Why the number matters
Everything you plan for a property flows through this number: how many bathrooms run at once, whether the garden gets sprinklers, whether stock tanks stay full in August. Lenders and appraisers may also take an interest in a documented, adequate water supply on rural loans.
August matters most. Wells are at their most honest in late summer when water tables sit lowest — a spring test can flatter a marginal well.
How a real flow test works
A proper test draws the well down over a sustained period — not a faucet check — and measures stabilized yield, recovery, and often the condition of the pump system along the way. It answers “what can this well actually do,” not “does water come out.”
On the buying side I schedule flow testing with the inspection window; on the selling side, a recent professional test is one of the cheapest pieces of buyer confidence you can purchase.
When yield is modest
A lower-GPM well is not automatically a dealbreaker. Storage tanks, pressure systems, and usage design let many valley households live comfortably on modest wells. What matters is knowing the number and pricing the property accordingly — surprise is the only true enemy.
Local rule of thumb: Test in the driest season you can, and never accept a faucet check as a flow test.