The fifteen-minute test
Take the tank lid off and put a few drops of food colouring in the tank water. Do not flush. After fifteen minutes, look in the bowl: colour there means water is passing the flapper — the rubber seal at the bottom of the tank — into the bowl. The EPA's WaterSense program says most toilet leaks are exactly this, and describes the flapper as an inexpensive rubber, plastic or silicone part. No colour, but the tank refills on its own now and then, and the problem is the fill valve or the float set too high, letting water spill into the overflow tube.
Manatee County's hard water, up to 16 grains per gallon, is why flappers here fail sooner: mineral crust on the flush-valve seat stops the flapper sealing flat. Wiping the seat with a cloth sometimes buys a year; replacing the flapper is the fix.
Do it yourself, or call
A flapper is a homeowner part: shut the supply valve, flush to empty the tank, unhook the old flapper and chain, hook on the new one, set the chain with a little slack. A fill valve is a homeowner part for the confident: it involves disconnecting the supply line under the tank, and a cracked plastic nut or a corroded line — common on older Manatee County toilets — is where a ten-dollar job turns into a wet floor.
Rosco Plumbing does either for $100–$175, and it is the right call when the shutoff valve under the toilet will not turn (do not force a corroded valve), the flush-valve seat is pitted so no flapper will seal, the tank bolts are rusted, or the toilet is old enough that the parts are odd sizes.
When to replace instead
A toilet from before 1994 uses 3.5 gallons a flush or more; the EPA notes today's WaterSense models use 1.28 gallons or less, twenty percent under the 1.6-gallon federal standard, with equal or better performance. A running toilet on a 3.5-gallon unit wastes water twice. If the porcelain is cracked, the seat is pitted, or the toilet has needed two repairs, $250–$500 installed for a new comfort-height model — the standard choice in the 55+ communities — is the better spend.
When to stop and call a licensed plumber
- The shutoff valve under the toilet will not turn or drips when touched.
- A new flapper still leaks — the seat is pitted or the flush valve needs replacing.
- The toilet rocks, the base is wet, or water appears on the floor after a flush — that is the wax ring, not the tank.
- The toilet is from before 1994, has needed two repairs, or you want a comfort-height replacement priced.
Rosco Plumbing's 2026 planning ranges in Bradenton are $100–$175 for a toilet repair and $250–$500 for a toilet replacement installed.
Call (941) 345-2464 or request a free estimate. Residential service in Manatee County; ranges are planning figures, not quotes.
Have Rosco Plumbing contact you about this
Describe what you are seeing and Ross will call or text back with what it sounds like and what the visit costs — no obligation.
What changes in Manatee County
Running toilets are the quiet water bill in Manatee County's seasonal homes: a flapper that started leaking in May runs all summer unseen, and the county bills sewer on water used, so it is charged twice. Del Webb, Cresswind and Esplanade homes from 2015 on have builder-grade fill valves and flappers that scale up in hard water within a few years; the older Bradenton and Palmetto homes have the corroded shutoff valves that make the job a plumber's. Comfort-height replacement is the most requested toilet job in the 55+ communities.