The cream award was the fifth time in six years the product had claimed the prestigious title.
Bannister Downs Dairy managing director Sue Daubney said the result was a proud moment for the team.
“We’re very proud to be recognised for producing premium-quality milk, cream and flavoured milk,” she said.
“Each week we make 11 different products, and every single product was awarded with a gold or silver medal.”
Bannister Downs milk and cream were also used by other producers which scored gold, with the champion butter award going to The Butter People, and champion cheese awarded to Cambray Cheese in Nannup.
Cambray Cheese’s washed rind brie also went on to be named the overall grand champion product of the competition.
Mrs Daubney said the awards reflected the work and care of the Bannister Downs team.
“We know happy, healthy cows produce the best milk, and are dedicated to this,” she said.
“These fantastic awards in each category show that we do continue to produce premium milks and creams.”