A toilet that won’t stop running isn’t just annoying — it can waste hundreds of gallons of water a day. Thankfully, this common problem usually has a quick fix that doesn’t require a plumber.
Here’s what causes a running toilet — and how to fix it step by step.
🛠️ Common Causes of a Running Toilet
Most running toilets are caused by one of these three issues inside the tank:
1. Worn Out Flapper
The rubber flapper seals the bottom of the tank. If it’s cracked, dirty, or misaligned, water will keep leaking into the bowl.
2. Float Set Too High
The float controls the water level. If it’s set too high, water spills into the overflow tube — making the toilet run constantly.
3. Chain Problems
If the chain connecting the flush handle to the flapper is too short or tangled, the flapper can’t close properly after flushing.
🧰 What You’ll Need:
- Adjustable wrench (if needed)
- Replacement flapper or fill valve (optional)
- Rubber gloves
- Towel or sponge
🛠️ How to Fix It (Step-by-Step)
✅ Step 1: Remove the Tank Lid
Take off the toilet tank lid and set it aside carefully.
✅ Step 2: Identify the Problem
Flush the toilet and watch what happens. Is the flapper sealing? Is water spilling into the overflow tube?
✅ Step 3: Adjust or Replace the Flapper
If it’s not sealing, clean it or replace it with a universal flapper (under $10 at hardware stores).
✅ Step 4: Lower the Float (if needed)
If water is too high, lower the float by adjusting the screw on the fill valve or sliding the float down the rod.
✅ Step 5: Fix the Chain
Make sure the chain has a little slack — about ½ inch. Too tight or too loose will keep the flapper from working.
🧼 Final Tips:
- Turn off the water supply (under the tank) if you’re doing repairs.
- Test your repair by flushing several times and watching the tank refill.
- Replace the entire fill valve if none of the above works — it’s still an easy DIY job!
💧 Pro Tip: Fixing a running toilet can save you up to 200 gallons of water a day — and lower your utility bill significantly.
👉 Back to Main Guide: 10 Essential Home Repairs Every Homeowner Should Know
