Repair a Dripping Bathtub Faucet in Canton, MA
By Canton 24/7 Plumbing, 2026
A tub faucet that drips after you shut it off is usually one worn part, and which part depends on the faucet type. Two handles with a slow drip from the spout point to a worn washer or seat. A single handle that drips or will not stay off points to a tired cartridge. A drip only after you pull the shower diverter points to the diverter itself.
If you own a Canton, MA house with an older tub, this guide helps you work out which part to replace, what to buy, and the point where the job stops being a weekend repair. Most of the repairs below take under an hour once the water is off.
Match the drip to the part
Look at the faucet before you pick up a tool. The handle count and the way the drip behaves narrow the cause to one or two parts.
| What you see | Likely cause | Usual fix |
|---|---|---|
| Two handles, spout drips from one side | Worn rubber washer or pitted valve seat | New washer and stem screw, or reface the seat |
| Two handles, handle leaks at the base when on | Dried stem packing or O-ring | New O-ring or packing nut tightened |
| One handle, spout drips when off | Worn cartridge or mixing valve seal | Replace the cartridge |
| One handle, hot or cold barely changes the mix | Scaled or stuck cartridge | Clean or replace the cartridge |
| Drips from the spout after the shower is on | Failing diverter | Replace the diverter or the spout |
| Water seeps from the wall around the trim | Failed O-ring or valve body leak | Stop and call a plumber if behind the wall |
First, can you stop the water?
Many tubs have no shutoff valves of their own. If there is an access panel on the other side of the wall, look for stops on the hot and cold lines. If not, you will have to close the main shutoff in the basement or the meter area and open a fixture on the lowest floor to drain the pipes.
Test it before you unscrew anything. Turn the tub handle on and see whether the water stops. If a leaking main shutoff will not hold, or you cannot find it, that is your cue to stop and call a plumber rather than guess.
Hot water in the pipes is a scald risk. If the water heater is running, let a faucet cool the line before you work on the hot side. Plug the drain with a rag so a screw cannot fall in.
Fixing a two-handle compression tub faucet
Work on one side at a time and keep the removed parts in order on a towel.
Pull the handle
Pop off the cap, remove the screw and lift the handle. A stuck handle needs a handle puller, not a pry bar against the tile.
Remove the stem
Unscrew the escutcheon, then use a deep socket or adjustable wrench on the bonnet nut and turn counterclockwise. The stem comes out with the washer on the end.
Replace the washer and O-ring
Take the old washer to the hardware store to match the size and shape, flat or beveled. Replace the stem O-ring while it is out, and coat it with plumber's grease.
Check the seat
Run a fingernail around the brass seat inside the valve. If it is pitted or rough, a new washer will wear out quickly. A seat wrench removes a loose seat, and a seat dresser smooths a fixed one.
Reassemble and test
Snug the bonnet nut, install the handle, open the water slowly and check for weeping at the packing. Leave the stem a little loose if the handle turns hard.
Single-handle tubs: the cartridge route
A single-handle tub valve uses a cartridge that slides in and out of the valve body. The handle comes off first, then the trim plate, then a retaining clip or screw. Pull the cartridge straight out with pliers, or a cartridge puller if it is stuck.
Bring the old cartridge to the store because there are many near-identical ones. The stem splines, the length and the notch pattern must match. A pressure-balancing cartridge guards against sudden scalds, so replace it with the same type.
Coat the new O-rings with silicone-safe or plumber's grease, push the cartridge fully home, and set it so the handle's hot and cold directions line up with the label. A rotated cartridge is the reason many homeowners think the new part is defective.
Fix it or call someone
Cartridge and washer swaps are within reach for many homeowners. The signs below say the job belongs to a pro.
Reasonable to try
- Replacing a washer, O-ring or cartridge from the front
- Swapping a tub spout or diverter
- Cleaning scale off a cartridge with vinegar
- Re-caulking where the spout meets the wall
Stop and call a plumber
- No shutoff and the main will not close
- Corroded valve body that spins or crumbles
- A ceiling stain or wet wall below the tub
- A handle that will not shut off even with the water supply fully stopped
Tools and parts to have before you start
Handle puller
Needed if a handle has fused to its stem over years of heat and soap.
