Water Industry Operators Association of Australia will hold the fifth Best Tasting Tap Water in Australia competition on October 19.

The competition will take place at the 3 Peaks festival at Dunkeld, Victoria.

Tasmania's representative is TasWater's Mount Leslie Water Treatment Plant in Launceston.

Judging is by a blind taste test approach, with water to be tested on colour, clarity, odour, mouthfeel, and taste.

Water providers from across the country participated in state competitions throughout the year to get to the national competition.

WIOA chief operations officer Craig Mathisen said members of the public would be surprised to learn the complexities involved in delivering a high-quality water product each day.

"The competition is a testament to the excellent quality of Australian water and to the diligence and commitment of the operational employees who deliver it to our communities," he said.

"Many of us turn on taps for a drink, to cook and shower, with little consideration of what it takes to operate and maintain the water infrastructure.

"We want to celebrate our unsung heroes - the water operators and the maintenance crews who work all year-round to ensure we have high quality water, which is essential to keep us alive."

Other finalists included Shoalhaven Water's Bamarang Water Treatment Plant, Mackay Regional Council's Mackay Water Treatment Plant, SA Water's Swan Reach Water Treatment Plant, and Barwon Water's Geelong West Water Treatment Plant.