Anthony Lorenzo came across a big hole lined with plastic at the end of Bridgewater Boulevard while walking his dogs in the vacant land.

Mr Lorenzo said the hole had become filled with water during recent rains and labelled it a hazard for young children playing near the area.

“Now that the rainy season is here it is filling with water and being unfenced a small unsupervised child playing in the area could easily slip or fall in and drown,” he said.

Mr Lorenzo said the hole had been there for some time and altered the City of Mandurah to the problem.

In the letter, Mr Lorenzo said the hole was also a health hazard and could lead to a breeding ground for mosquitoes.

The Mail took a walk through the Bridgewater bushland with Mr Lorenzo and found a large amount of rubbish, car bodies and old whitegoods littering the area.

“It is an eyesore and irresponsible people are using it as a dumping ground,” he said.

Mr Lorenzo said damage was being done to the environment and hoons drove through the area in four-wheel-drives.

The City of Mandurah asked developers Mirvac, the owners of the private land, to remove rubbish from the hole and fill it in.

Yesterday a Mirvac spokesman said the temporary hole had since been filled in.

The hole was being used as a de-watering pond for site earthworks and all associated approvals were sought from the relevant authorities.

Plans are underway to fence off the area.