The British Geological Survey (BGS) has refreshed the catalogue record for its Contaminated Land dataset covering projects undertaken for local authorities through its commercial ConSEPT work.
Live checking of the published record shows that it was added to the National Data Library on 30 September 2026 and lists an update date of 2 October 2026. That is the date shown on the live record, rather than 16 October 2026. The entry is principally a metadata refresh: it describes the information assembled for the projects, but does not create an openly downloadable register of all local-authority contaminated-land records.
For environmental consultants, developers, landowners and acquiring parties, the important point is not that a new national screening product has been released. It is that BGS has clearly restated the multi-source evidence base used in these local-authority assignments, alongside the access constraints that apply to portions of the resulting project information.
What the record confirms
The ConSEPT work drew together published BGS information, including borehole records, geological mapping at 1:50,000 and 1:10,000 scales, and water-well information. It also used third-party information held for local authorities, including polygons representing current and historic land uses and landfill-site information, to build project GIS systems.
This is a useful reminder that a credible contaminated-land desk study is rarely based on one source. Historic industrial activity may explain a possible contaminant source, but geology can influence the distribution of made ground and natural deposits; borehole logs can provide local evidence of previous ground conditions; and hydrogeological information can affect the plausibility of migration towards groundwater or other receptors.
Equally, landfill records and historic mapping need interpretation. Their presence near a site does not itself establish an unacceptable risk, while their absence in a particular dataset should not be treated as proof that no former waste disposal, infilling or potentially contaminative activity occurred. Data age, mapping precision, site boundary changes and gaps in historic coverage all matter.
Commercial confidentiality remains a practical constraint
The updated BGS entry expressly states that some project data and the projects themselves are commercially confidential and should not be shared. This is a material qualification for anyone expecting the listing to provide direct access to local-authority contamination intelligence or a comprehensive national GIS layer.
In practice, organisations should not assume that a historic ConSEPT commission can be obtained, relied upon or reproduced simply because the underlying catalogue record is public. Project-specific outputs may have been commissioned for a defined client purpose, may include third-party material, and may be subject to contractual, copyright or other access restrictions. The BGS entry also notes that use of information supplied by BGS is at the customer’s risk and that no warranty is given as to its suitability for a particular use.
That does not reduce the value of the information sources. It means that due diligence teams should establish early which records can actually be accessed, who owns any earlier reports, whether their scope is appropriate for the proposed transaction or development, and whether permissions are needed before material is circulated to funders, purchasers or contractors.
Implications for Phase 1 work
The Environment Agency’s Land Contamination Risk Management Stage 1 guidance supports this layered approach. It says a preliminary risk assessment should start with a desk study and site walkover, develop an initial conceptual site model, identify potential contaminant linkages and decide whether further work is required.
For a site being acquired, promoted or taken through planning, the refreshed BGS record is therefore best read as a prompt to test the completeness of the evidence package rather than as a substitute for assessment. A proportionate review should consider:
- the site’s present and historic uses, plus relevant activity on adjoining land;
- available borehole, geological and hydrogeological evidence;
- records of landfilling, infilling, waste handling, tanks, industrial processes and previous remediation;
- the likely receptors under the existing and proposed use, including people, controlled waters, buildings and ecology where relevant;
- the quality, date, geographical coverage and limitations of each information source; and
- whether uncertainties are significant enough to warrant an exploratory or detailed intrusive investigation.
Importantly, a source-pathway-receptor linkage needs to be plausible before contamination presents a risk requiring further assessment. The presence of a former industrial use or a mapped landfill nearby may justify targeted enquiry, but it does not automatically mean that remediation or intrusive investigation will be necessary. Conversely, a superficially benign current use may conceal legacy risks that become more relevant when redevelopment introduces new pathways or sensitive receptors.
What organisations should consider next
There is no new statutory deadline, legal duty or planning requirement created by this catalogue update. Requirements will continue to depend on the regulatory context, site circumstances and any conditions or information requests imposed by the relevant local planning authority or other regulator.
However, teams preparing a Phase 1 assessment, planning submission, acquisition review or remediation strategy should use the update as a timely quality-control point. Confirm the date and provenance of available reports, seek local-authority information through the appropriate route where needed, record data gaps openly, and ensure the conceptual site model distinguishes verified facts from assumptions. Where confidential legacy material is known to exist but cannot be reviewed, that limitation should be stated clearly and reflected in the scope of any subsequent investigation.
The main lesson from the BGS refresh is straightforward: contaminated-land screening depends on assembling several evidence layers, but the availability and permissions attached to those layers can be as important as the data itself.