What it means
The flapper covers the flush valve seat at the tank bottom. When the handle lifts the chain, water rushes into the bowl; the flapper should reseat as the tank refills.
Warped or scaled flappers leak slowly, triggering the fill valve to cycle. Replacement is inexpensive compared with the water waste from an ignored run.
Why it matters in Santa Cruz County
Hard water in Santa Cruz Mountains wells stiffens flappers faster than soft coastal supply. Rental turnovers in downtown Santa Cruz often reveal flapper leaks discovered only after a high utility bill.
Homeowner tip
Add a few drops of food coloring to the tank; color in the bowl without flushing means the flapper is leaking.
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Also explore the Septic Glossary or call 831.225.4344 with questions about your property.