Parks Victoria has been forced to do costly clean-up work after a spate of illegal dumping in Point Cook Coastal Park and the Cheetham Wetlands.

Speaking on World Wetlands Day, February 2, Ramsar project officer Steve Tuohy called on people to stop dumping rubbish along the internationally significant wetlands.

"With so many new housing estates being built in the area, there's a lot of new waste being dumped in the areas adjacent to the wetland, particularly around Sanctuary Lakes," he said.

Winds were also fanning waste into the waterways.

"When it ends up in the Cheetham Wetlands, it has an an awful impact on the habitats there, and seriously detracts from the value of the wetlands."

Mr Tuohy said Parks Victoria was investigating a number of dumping incidents detected during routine patrols or reported by worried residents.

"Point Cook has such beautiful native flora and fauna in its wetlands but then all of a sudden, there's washing machines, refrigerators, plastic bags, car tyres and household rubbish," he said.

A national survey by Birds Australia last year revealed Wyndham's wetlands as one of the best places in Victoria to spot the orange-bellied parrot.

The survey involved a team of skilled volunteers checking salt marshes, sewage farms, paddocks and golf courses around the state for the rare parrot, with the area between Queenscliff and Werribee found to be its preferred home.

The wetlands, which form part of the new Saltwater Coast estate, will continue to be cared for by Parks Victoria and developers to ensure migrating birds continue to return to Point Cook.