Seat wrench and seat dresser
For a worn seat on a two-handle faucet. The wrench fits a square or hex opening in the seat.
Cartridge puller
A cartridge in a scaled valve rarely slides out by hand.
Allen keys and screwdrivers
Set screws under caps are common. Carry both hex and Phillips sizes.
Plumber's grease and Teflon tape
Grease for O-rings and cartridges, tape only for threaded fittings that need it, like a spout nipple.
The spout and diverter drip
A drip that only starts when you pull the diverter up for the shower may not be in the valve at all. The diverter inside the spout wears, and the spout is a quick swap. Check whether the spout attaches with a set screw under the lip or screws on by threads.
If the spout threads onto a copper nipple, wrap the nipple with Teflon tape before installing the new one. If it slips on with a set screw, no tape is needed. Seal the gap at the wall with a bead of caulk, because water behind the wall will rot the framing.
Why a drip is worth fixing, and when it is urgent
A drip can wait for the weekend. A valve that will not shut off cannot. If handle movement does nothing and water keeps running, close the main and call (617) 752-0573 for dispatch.
Canton, MA: water chemistry, permits and old tubs
Canton does not publish a hardness figure in the 2023 town letter, so ask the Canton Water/Sewer Division for the current number or test your own tap. Scale is what jams a cartridge, so check the old part for white crust. A vinegar soak helps clean it.
The same letter says Canton adjusts pH to reduce lead and copper and treats iron and manganese at its plants. If a stem has turned green or black, replace it rather than cleaning it.
Under 248 CMR 3.05 a permit is not required to repair a leak in a faucet, valve or other working part of a fixture. Cutting into the wall to replace a valve body is a different job. Ask the Canton Building Department about your specific job.
Sources: Canton Water/Sewer Division 2023 water quality letter via MWRA (town utility report), 248 CMR 3.05 as published by Cornell LII (state regulation)
Canton, MA questions on this topic
Do I need a permit in Canton to replace a tub valve behind the wall?
Repairing a faucet, valve or other working fixture part does not need a permit under 248 CMR 3.05. Replacing a valve body means cutting into pipe, and that is plumbing work with its own rules. Ask the Canton Building Department about your specific job before you open the wall.
Where do I shut off the water in a Canton house if the tub has no stops?
Look for the main shutoff where the water line enters the house, often in the basement near the meter. If it will not turn or does not hold, stop there and ask the Canton Water/Sewer Division who handles the shutoff at the street side.
How do I tell whether the leak is in the wall instead of the faucet?
If the spout is dry when the handle is off but a ceiling stain appears below the bathroom, or the wall around the trim is damp, treat it as a leak behind the wall. Shut the water off and call a plumber, or a leak specialist, before cutting anything.
Can I use a plain cartridge instead of a pressure-balance one?
It will fit sometimes, but you lose the scald protection when someone flushes a toilet nearby. Use the exact type that came out of the valve, or ask the store to match it.
Related services and nearby towns
The Dedham-Westwood Water District's 2025 report put its average hardness at 6.0 grains per gallon, which is moderately hard, so scale on cartridges is a fair suspect for homeowners in Westwood. Neighbors in Norwood call the same dispatch line, and our plumbers handle tub faucet repair when the valve is too corroded to rebuild, with a clear price before work starts.
Sources and standards
These are the primary sources this page relies on. Anything not listed here is general plumbing practice, and local rules should be confirmed with the town.
- 248 CMR 3.05, the Massachusetts plumbing and gas fitting regulation, as published by Cornell LII
- Town of Canton Building Department, online permitting page (plumbing and gas permits)
- Canton Water/Sewer Division 2023 water quality letter, distributed through the MWRA community page
Plumbing problem in Canton right now?
Call the 24/7 line. You hear a clear price before work starts.
Call (617) 752-0573