It took almost 7 hours and 10 minutes for an ambulance to arrive at a life-threatening emergency call in Co Waterford last year.
In 233 cases across the country, the response time was over three hours.
It comes ahead of an Oireachtas health committee meeting this morning, which will focus on the ambulance service.
David Hall, the chief executive of Lifeline Ambulance Service, says the new freedom of information figures are disturbing:
This is a very clear report and will be very disturbing and concerning not just for patients, but for all representatives around the country and the public.
They''ll be asking if I dial 999 or 112 in urgent need of an ambulance, how long am I going to be left waiting? How long do you wait for such transport?
Also there is an inherent risk or danger where people will get tempted to transport themselves to the hospital or their loved ones, which is very ill advised.
