A dripping bathtub faucet is usually caused by a worn-out washer or O-ring. Here's how to repair a dripping bathtub faucet yourself, saving water and money—a simple fix that most homeowners can handle in under an hour.
Why Fix a Dripping Faucet?
According to the EPA WaterSense program, a faucet leaking at one drip per second can waste more than 3,000 gallons of water each year—enough for 180 showers. That waste also drives up your water bill and, if the leak is hot water, increases your energy costs. Tackling the repair now prevents further damage to the faucet and surrounding fixtures.
At MyTownPlumber, we’ve seen many cases where a simple DIY fix could have avoided a more costly leak detection call later. If you’re dealing with a stubborn drip, follow this guide; if you get stuck, our professional team is ready to help.
Tools and Materials Needed
- Adjustable wrench or basin wrench
- Screwdrivers (Phillips and flathead)
- Replacement washer or O-ring (check your faucet type)
- Cartridge or valve stem (if needed)
- Plumber’s grease (silicone-based)
- Penetrating oil (WD‑40 or similar)
- Clean cloth or rag
- Bucket or towel to catch water
Step-by-Step Instructions
1. Shut Off the Water Supply
Locate the shutoff valves under the sink or, in older homes, the main water shutoff. Turn both hot and cold handles clockwise. Open the faucet briefly to relieve pressure and confirm the water is off.
2. Remove the Faucet Handle
Pry off the decorative cap (if present) using a flathead screwdriver. Unscrew the handle screw and lift the handle off. If it’s stuck, apply penetrating oil and wait a few minutes.
3. Identify the Internal Mechanism
Once the handle is off, you’ll see the cartridge or valve stem. Bathtub faucets come in several designs. Refer to the table below to identify your type and the likely cause of the drip.
| Faucet Type | Common Cause of Drip | Repair Method |
|---|---|---|
| Compression (two handles) | Worn washer or seat | Remove stem, replace rubber washer and seat washer |
| Cartridge (single‑handle) | Broken or deteriorated cartridge | Pull out old cartridge, insert new one |
| Ceramic Disk | Worn seals or debris | Clean disk assembly or replace seals |
| Ball‑Type (single‑handle) | Worn O‑rings or ball | Replace O‑rings and ball |
4. Replace the Worn Part
For a compression faucet, unscrew the stem retaining nut, remove the stem, and replace the washer (use the correct size). Apply a light coat of plumber’s grease before reassembly. For a cartridge faucet, pull out the old cartridge (pliers may help) and press in the new one, making sure it’s aligned. Ceramic‑disk and ball faucets require similar part replacement; consult your manufacturer’s documentation—official guides are available on sites like Energy.gov for water‑saving tips.
5. Reassemble and Test
Replace the handle, tighten the screw, and snap the cap back on. Turn the water supply back on slowly, check for leaks under the handle, and let the faucet run for a minute. If it still drips, the seat may need re‑facing, a job best left to a professional.
Troubleshooting Common Issues
- Drip continues after replacement: The valve seat may be pitted or the wrong washer size was used. Try a seat‑wrench or call a plumber.
- Handle is hard to turn: The cartridge may be misaligned or needs lubrication. Apply plumber’s grease.
- Water flows from the spout when the shower is on: A diverter problem – unrelated to the drip, but can be addressed separately. See our drain cleaning page for related drain issues.
When to Call a Professional
If you’re not comfortable identifying the faucet type, or if the drip persists after replacing the obvious parts, it’s time to bring in an expert. Pipe repair may be needed if the leak has damaged the valve body. Our team at MyTownPlumber handles all faucet repairs, from simple washer swaps to complete valve replacements. We also offer water heater repair and toilet repair services to keep your bathroom running smoothly.
Cost of Repair vs. Replacement
DIY repairs typically cost between $5 and $30 for parts. If you need to call a professional, the typical US range is $100–$400 depending on your location and the faucet complexity (prices vary by region). Replacing the entire faucet can run $150–$600 plus installation. Often, a simple part swap is much cheaper than a full replacement. Check the IAPMO website for industry standards on fixture performance.
Preventing Future Drips
Regular maintenance helps: replace washers every few years, avoid overtightening handles, and install a water‑softener if you have hard water (hard water accelerates wear). The Energy.gov water‑heating guide offers additional tips to improve efficiency. And if you ever suspect a hidden leak, our leak detection service can find it quickly.
Frequently Asked Questions
Q: Can I fix a dripping bathtub faucet without turning off the water?
A: No. Always shut off the water supply before disassembling the faucet, or you’ll cause a flood.
Q: How do I know what type of faucet I have?
A: Look at the handle configuration. Two separate handles usually mean compression; a single‑handle often means cartridge, ball, or ceramic disk. The table above can help you identify yours.
Q: Why does my faucet still drip after I replaced the washer?
A: The valve seat may be worn, or the new washer might be the wrong size. Try a seat‑wrench to smooth the seat, or call a pro.
Q: How much water does a dripping faucet waste per year?
A: According to the EPA, one drip per second wastes over 3,000 gallons annually. That’s enough to fill a small swimming pool.
Q: Can I use petroleum jelly instead of plumber’s grease?
A: It’s not recommended—petroleum jelly can cause rubber parts to swell and fail. Use a silicone‑based plumber’s grease.
Q: When should I replace the entire faucet instead of repairing it?
A: If the faucet is more than 15 years old, or if parts are no longer available, replacement is usually more cost‑effective.
If you’d rather leave this repair to the pros, MyTownPlumber offers fast, reliable service. Contact us today for a quote – click here for our special offer.
By MyTownPlumber Editorial Team