Buying a home with a well: ask about quality and supply.

Put the well on your inspection plan as soon as you identify a property. Keep the water-quality review and the equipment and supply review as separate tasks, with qualified professionals explaining each result.

Start with records

• Request well construction records, available permits and the location of the well.
• Collect water-quality reports, pump service records and treatment-system details.
• For a shared well, request the recorded agreement and ask who handles costs, access and repairs.
• Ask a well professional what supply and equipment evaluation suits your intended household and land use.

Choose testing for the property

The California Water Boards recommend annual domestic-well water-quality testing. Ask the local environmental health department and a qualified laboratory which contaminants to test for, how to collect samples and how to interpret results. Do not assume a seller’s old test answers every current question.

In California, local jurisdictions oversee well construction, alteration and destruction. Use DWR’s permitting-agency directory to find the right office before planning well work.

Bring it back to your budget

Ask for written findings and estimates for any recommended work. Your decision should account for the cost of evaluation, treatment, equipment maintenance and any confirmed repair needs.

Official sources & next steps

• California Water Boards · Domestic well testing
• California DWR · Well permitting agencies

Checked October 2, 2026. Program funding, eligibility and local requirements can change. Confirm details with the administering agency or qualified professional before making a financial or property decision.