Swimmers and others involved in water-based activities have been urged to think of their safety at all times in order to avoid drowning tragedies.
Chairman of Irish Water Safety (IWS) Frank Nolan said thousands of people would enjoy summer days at lakes rivers and beaches, but he urged them to be vigilant.
"Water-related tragedies happen in the blink of an eye. It is a tragedy that 149 lives were lost to drowning last year - 1,700 in the last 10 years."
"Swimming at lifeguarded waterways instead of lonely, unfrequented beaches means you can swim safe in the knowledge that a trained lifesaver is always close by.
"Swimming in the early morning and late at night, without lifeguard supervision dramatically reduces your chances of being saved if you and your friends get into difficulties," said Mr Nolan.
"No matter how you plan to enjoy the water, remember that after all your ultimate goal is to relax, enjoy the water and get home safely."
Mr Nolan warned that cold water, currents and other conditions on the open water require more energy than swimming in a pool.
"If you're not in shape, you might have a hard time making it back to shore. As with any activity that you're not doing regularly, start out slowly."
The IWS chair also urged people to be vigilant while abroad, warning that "picture-postcard scenes" could often mask hidden dangers. Anyone involved in swimming or water sports should also avoid alcohol and should take special care to keep an eye on children playing near water.