WA Contaminated Sites: A Blank Database Search Is Only the First Check

SEARCH THE RECORDS BEHIND THE MAPWA contamination enquiries before buying land

A public search is an intake step

A property may look like an ordinary residential site while its history raises a different question. Equally, an older house is not evidence of contamination. The correct starting point is records and a qualified assessment, not appearance. Save the address, lot details, intended use and a dated search result in the acquisition file. State the question clearly: what environmental information exists, what uncertainty remains, and could that uncertainty affect the proposed development? Do not label an unlisted property clean merely to complete a checklist.

Use both official record routes

DWER’s buying and selling fact sheet recommends checking the contaminated sites database and submitting Form 2 for departmental records, because the database does not list every site. Obtain both through your adviser and preserve the responses. The public search is useful for discovery; the departmental response can identify information the map did not show. Record which parcels were searched and when. A screenshot showing no result should remain a search record, not become an environmental clearance certificate.

Link the title to the environmental record

Have the property lawyer examine the current title and relevant memorials alongside the departmental documents. Use the same parcel identifiers in every enquiry, particularly where a larger holding was subdivided or street numbers changed. If a record relates to parent land or an adjoining parcel, ask the consultant to explain its relevance. Do not quietly discard a result because its address differs, and do not automatically apply it to the purchased land. The file should show how the connection was tested and what the adviser concluded.

Build a history that answers the development question

Ask the consultant what history is needed for the intended residential use, excavation depth and earthworks concept. Historic aerials, past activities, council records and earlier investigations may help frame that scope. Treat an agent’s account or neighbour’s recollection as a lead to verify rather than a technical conclusion. Identify missing periods in the site history. If a former use is potentially relevant, the consultant should decide what further assessment is appropriate. Do not commission random soil sampling and assume it answers every environmental question.

Distinguish classification from proposed-use suitability

The official contaminated-sites service is the proper route into classification information and departmental records. Ask the consultant to explain any classification, restrictions and remaining investigation needs in terms of your actual concept. A record may need interpretation against excavation, gardens, groundwater use or residential occupation. This article does not determine what any classification permits. Require a written conclusion that names its evidence and limits, rather than reducing a detailed report to a green tick in the feasibility spreadsheet.

Worked decision: a clean-looking existing dwelling

Imagine a house marketed for redevelopment produces no public-database result. Before making an unconditional offer, your team requests the departmental record, checks title history and asks the consultant to scope historical enquiries. If those enquiries disclose a former activity needing investigation, the acquisition decision changes from assumed absence to an identified uncertainty. Ask the lawyer how to reflect the investigation period and its outcome in the contract. The consultant should specify the work; the lawyer should advise on the contractual response. Neither task belongs to the sales brochure.

Budget for information before budgeting a remedy

Keep three allowances separate: investigation, any justified remediation scenario, and time or redesign exposure. Do not invent a clean-up cost before the consultant has a defensible scope, and do not enter zero because no quote exists. Mark the unknown and decide whether more information, a contract protection or withdrawal is appropriate. Have the estimator use the consultant’s actual earthworks and handling assumptions. Environmental advice should inform the base case, while unconfirmed solutions remain conditional scenarios with explicit decision points and responsible reviewers.

TPC deal lens: close the evidence gap

You are not expected to solve this yourself. Give the environmental consultant the intended use and complete record set, and ask the property lawyer to reconcile title and contract issues. Preserve the dated conclusions and any further-work requirement. Key takeaway: a blank public search is one piece of evidence, not a clean-site verdict. Your turn: can your acquisition file show both official record enquiries and explain who decided whether the available history was sufficient for the development you intend to undertake?

Your specialist handover checklist

1. Save the dated public-database search for the correct parcels.
2. Request the departmental record through Form 2.
3. Have the lawyer reconcile title memorials and parcel history.
4. Give the consultant the proposed use and historical information.
5. Record the investigation decision and any unresolved contract condition.

Image credit: ANGIE BAONGOC / Unsplash. Illustrative photograph. Source · Licence Cropped and resized from the original; no content retouching.

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