Toilet Leaking at the Base? How to Fix It
A toilet leaking at the base is usually caused by a failed wax ring ($5-$10 for the ring, $150-$300 for professional replacement). Turn off the water, flush to empty the tank, disconnect the supply line, remove the bolts, lift the toilet, scrape off the old wax ring, install a new one, and reset the toilet. If the flange is broken, that costs $150-$400 extra to repair.
Cost Breakdown
| Service | Low | High | Notes |
|---|---|---|---|
| Wax ring (DIY) | $5 | $10 | 15-30 minute job |
| Wax-free ring (DIY) | $10 | $20 | Reusable, easier to install |
| Professional wax ring replacement | $150 | $300 | Labor + parts |
| Flange extender (DIY) | $10 | $20 | For low flanges |
| Flange repair ring | $15 | $30 | For cracked flanges |
| Professional flange repair | $150 | $400 | Severe damage |
Fixing a Toilet That Leaks at the Base
Why It Happens
The wax ring between the toilet and the floor flange creates a watertight seal. Over time (10-30 years), the wax can dry out, compress, or shift, breaking the seal. Every flush sends a small amount of water under the toilet base.
DIY Fix: Replace the Wax Ring
- Turn off the water at the shut-off valve behind the toilet
- Flush the toilet and hold the handle to drain as much water as possible. Sponge or wet-vac the remaining water from the tank and bowl.
- Disconnect the water supply line from the bottom of the tank
- Remove the bolt caps and nuts at the base of the toilet (one on each side). If they are rusted, use a hacksaw to cut them.
- Lift the toilet straight up and set it on a towel or old blanket. Toilets weigh 50-80 lbs.
- Scrape off the old wax ring from both the flange and the bottom of the toilet. Use a putty knife.
- Inspect the flange. It should be level with or slightly above the floor. If cracked or broken, repair before proceeding.
- Press the new wax ring onto the toilet outlet (warm it in your hands first for better adhesion)
- Lower the toilet straight down onto the flange bolts. Press down firmly with your weight. Do NOT twist or rock — this can break the seal.
- Tighten the nuts alternately, a little at a time. Do NOT overtighten — porcelain cracks easily.
- Reconnect the supply line and turn on the water. Flush several times and check for leaks.
When the Flange Is the Problem
If the flange is cracked, corroded, or sitting below the floor level (common after new flooring is installed), the wax ring cannot seal properly. Flange repair options:
- Flange extender ($10-$20): Raises a low flange to proper height
- Flange repair ring ($15-$30): Bolts over a cracked flange
- Full flange replacement ($150-$400 professional): For severely damaged flanges
Related Questions
Can I use the toilet while the base is leaking?
You can, but should not. Each flush pushes sewage water onto your floor and potentially through to the subfloor, causing rot, mold, and structural damage. Fix it as soon as possible.
How long does a wax ring last?
Wax rings last 20-30 years on average. They can fail earlier if the toilet rocks or shifts (tighten bolts), if the flange is at the wrong height, or if the toilet was improperly installed.
Is a wax or wax-free ring better?
Wax-free (rubber gasket) rings are easier to install, reusable, and more forgiving of slight misalignment. Wax rings are cheaper and have a longer track record. Both seal effectively when installed correctly.