Monrovia Plumbing Company handles residential and commercial plumbing throughout Monrovia and the surrounding Los Angeles County area. Whether you have a clogged drain, a water heater that stopped working, a slab leak under a concrete foundation, or pipes that have seen better days, we take the call and get to work. We handle everything from routine faucet repairs to full repiping jobs, and we serve single-family homes, multi-unit buildings, restaurants, and commercial properties alike. We are open seven days a week, 7:00 AM to 9:00 PM. Local work. Sound pipes. Costs set out on the call.
Call (626) 619-9789 for a quote.
A dripping faucet and a full repipe are two different jobs, but both start the same way: a call, a clear scope, and a price before anything is scheduled. Here is what we handle day to day.
A slow drain or a full blockage can stop a kitchen or bathroom in its tracks. We clear clogs in sinks, tubs, toilets, and floor drains, and we can run the main line when a backup affects the whole house. For stubborn buildup or recurring clogs, hydro jetting uses high-pressure water to clear the line without chemicals. The goal is not just to open the drain but to understand why it blocked in the first place.
A leak that is not visible is often the most damaging kind. We use pressure testing to find the source before opening walls or cutting into floors. Once we know where the problem is, we repair or replace the affected section. Slab leaks get their own section below, but any leak in a supply or drain line gets the same approach: the cause found before anything is replaced.
A running toilet, a dripping faucet, or a shower valve that no longer holds temperature are all jobs we handle. We repair and replace faucets, toilets, shower valves, and outdoor hose bibs. If you are updating fixtures in a kitchen or bathroom, we handle the installation from the supply connection to the drain. We'll handle the pipes so you don't have to.
No hot water is one of the most disruptive plumbing problems in any home or building. We diagnose tank water heaters, repair what can be repaired, and replace units that have reached the end of their service life. For properties ready to move away from a tank setup, we install tankless water heaters as well. That work is covered in more detail in the regional section below.
A sewer backup or main line clog affects every drain in the building at once. We clear main line blockages, repair damaged sewer lines, and replace sections that are past the point of repair. Trenchless methods are available where the situation allows, which can reduce the amount of digging involved. Our scope covers the line from the house out to the city connection.
A garbage disposal that hums but does not spin, or one that has stopped responding entirely, is a straightforward repair or replacement. Low water pressure throughout a property often points to a failing pressure-regulating valve, mineral buildup, or a supply line issue. We diagnose the cause and fix it at the source. Shutoff valve replacement, whether at a fixture or the main, is also part of what we do.
Older pipe materials eventually reach a point where spot repairs stop making sense. Galvanized steel corrodes from the inside out, reducing flow and contaminating water. Aging copper develops pinhole leaks that repeat in different locations. When that pattern starts, repiping the affected sections or the whole house with PEX is often the more practical answer. We scope the job on the call so you know what is involved before work starts.
Call (626) 619-9789 for a plumbing quote.
Plumbing problems don't wait, and neither do we, whether the call comes from a homeowner dealing with a kitchen leak or a property manager coordinating repairs across a multi-unit building.
For homeowners in Monrovia, that often means older housing stock with aging supply lines, galvanized pipes, or fixtures that have been in place for decades. We handle the full range of bathroom and kitchen plumbing, from a single dripping faucet to a bathroom renovation rough-in.
A building with twenty units leaks differently from a house, and we understand what commercial and multi-unit clients need. For landlords, property managers, office buildings, restaurants, retail spaces, and condo associations, we keep plumbing visits scheduled without the runaround. The job is scoped and priced on the call before anything is scheduled, so the visit covers exactly what was agreed.
Hard or soft, the water in this area affects how pipes and fixtures age. That is true for a single-family home in a residential neighborhood and for a commercial kitchen running at full volume. We bring the same approach to both: understand the system, find the problem, fix it right. Give us a call and we will take it from there.
Southern California's housing stock, water supply, and construction methods create a specific set of plumbing demands. Post-war tract homes across the San Gabriel Valley were built on slab-on-grade foundations with copper supply lines cast directly into the concrete. Water across most of Los Angeles County runs moderately to very hard, which accelerates mineral buildup in pipes, fixtures, and water heaters. Older neighborhoods in Monrovia carry infrastructure that was installed generations ago and has not always been updated. These are the jobs we see most often here.
