Low Water Pressure? 5 Causes and How to Fix Each One
Weak water pressure makes showers miserable and dishes impossible. Here are the 5 most common causes and their fixes.
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How to Diagnose the Problem
First, determine if the low pressure affects one fixture or the whole house. One fixture means a local problem. The whole house means a systemic issue. Test multiple faucets, showers, and outdoor spigots to narrow it down.
Cause 1: Clogged Aerator
The aerator is the small screen at the tip of your faucet. Mineral deposits clog it over time. Unscrew it, soak in white vinegar for an hour, scrub with an old toothbrush, and reinstall. This is the most common cause at a single faucet.
Cause 2: Partially Closed Shut-Off Valve
Check the shut-off valves under the affected fixture — they should be fully open. Also check the main shut-off valve where the water line enters your house.
Cause 3: Failing Pressure Regulator
If your whole house has low pressure, the pressure regulator may be failing. Turn the screw clockwise to increase pressure. If adjusting does not help, the regulator needs replacement.
Cause 4: Pipe Corrosion
Older homes with galvanized steel pipes develop internal corrosion that restricts water flow. If your home was built before 1970 and you have widespread low pressure, corroded pipes are likely the cause. The fix is repiping.
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