Pseudonymising Drainage and Water Search Results for Property Transactions – UK GDPR-compliant anonymisation per UK GDPR
Drainage and water authority searches (CON29DW) confirm whether a property is connected to public sewers and water mains, and may reveal the location of public sewers crossing private land, together with correspondence or notices naming property owners or previous occupiers. anonym.legal pseudonymises those personal identifiers while preserving the substantive drainage and water infrastructure information needed for conveyancing due diligence.
When this applies
This task applies when CON29DW search results and supporting drainage correspondence are shared with a purchaser, their lender, or a development adviser who needs the infrastructure data but should not receive the personal data of named prior owners or occupiers referenced in drainage records.
How anonym.legal handles it
- Upload the CON29DW drainage and water search results and any accompanying sewer maps or correspondence.
- The engine identifies natural persons named in the search results, notices, or correspondence — typically prior owners or occupiers referenced in connection to sewer crossings or adoption agreements.
- Each individual is pseudonymised consistently; connection status, sewer locations, public adoption information, and infrastructure specifications are preserved.
- A mapping table is produced with UK/EU data residency.
- Release the pseudonymised results for due-diligence review; restore originals before lender submission.
What you provide
- CON29DW drainage and water search results
- Sewer map or record of public sewers (if provided separately)
- Any drainage correspondence naming individuals (if appended)
Limitations & cautions
- Drainage and water searches are provided by the relevant water authority or a regulated personal search company; the tool pseudonymises personal data in the results but does not verify their accuracy.
- Sewer adoption agreements are complex documents; if the adoption agreement names individual parties, those are pseudonymised separately — upload the adoption agreement as a separate document.
FAQ
Do drainage and water searches typically contain personal data?
Most CON29DW results are infrastructure-focused and contain little personal data. Where prior owner or occupier names appear in correspondence or adoption notices annexed to the search, those individuals are pseudonymised.
Is a CON29DW required by mortgage lenders?
Yes, most residential mortgage lenders require a CON29DW search. The original, un-pseudonymised results must be provided to the lender; the pseudonymised version is for preliminary client or adviser review.
Can this be combined with the local authority search workflow?
Yes. Upload the LLC1/CON29 and CON29DW search results together in a single batch for consistent pseudonymisation across the full pre-contract search pack.