Slab leaks are the signature plumbing problem in this part of Los Angeles County. When copper supply lines are embedded in concrete, they corrode over time from the outside in, and a pinhole leak under a slab can go unnoticed until water bills spike, floors feel warm in unexpected spots, or damp patches appear on carpet or flooring. We locate slab leaks using pressure testing and electronic detection, which means we know exactly where to work before any concrete is touched. Depending on the location and the condition of the rest of the line, we can repair the affected section, reroute the line overhead, or recommend repiping if leaks have started repeating.
Most homes in Monrovia heat water with natural gas, which makes a tankless water heater a straightforward upgrade. A tankless unit heats water on demand rather than keeping a tank warm around the clock, which reduces energy use and frees up space in a utility room or garage. Installation involves sizing the unit to the property's demand, connecting the gas line, and running the appropriate venting. We also service and repair existing tankless units when they develop ignition issues, scale buildup, or flow sensor problems. We'll get your water flowing again fast.
Older homes in Monrovia were often built with galvanized steel supply lines, and many have copper systems that have been in place long enough to develop chronic problems. Discolored water at the faucet, pressure that has gradually dropped, and leaks that keep appearing in different locations are all signs that the pipe itself is the problem, not just the most recent break. We repipe with PEX, which resists corrosion and handles the pressure demands of a full household. The process involves replacing the supply lines throughout the home, and we scope the work in detail before anything starts so you know what the job covers. Honest recommendations on repairs, never an upsell.
Let us handle the plumbing and the permits.
The sooner you call, the sooner the water is back on, and we make that call as straightforward as possible. When you reach us, we ask about the problem, scope what the job is likely to involve, and confirm the rate before anything is scheduled. You know what you are getting into before we arrive.
We are open seven days a week, 7:00 AM to 9:00 PM, including weekends. For urgent situations, including a burst supply line, a sewer backup, or a water heater that has stopped working entirely, we take short-notice calls and work to get to you as quickly as the schedule allows.
Plumbing visits are scheduled without the runaround. Call in the morning. Describe the leak. Hear what the fix involves.
We serve Monrovia as our home base and take calls throughout the surrounding communities in Los Angeles County. If your property is in Arcadia, Duarte, Azusa, Bradbury, Temple City, El Monte, Baldwin Park, or Irwindale, we cover it. The San Gabriel Valley broadly is part of our regular service area, and we handle both residential and commercial calls across the region.
We use pressure testing to isolate which line is losing pressure, then electronic leak detection to pinpoint the location within the slab. That combination lets us identify exactly where to work before any concrete is touched. Once the location is confirmed, we scope the repair, which may involve targeted access, rerouting the line above the slab, or repiping if leaks have been recurring.
The clearest indicators are leaks that keep appearing in different locations, water pressure that has declined gradually over years, or discolored water at the faucet. Galvanized steel pipes corrode from the inside out, and once that process is advanced enough, the next leak is rarely the last one. We scope the existing system before recommending a repipe and walk through the material options, typically PEX or copper, based on the property and its water chemistry.
The visit starts with pressure testing and electronic detection to locate the leak precisely. From there, the repair is scoped: depending on the location and the condition of the surrounding pipe, we may open a targeted section of concrete, reroute the line overhead, or recommend addressing the full supply system if the pipe material is the underlying problem. The scope and the price are confirmed before any concrete work begins.
Installation involves sizing the unit to the property's demand, confirming the gas supply line is adequate for the new unit's requirements, connecting the water lines, and running the appropriate venting. For a straightforward residential replacement, the work is typically completed in a single visit. We scope the gas line and venting situation on the call.
After the repair or installation is complete, we run water through the affected lines, check connections for leaks, and confirm that pressure and flow are correct at the relevant fixtures. For a water heater replacement, we verify that the unit is heating and that the pressure relief valve is functioning. For drain work, we run water to confirm the line is clear and draining at the right rate.
