How to Fix a Dripping Tub Faucet
Continuous tub drip wastes 8 gallons per day. The fix is a $15 cartridge.
TL;DR
Tub faucet drips trace to either the cartridge (handle valve worn) or tub spout diverter. Cartridge replacement is same procedure as shower valve. Spout replacement is $30 and 15 minutes.
What’s in this guide
- Diagnose drip source
- Tools
- Cartridge replacement
- Spout replacement
A continuous drip from your tub spout wastes water and stains the tub over time. The fix depends on where the drip is from.
Tools & Materials You’ll Need
Tools
- Allen wrench set
- Channel-lock pliers
- Cartridge puller (brand-specific)
Materials
- Replacement cartridge ($15-$45) OR replacement spout ($30)
Step-by-Step Instructions
Determine Drip Source
Drip from tub spout while shower running = spout diverter failure. Drip from spout with all valves off = cartridge failure.
Replace Spout (Diverter Issue)
Slip-on spouts: loosen setscrew underneath, slide off. Threaded: unscrew counter-clockwise. Replace with new spout matching length and connection type.
Cartridge Replacement (Handle Drip)
Same procedure as shower valve cartridge. Shut off main water, remove handle and trim, swap cartridge. See shower faucet guide for details.
Test
Restore water. Test through full hot/cold range. Verify no drip from spout when shower is engaged.
Failed spout diverter is the most common shower complaint we hear: “shower works but water still comes out tub.” 95% of the time it’s a $30 spout replacement that takes 15 minutes. Don’t pay $185+ for service call before checking the spout.
Don’t over-tighten new spout
Cracking the wall pipe behind the spout is a major in-wall repair.
Real Scenarios from Our LA Service Calls
Diverter failure mistaken for valve
Customer was quoted $850 for “complete tub valve replacement” by another plumber. Actual issue: $30 spout replacement, 12 minutes. Saved customer $820.
When to Call a Plumber Instead
DIY isn’t always the right call. Bring in a licensed plumber if any of these apply:
- Cartridge won’t come out
- Leak inside wall
- Multiple repairs failed
- Custom tub/shower valves
Frequently Asked Questions
How long does tub cartridge last?
5-8 years SFV. 10-15 years coastal LA.
Why diverter fail?
Internal rubber wears, mineral buildup prevents proper sealing.
Can I just replace whole valve?
Yes but in-wall work, $1,200-2,200. Cartridge replacement at $185-385 is much cheaper.
Why does spout drip after shower?
30-60 second drip is normal residual water. Continuous drip = diverter failure.
Style differences between brands?
Functionally similar. Visually different. Most installs are brand-specific cartridges.
Need professional help in Los Angeles?
Same-day service. Flat-fee pricing. No surprise add-ons.
Call (818) 938-8660
