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In Western Australia, the legal framework for identifying, classifying and managing contaminated land is set out under the Contaminated Sites Act 2003 (CSA). For site owners, developers and prospective buyers, understanding the Act’s requirements is essential to avoid delays, unexpected costs and potential liabilities.
West Soil & Water offers a host of contaminated land investigation and remediation services, all designed to meet legal obligations. This post outlines what those obligations are and how our services help you prove your project’s compliance.
As mandated by the Act, a thorough contaminated site investigation is the first step in redevelopment. At West Soil & Water, we offer two kinds:
Phase 1 Environmental Site Assessments (including desktop studies and site history reviews)
Phase 2 Environmental Site Assessments (involving more targeted soil, groundwater and vapour sampling)
They are designed to identify potential risks, confirm the presence and extent of contamination and produce the documentation regulators demand. In practice, this means less uncertainty, reduced risk of penalties and smooth progress for your transaction and development
If investigations determine the presence of a contaminant, the site will then be assessed and classified under the Act. These classifications include:
Contaminated – remediation required
Contaminated – restricted use
Possibly contaminated – investigation required
Remediated for restricted use
Decontaminated
Each classification carries different implications for the land. This will determine how it can be used and whether further investigation or remediation services are necessary.
Aside from investigations and classifications, there are a number of smaller requirements laid out in the CSA:
Duty to report contamination: Any person who knows, or suspects, that a site is contaminated is legally required to notify DWER.
Disclosure in property transactions: If a site is classified as contaminated, this must be disclosed to prospective buyers or lessees
Liability for remediation: Under the Act, the “polluter pays” principle applies, meaning that those responsible for contamination are generally required to fund remediation.
Independent and accredited auditors: DWER recognises the role of this parties in reviews and endorsing investigations and remediation plans.
Proper assessment and documentation is the surest way to avoid issues with these obligations.
Failure to meet your obligations can result in significant financial and legal consequences. Site owners and other parties responsible for contamination can face enforcement notices that compel immediate investigation and remediation.
Ignoring an enforcement notice can lead to fines, approval delays and restrictions on land use. Consequences can, however, go beyond regulatory penalties. Non-compliance often leads to reputational harm and a loss of stakeholder confidence, particularly when there is a potential for environmental and community impacts.
It is also important to understand that liabilities can extend to new owners if contamination was not disclosed in a property transaction. Although you may not be responsible for contamination, you can still face penalties for its poor management.
By addressing contamination risks early and transparently, property owners can avoid the escalating costs and setbacks associated with these penalties.
At WSW, our consultants create structured, practical approaches to meeting contaminated land management obligations. Our Phase 1 and 2 environmental site assessments are developed to align with DWER’s wider regulatory framework, ensuring that risks are clearly identified and managed from the outset.
Our services also extend to remediation, where we design cost-effective strategies to address contamination in line with government requirements and project goals. When you work with our team, you can move forward with confidence knowing your site has been properly assessed and its environmental risks managed effectively.
The Contaminated Sites Act 2003 places clear responsibilities on landowners, developers and sellers in WA. Understanding your obligations protects against penalties and ensures that land can be safely and productively used.
If you would like to learn more about our contaminated land services and how we can ensure your site’s compliance, contact West Soil & Water.
Below, you can find a brief list of steps that keep your project in line with regulations.
To ensure your site is compliant with the CSA, follow these steps:
Engage West Soil & Water – to ensure you can navigate regulations with confidence
Check the Contaminated Sites Database – confirm if the land is listed as contaminated and, if so, its classification.
Identify known or suspected contamination – within soil, groundwater and other materials.
Disclose contamination – ensure buyers or lessees are informed as required.
Conduct an investigation – start with a preliminary site investigation and conduct a detailed assessment if risks are present.
Clarify liability – determine who is responsible for remediation and ensure it is documented.