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Why is My Water Pressure So Low? 7 Common Causes

Suddenly low water pressure is one of the most common plumbing complaints. The cause is usually one of these seven:

1. Clogged aerator

If only one faucet is low, unscrew the aerator (the little screen at the tip) and clean out the mineral debris.

2. Pressure regulator failing

Whole-house low pressure often points here. The pressure regulator near your main shutoff has a 7-12 year lifespan.

3. Mineral buildup in pipes

Older galvanized pipes accumulate scale over decades. The pipes get smaller and smaller until pressure drops noticeably.

4. Hidden leak

If there's a leak somewhere, pressure drops because water is escaping. Often paired with a higher water bill.

5. Closed or partially-closed shutoff

Check the main shutoff valve. Easy to overlook.

6. Water heater inlet clogged

If hot water pressure is low but cold is fine, look at the water heater inlet.

7. Municipal supply issue

Sometimes it's not you — it's the city. Check with neighbors.

When to call

If aerators are clean and the issue persists across multiple fixtures, call a plumber to test pressure at the main and isolate the cause.

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