After years of being plagued by foul odours, Mandurah residents are planning to take the stink to State Parliament and demand action.
In 2024, the State Government confirmed C-Wise and CM Farms (a piggery) were the source of odours at the time.
However, those living downwind of the businesses say little has changed.
Wendy Bouquet is behind the protest and also the Facebook group Lakelands And Surrounds Stink since 2024.
C-Wise even threatened to sue Ms Bouquet in 2024 for defamation over Facebook posts that criticised its odour outputs.
“The repugnant smell is frequent enough to have a significant impact on our community lifestyle, health and wellbeing,” Ms Bouquet said.
“It is much more prevalent in summer, but it can appear at any time if the prevailing winds are favourable.
“Whenever there is a southerly we cop it. It hinders our ability to enjoy our backyards fully over summer, with some in the community feeling nauseated by it … evaporative systems just suck the stench into our homes. We cannot leave doors or windows open to let fresh air into our homes.”
Ms Bouquet is hoping the protest will result in some action on the smell.
C-Wise has invested more than $6m to upgrade its facility and residents hope this will alleviate the stench but there is no guarantee.
“I’m sick to death of people saying ‘but they were here first’,” Ms Bouquet said.
“The piggery was established in 1988 and the composting firm in 1996, so they weren’t here first and they have grown exponentially since then.
“The government rakes in billions on stamp duty on properties and the council slugs us with coastal living rates, but no one discounts any of that to even remotely cover what we suffer with this stench.
“I didn’t buy my home to live in what is akin to living in Satan’s crack.
“I’m sure the developers won’t be too happy to publicise that the land they have up for sale at premium prices comes with a little added extra ‘stench that permeates every nook and cranny’.”
Ms Bouquet is also hoping for assurances that the stench isn’t causing harm to the health of people living downwind.
At the end of 2025, the Department of Water and Environmental Regulation amended C-Wise’s operating licence to incorporate improvements including stronger odour planning and monitoring, infrastructure upgrades and pond treatments.
In March C-Wise began desludging and relining one of the ponds at the premises which resulted in an increase in odour emissions.
However, this work is intended to reduce odour in the long-term.
A spokesperson for C-Wise said it was not subject to an environmental protection notice.
“C-Wise remains committed to working co-operatively and constructively with the regulator while also providing accurate information to residents, stakeholders and Government representatives,” they said.
The licence for CM Farms was also modified with a requirement to upgrade infrastructure and the inclusion of a sludge management plan.
The rally is planned for November 10 at State Parliament from noon, with more details available via Facebook.