I Fixed a Running Toilet in 20 Minutes
Our guest bathroom toilet had been running — that faint endless hissing — for months. I kept meaning to call a plumber. Then I looked up what was actually involved, and felt silly for waiting.
The diagnosis: take the tank lid off and look. Nine times out of ten, a running toilet is the flapper — the rubber seal at the bottom of the tank. If it's warped, cracked, or doesn't sit flat, water leaks into the bowl nonstop and the tank keeps refilling. Mine looked like a potato chip.
The fix: turn off the water valve behind the toilet, flush to empty the tank, unhook the old flapper (it just clips onto two pegs), clip the new one on, reconnect the chain with a little slack, turn the water back on. A universal flapper costs about $5 at any hardware store.
The whole thing took 20 minutes, and most of that was me being careful on the first try. A plumber would have charged $100+ for a house call.
The honest part: if the flapper looks fine, the next suspect is the fill valve — also replaceable, also cheap, slightly more annoying. And if water is leaking from the base of the toilet onto the floor, that's a wax ring job — stop, call a professional, that's not a 20-minute fix.
A running toilet can waste 200+ gallons a day. That's real money on your water bill, every month, for a $5 part and 20 minutes. Just lift the lid and look.