"Our drowning death toll has been in decline over the past two decades, but, tragically, this year the trend has reversed," Mr Claridge said.
Seven people drowned in the Manawatu-Wanganui region in 1010, five of those in the Wanganui district. One drowned in a swimming pool and four in rivers after road accidents.
People flocking to beaches, lakes and rivers were reminded to use common sense this summer.
"Wear lifejackets, check the weather forecast, stay within your limits, don't swim alone and avoid alcohol.
"It's not rocket science but it could save your life," Mr Claridge said.
He encouraged parents and caregivers to get into the water with children, keep them in sight and stay close enough to go to their help immediately.
TOP TIPS FOR WATER SAFETY
Stop and think before entering the water
Keep children within sight and arm's reach
Alcohol and water activities don't mix
Swim and dive with a buddy
Check the marine forecast before boating
Wear a life jacket when boating
Stay within your swimming limits
Swim between the flags, if any
Check water depth before diving in
Learn to swim if you don't know how