DIY May Be Possible Avg. cost: $150
Leaking Faucet: Causes, Fixes & When to Call a Plumber
A dripping faucet is caused by a worn washer, O-ring, or cartridge. Turn off the water supply under the sink, replace the faulty part, and restore flow. Most repairs cost $75–$250 if done by a plumber.
What Causes Leaking Faucet?
- Worn rubber washers or seat washers
- Damaged O-rings on ball or cartridge faucets
- Corroded valve seat
- Loose packing nut
- Worn-out cartridge (in cartridge faucets)
How to Fix Dripping Faucet: Step-by-Step
- 1Turn off water supply valves under the sink
- 2Plug the drain to catch any dropped parts
- 3Remove the handle by unscrewing the decorative cap and handle screw
- 4Replace the washer, O-ring, or cartridge (bring old part to hardware store for matching)
- 5Reassemble in reverse order and test
When Should You Call a Plumber?
Call a plumber if the faucet is a specialty brand, the leak is at the base of the spout (indicating a cracked body), multiple faucets are leaking, or you're not confident repairing it yourself.
How Much Does Dripping Faucet Repair Cost?
Average Cost $150
Typical Range $75 – $300
Costs vary by location, severity, and whether emergency service is needed. Prices shown are national averages. Get a free quote from a local plumber →
Frequently Asked Questions About Dripping Faucet
- One drop per second equals about 3,000 gallons per year — enough to fill 50 bathtubs. At average US water rates, that's $20–$50 added to your annual bill.
- This suggests the hot-side cartridge or washer is worn. In two-handle faucets, the hot side has its own valve; replacing just that cartridge typically solves it.
- Yes, for most standard faucets. Look up your faucet brand and model, purchase the matching cartridge at a hardware store, and follow the manufacturer's steps. Specialty or integrated faucets are better left to plumbers.