What paperwork should you retain for a private water supply?

Why this is sensitive

A private supply must be safe to drink and adequate in volume. Buyers, mortgage lenders, and insurers may ask how risk is managed.

Records to keep

Risk assessment and monitoring: historic test results for bacteria and chemical parameters where tests exist.

Treatment and maintenance: UV units, filters, chlorination equipment, and service logs.

Storage and protection: tank inspection notes and cleaning evidence.

Pipework updates: when distribution pipework was renewed.

Attach maps showing borehole or spring capture points if you have them.

Using Property Passport UK

Start from the address on [Property Search](/search). When you own or manage the home, [claim your Property Passport](/claim/start) and upload Documents with clear dates and sources. Browse more explainers in the [Property Guides library](/guides). This article is general information, not legal, tax, mortgage, or survey advice.