reaction of the poll panel came after Mayawati and Chief Minister Arvind Kejriwal claimed that the machines were tampered with in recently concluded Assembly elections in five states.
The poll panel said it did not receive specific complaints or concrete material from political parties and candidates about alleged tampering of the EVMs during the election process, asserting that it is "fully satisfied with the integrity of electoral process using EVM".
"Such concerns about alleged tamperability of ECI-EVM have been raised earlier also since their introduction including before high court and the Supreme Court.
Also Read
"These allegations have been dismissed. ECI unequivocally reiterates that given effective technical and administrative safeguards, EVMs are not tamperable and integrity of electoral process is preserved," it said.
The EC's rebuttal came a day after Mayawati said she will move court against the alleged tampering of the EVMs.
Meanwhile, several former chief election commissioners said losing parties should not blame their loss on the EVMs.
In its statement, the commission said that so far, no one
has been able to actually demonstrate that the EVMs used by it can be tampered with or manipulated.
It said, "What has been demonstrated or claimed to have been demonstrated is on a privately assembled look-alike of ECI-EVMs and not the actual ECI-EVMs."
It recalled that the "controversy" over the reliability of the machines was raised by political parties after the 2009 Lok Sabha polls. "However, no specific allegation was raised nor could they prove before any court," the statement said.
It said in an "extraordinary" move in August 2009, it had invited those who had expressed reservations about the EVM to come and demonstrate the flaws in the machine.
Those invited included political parties, petitioners before various courts and some individuals who had been writing to the commission on this issue.
"The outcome of this exercise was that none of the persons, who were given the opportunity, could actually demonstrate any tamperability of the ECI-EVMs. They either failed or chose not to demonstrate," the poll panel said.