Ask House Spouse · Plumbing · Faucets, Toilets & Fixtures
Why is water pressure low at only one faucet?
Short answer
Low pressure at one fixture is almost always the aerator or the fixture cartridge — not a house-wide issue. Unscrew the aerator (the little screen at the tip of the spout), rinse it, and try again. If it's a shower, the head itself may be limed up. Pressure issues affecting the whole house are different and need a PRV check.
Aerators first, always
Sediment and mineral buildup from PNW water hits aerators before anything else. Unscrew, tap it out, rinse under running water, or soak in vinegar for 20 minutes. This fix solves ~70% of one-fixture pressure complaints.
Shower heads
Same rule: unscrew, soak in vinegar (a plastic bag rubber-banded around it works), rescrew. If it still dribbles, replace — a decent shower head is $30–$80.
When it's actually the cartridge
If the aerator is clean and the fixture is 15+ years old, the internal cartridge is worn or clogged with debris from a past water shutoff. Cartridge replacement is a handyman task; parts are $25–$60 depending on brand.
What we see on Home Health Assessments
Based on real experience across Snohomish and King County, plumbing issues like this are among the ones homeowners most often miss until they become expensive. Our Home Health Assessment catches them early — while they're still a maintenance item, not a repair.
How the Home Health Assessment worksServices we'd bring to this job
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