What faucet and sink repair is, and why Monrovia sees it
Faucet and sink repair covers the leaks, drips, and flow problems that show up at kitchen and bath fixtures, plus the drain and supply connections underneath. Most are small jobs, but they are the ones homeowners notice every day, and the wasted water from a steady drip adds up on a metered bill.
Monrovia's very hard water shapes a lot of this work. The high mineral content clogs aerators and showerheads, crusts up cartridges and valves, and leaves faucets feeling stiff or running weak. A faucet that has slowly lost pressure is very often a scaled aerator or supply screen rather than a plumbing problem deeper in the wall.
Heritage homes bring their own challenge: original or vintage fixtures that are part of the home's character. In Old Town and the older neighborhoods, we see faucets and valves that are no longer made, and the goal is to repair and preserve them where we can rather than rip out a fixture that suits the house. When a part is truly gone, we help find a sympathetic match.
Under the sink, the usual suspects are a leaking P-trap, a worn supply line, or a loose connection, all quick fixes that prevent the slow cabinet damage a hidden drip causes. We check the whole assembly, not just the part that is dripping today.
Kitchen sinks bring extra parts into the picture: the pull-out sprayer and its hose, the basket strainer, the air gap for the dishwasher, and the shutoff valves at the wall. Any one of them can be the real source of a leak that looks at first like it is coming from the faucet itself. We check the whole assembly rather than stopping at the first damp spot, so the repair solves the actual problem instead of quietly moving it to the next weakest connection under the cabinet. It is the difference between a fix that lasts and one you call us back about.
Common faucet and sink issues
The symptom usually points straight to the part. We confirm it before quoting.
Dripping or leaking faucet
A drip at the spout is typically a worn cartridge, washer, or O-ring inside the faucet. Hard water wears these faster here, and replacing the right one stops the drip and the wasted water.
Low or sputtering water pressure
Weak flow at one faucet is most often a scaled aerator or a clogged supply screen from Monrovia's hard water. We clean or replace it, and check the supply valves if the problem runs deeper.
Leaks under the sink
Water in the cabinet usually traces to the P-trap, the supply lines, or a loose drain connection. We find the exact source and tighten or replace it before it damages the cabinet.
Repairs we make
The fix matches the fixture, with extra care for the older pieces heritage homes have.
Faucet internals and aerators
We rebuild or replace cartridges, washers, and O-rings to stop drips, and clear or swap scaled aerators and screens to restore pressure. These are the most common faucet repairs in this hard-water area.
Drain, P-trap, and supply repair
We fix under-sink leaks at the trap, the supply lines, and the drain connections, replacing worn parts and resealing connections so the cabinet stays dry.
Heritage fixture care and replacement
For vintage faucets worth keeping, we repair them where parts allow. When a fixture is beyond saving, we install a new one and, on heritage homes, help choose a style that fits the house.
Signs your faucet or sink needs work
These small problems are worth catching early:
- A faucet that drips after you shut it off
- Weak or sputtering flow at one fixture
- A puddle or dampness inside the sink cabinet
- A handle that is stiff or hard to turn
- Crusty mineral scale building on the spout or aerator
Cost of faucet and sink repair in Monrovia and the west SGV
Faucet and sink repairs are small, predictable jobs. A repair is inexpensive. A full faucet replacement costs a bit more depending on the fixture.
Typical price ranges (2026)
| Job | Typical range | Notes |
|---|---|---|
| Faucet repair (cartridge, washer) | $100 – $300 | Drips and handle issues |
| Aerator and supply line service | $80 – $200 | Low pressure, small leaks |
| P-trap and drain repair | $120 – $350 | Under-sink leaks |
| Faucet replacement | $150 – $450 | New fixture installed |
Ranges are typical for the west San Gabriel Valley in 2026 and shift with access, materials, and the age of your home. We quote a firm price after seeing the job, and the estimate is free.
Other plumbing work we handle
A faucet that keeps scaling and a showerhead that keeps clogging are really symptoms of the city's hard water, so we will mention whether a softener would solve the root cause across the whole house. For a bigger update, we also handle garbage disposals, toilets, and full bathroom remodels.
Frequently asked questions
Why does my faucet drip even when it is off?
A drip at the spout is a worn cartridge, washer, or O-ring inside the faucet, worn faster by Monrovia's hard water. Replacing the right internal part stops the drip and the steady waste of water.
Why is the water pressure low at just one faucet?
Low flow at a single fixture is usually a scaled aerator or a clogged supply screen, both caused by hard-water minerals. Cleaning or replacing it typically restores full pressure without deeper work.
Can you repair an old or vintage faucet?
Often, yes. We repair and preserve heritage fixtures where parts allow, since they suit the older homes. When a fixture is truly beyond saving, we help choose a replacement that fits the home's character.
There is water under my sink. Is that serious?
It is worth fixing promptly. Under-sink leaks at the P-trap or supply lines are usually quick repairs, but left alone they quietly rot the cabinet and the floor beneath it.
Will a water softener help my faucets last longer?
Yes. Since the scale that clogs aerators and wears cartridges comes from the city's hard water, a softener addresses the root cause across every fixture, not just the one being repaired today.
Can you install a faucet I bought myself?
We are glad to install a fixture you have chosen, check the supply connections, and make sure it seals and flows correctly, so a new faucet does not start a new leak underneath.
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From the blog
More Monrovia plumbing guides, with real 2026 cost ranges and honest repair-or-replace help, are waiting on our Monrovia plumbing blog.
Faucet dripping or sink leaking?
Call and we will fix the drip, restore the pressure, or install a new fixture, heritage pieces included.