How to Toilet Inspection
Toilets are often neglected until something goes obviously wrong—but silent problems can waste thousands of gallons of water and cause invisible damage beneath the floor. This inspection checks for running toilets that waste water constantly, flapper leaks that silently drain your tank, and wax ring failures that let water seep into the subfloor with every flush. A running toilet can waste 200 gallons per day, adding over $100 monthly to your water bill. Worse, a failing wax ring causes hidden rot that can eventually make your floor unsafe.
Cost to Skip This Task
Risk $200 – $5,000 in repairs
Why It Matters
A running toilet can waste 200+ gallons per day—adding $100+/month to your water bill. A leaking wax ring can cause subfloor rot invisible until the floor gives way. Check twice yearly. A toilet that occasionally "phantom flushes" (refills without being used) has a flapper leak. If the floor around the toilet base feels soft or spongy, the wax ring may have been leaking for some time. Flappers are a $5 fix—don't let them become a $5000 floor repair.
Safety First
- Shut off the water supply valve before working on toilet internals
- Wear gloves when checking around the base
What You'll Need
Supplies
- Food coloring (for leak test)$2
- Replacement flapper (if needed)$8
Step-by-Step Instructions
Before You Start
Check each toilet one at a time. Listen for running water when nobody has flushed recently.
- 1
Listen for running water or periodic cycling (indicates a flapper leak)
- 2
Add a few drops of food coloring to the tank - wait 15 minutes
If color appears in the bowl without flushing, the flapper is leaking
- 3
Check around the base for water or staining (indicates a wax ring leak)
- 4
Try to rock the toilet gently - it should not move
A rocking toilet will eventually break the wax seal and leak
How to Verify Success
No running water sounds between flushes. Food coloring stays in the tank. Base is dry and toilet is stable. Supply line is dry.
When to Call a Professional
- Toilet rocks on the floor (wax ring and flange repair $150-300)
- Water is leaking from the base when flushed (wax ring replacement $100-200, subfloor repair $300-1500 if damaged)
- Toilet is cracked (toilet replacement $200-500 installed)
- Persistent running that a new flapper does not fix (fill valve replacement $100-200)
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