An Environmental Audit Overlay (EAO) on a property is a planning scheme indicator that the land has been used for a potentially contaminating activity — historical petrol station, dry cleaner, gasworks, panel beater, light industry, or gold-mining-era processing. The overlay requires either an Environmental Audit Statement or a Certificate of Environmental Audit before sensitive uses (residential, childcare, accommodation) can be developed or even used. Properties with an EAO trade at significant discounts and can require $15,000 to $300,000+ in remediation works.
This guide covers what EAOs mean, the difference between Environmental Audit Statements and Certificates, the new Environment Protection Act 2017 framework, and what every buyer should check.
The EAO planning trigger
Under the Victoria Planning Provisions, the Environmental Audit Overlay applies to properties where the planning authority has identified potentially contaminating prior use. The overlay requires that before sensitive use can occur, the land must be either:
- Audited as suitable via a Certificate of Environmental Audit issued by an EPA-appointed auditor; or
- Audited with conditions via an Environmental Audit Statement, which sets out the remediation works needed before sensitive use can begin.
Certificate vs Statement — what each means
| Document | Meaning | Buyer position |
|---|---|---|
| Certificate of Environmental Audit | Land is suitable for sensitive use | Lowest risk — no further works needed |
| Environmental Audit Statement | Suitable subject to conditions | Conditions transfer with title — review carefully |
| No audit completed | Cannot use for sensitive purposes | High risk — audit cost falls on buyer |
| Audit identifies contamination | Remediation required | Cost ranges from $15k to $300k+ |
Common contaminating prior uses
- Petrol stations. Underground fuel storage tanks (USTs) leak. Hydrocarbon contamination of soil and groundwater. Most former service stations carry EAO.
- Dry cleaners. Perchloroethylene (PCE) contamination. Particularly difficult to remediate. Common in inner-suburban shopfronts.
- Gasworks. Heavy metals, hydrocarbons, asbestos. Major Victorian gasworks sites in Carlton, South Melbourne, Footscray.
- Panel beaters and mechanic workshops. Heavy metals, solvents, used oils.
- Light industry. Chemical use varies by industry. Often EAO triggered.
- Gold-mining processing. Arsenic and mercury contamination on former goldfields. See our EAO arsenic mining theme.
- Tanneries, abattoirs, breweries. Heavy metal, biological, and chemical contamination.
- Tip / landfill sites. Methane gas, leachate, stability issues.
The 2021 Environment Protection Act 2017 framework
The new Environment Protection Act 2017, fully in force from July 2021, introduced:
- General environmental duty. All landowners have a duty to minimise risks of harm from contamination.
- Duty to notify. When contamination above notification thresholds is identified, the EPA must be informed.
- Duty to manage. Once aware of contamination, the landowner must take reasonable steps to manage it.
- Information duty on sale. Vendors must disclose known contamination to buyers (overlapping with Section 32K obligations).
These duties extend liability beyond the original polluter to current landowners. Buying a contaminated property means inheriting the duty to manage it.
Remediation costs
| Issue | Typical cost |
|---|---|
| Soil testing (Phase 1 + Phase 2) | $8k–$25k |
| Removal and replacement of UST | $15k–$80k |
| Hydrocarbon soil remediation (small) | $30k–$120k |
| Heavy metal remediation | $50k–$250k |
| PCE / dry cleaner solvent remediation | $80k–$400k |
| Audit certificate (auditor fees) | $15k–$45k |
| Cap and seal (containment, no removal) | $30k–$120k |
Section 32 and contract checks
- Council planning property report. Confirms EAO coverage.
- Audit document. Get the Certificate or Statement if one exists. Read full conditions.
- EPA register search. Public register of audited sites and contamination notices.
- Historical aerial photography. Confirms prior uses.
- Vendor disclosure. Direct question: are you aware of any contamination on the land?
- Independent contamination assessment. Pre-purchase contamination assessment by a qualified environmental consultant — $5,000–$15,000.
Special conditions
- Vendor warranty about no contamination beyond what is disclosed
- Vendor warranty about no EPA notices or orders
- Right to rescind if material contamination is identified
- Vendor procures Certificate of Environmental Audit before settlement (if needed)
- Long-stop date for completion of audit
Ready to check your contract? Upload your Section 32 or Contract of Sale at precontractreview.com for a pre-contract check — typically in just a few minutes.