Mr. Rooter Plumbing of San Francisco Change Location
24/7 Emergency Services (415) 906-2456 Request Job Estimate
woman's hand turning on bathroom faucet

What Causes a Faucet to Leak?

A small leak can be easy to ignore. But did you know that a leaky faucet that drips once per second can waste more than 3,000 gallons per year? That's the amount of water needed to take more than 180 showers!

With spring officially here, it’s so important to conserve water — our planet and your water bill will thank you.

Common Causes of a Leaking Faucet

Issues with the O-ring

Your faucet is made up of dozens of small parts. If even one begins to fail, it can quickly lead to a leak. If the o-ring, a stem screw that has a small disc attached to it, becomes loose or worn out, it will need to be replaced.


Any piece of equipment that’s in constant contact with water will inevitably become corroded. A valve seat, a piece that serves as a connection between the faucet and the spout, can be the most susceptible to corrosion and lead to a leak.

One of the best ways to prevent corrosion is to have the valve seat regularly cleaned by a professional.

A Poorly Installed Washer

If a washer isn’t installed correctly or if it’s not the correct size, it can cause leaks. If you need to install a new faucet or even just a new washer, we suggest leaving the job to a professional.

Mr. Rooter Plumbing has been assisting homeowners with their plumbing issues for decades, and our expertise is unmatched! To learn more, give us a call at (415) 906-2456 or fill out our form!