Survey finding
Private water supply: what UK buyers need to know
Properties on private water supplies sit in a different regulatory and lender market. This page covers Regulations 2016 testing, mortgageability, and ongoing cost.
Last updated: 6 May 2026. Editorially reviewed: 20 May 2026.
Finding
Private water supply
What this usually means
Properties not connected to a public water supply rely on a private supply: borehole, spring, well, or private network. The Private Water Supplies Regulations 2016 (and devolved equivalents) require local authority assessment and periodic sampling. Quality, capacity, and seasonal reliability are the buyer questions.
Why it matters
Private water supplies are not defects but require ongoing maintenance and testing. Lenders are more cautious because supply quality affects mortgageability and resale. Some lenders restrict to specialist panels for private-supply properties.
Ask your surveyor
- Check:Where is the private supply and what is its general condition?
Ask the seller
- Check:What is the source of water, borehole, spring, well?
- Check:Is there a recent local-authority risk assessment?
Next steps
- •Get two written quotes from local trades before negotiating with the seller.
- •Speak to your mortgage broker before exchanging if the finding affects mortgageability.
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What you need to know
Severity
Significant. Specialist follow-up usually warranted before exchange.
Typical cost to fix
Local authority private supply risk assessment: £100–£500 (varies by council). Annual sampling: £150–£400. Borehole maintenance: £300–£1,500/year. New borehole drilling: £6,000–£15,000+.
Mortgage impact
Mainstream lenders accept private supplies if a recent local-authority risk assessment confirms compliance. Some lenders restrict to specialist panels.
Insurance impact
Standard buildings insurance covers the borehole/well structure; the supply itself is rarely insurable.
When to pull out
Pull out if quality testing fails, the supply is unreliable, and remediation cost is high.
When to renegotiate, and by how much
Insist on a recent local-authority risk assessment and 12 months of sampling data. If absent. The seller usually funds the assessment before exchange.
Thinking of pulling out or renegotiating? What to do after a bad survey
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Flood, subsidence, EPC, crime, schools, transport, broadband, tenure, age, listed status and price checks where data is available.
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How MyPropertyScan produces this guide, and what it is not
Published by MyPropertyScan and written by Ziad Nasr, who is accountable for its accuracy. No page here is written or reviewed by a chartered surveyor, conveyancer or regulated adviser, and we do not claim otherwise.
This page is not:
- Chartered surveying — we do not inspect properties or produce RICS Home Survey reports
- Legal advice — we do not act as conveyancers or advise on title, tenure or contracts
- Mortgage or insurance advice — we are not regulated by the FCA and give no recommendations
Figures and process steps come from the published UK datasets and standards listed on this page, not from professional practice. Pages are updated when source coverage, survey cost assumptions, or lender and legal requirements materially change. Dataset limitations are set out on the methodology page.
Spotted something out of date or wrong? Email hello@mypropertyscan.com and we will correct it and change the update date.
Sources used
We use UK public and specialist sources where they are available. Public datasets can be incomplete, delayed, or missing for some addresses. Treat them as a starting point, not as a replacement for professional advice.
Source standard: preference goes to official government datasets, statutory bodies, professional standards, and primary dataset publishers. We cite the source family on the page and explain coverage limits rather than filling gaps with unsupported estimates.
- Professional standard: RICS Home Survey StandardRICS standard for condition-based residential surveys in the UK.
- Learn more from: RICS consumer guide to surveysConsumer-facing guide to survey types and when each level is appropriate.
- Official guidance: GOV.UK buying or selling your homeGovernment overview of the home buying and selling process.