Definition
Water pressure is how hard water comes out of your faucets. Weak pressure (below 40 psi) can mean corroded pipes or other system issues; excessive pressure (above 80 psi) damages fixtures. Healthy pressure is 40-80 psi.
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Low water pressure (below 40 psi) results in weak shower flow and slow-filling fixtures. High pressure (above 80 psi) can damage fixtures and supply lines. Causes of low pressure include corrosion in supply lines, partially closed shutoff valves, municipal system issues, or failing pressure tanks in well systems. Inspectors test water pressure at multiple locations and assess pressure regulators. Inadequate pressure affects livability and may indicate system problems.
Pro Tip
If water pressure is weak, test multiple locations. System-wide weakness suggests main line problems; isolated weakness points to specific fixture issues.
Example
A home inspection revealed very low water pressure, particularly in upstairs bathrooms. Testing revealed severely corroded galvanized supply lines restricting flow. Replacement with modern PEX tubing restored adequate water pressure throughout the home.