Tree roots enter sewer lines through joints and cracks, then grow inside the pipe until they restrict or block flow entirely. In older neighborhoods in Monrovia and the surrounding area, clay or cast-iron sewer laterals are particularly vulnerable because their joints are less tight than modern pipe. Grease and mineral buildup contribute separately, narrowing the line over time until a backup forces the issue.
If only one drain is slow or blocked, the clog is usually in the branch line serving that fixture. When multiple drains back up at the same time, or sewage is returning through a floor drain or low fixture, the problem is almost always in the main sewer line. We diagnose which is the case before recommending a fix, because the approach and the scope are different for each.
Whole-house low pressure usually points to a failing pressure-regulating valve, a partially closed main shutoff, or supply lines that have narrowed from mineral buildup or corrosion. In older Monrovia homes with galvanized pipe, the interior corrosion alone can reduce flow significantly over time. We test and diagnose the cause before recommending a fix, because the right repair depends on where in the system the restriction is.
A camera inspection runs a small camera through the sewer line to show the condition of the pipe, the location of any blockage, and whether there is root intrusion, joint separation, or pipe damage. It is most useful when a backup has cleared but keeps returning, when a main line repair is being scoped, or when a property is changing hands and the sewer condition is unknown. The camera gives us a clear picture of what is happening before committing to a repair approach.
Discolored water at the faucet, a metallic taste, visible rust at exposed fittings, leaks that appear in multiple locations over a short period, and pressure that has gradually declined are all signs that the pipe material itself is the problem. In Monrovia's older housing stock, galvanized steel and aging copper are both common materials that reach this point. When the pattern points to the pipe rather than an isolated fitting, repiping is usually the more practical answer.
A water heater that is failing often produces sediment that moves into supply lines and fixtures, contributing to buildup at aerators and valves. Inconsistent temperature can signal a failing thermostat or heating element, but it can also mean sediment has insulated the heating element enough to reduce efficiency. Addressing the water heater before it fails entirely prevents that sediment from spreading further into the system.
Older shutoff valves, particularly gate valves, are prone to failing when they are actually needed, either seizing open or leaking when turned. We replace them with ball valves, which are more reliable and easier to operate. Supply lines under sinks and behind toilets are checked at the same time, since braided or corroded lines in an older home are a common source of slow leaks.
A repair that addresses the symptom without finding the cause usually means the same problem returns, often in a slightly different location or a more disruptive way. In older homes, a patch on a corroded pipe delays the conversation about the pipe material rather than resolving it. We scope the job to find the actual cause, which takes a bit more time on the front end and generally avoids a second call for the same underlying problem.
From a dripping faucet to a full repipe, from a single-family home to a multi-unit building, Monrovia Plumbing Company handles the full range of residential and commercial plumbing in Monrovia and the surrounding Los Angeles County area.
Call (626) 619-9789 for a quote.
We are open seven days a week, 7:00 AM to 9:00 PM.
Below is a quick look at the plumbing work we handle in Monrovia and the surrounding San Gabriel Valley. Each service is scoped and priced on the call before anything is scheduled, so you know what the visit covers before we arrive. Whether the job is a single dripping faucet or a full repipe, the process starts the same way. Call us and we will walk through it with you.
| Service | What's Included | Typical Situations | Good to Know |
|---|---|---|---|
| Faucet & Fixture Installation | Faucet repair and replacement, Shower valve service, Outdoor hose bib replacement | Kitchen or bathroom updates, dripping fixtures, or valves that no longer hold temperature | We handle the supply connection and the drain so the installation is complete from start to finish. |
| Hot-Water Recirculation Pumps | Recirculation pump installation, Timer and sensor setup, Connection to existing water heater | Homes where hot water takes a long time to reach fixtures at the far end of the supply line | A recirculation pump keeps hot water moving through the line so it arrives at the faucet faster without running the water to warm it up. |
| Drain Cleaning & Clog Removal | Sink, tub, and toilet clogs, Main line clearing, Hydro jetting for stubborn buildup | Slow or fully clogged drain in kitchens, bathrooms, or the whole house | Recurring clogs in the same drain often point to a buildup or root issue deeper in the line, not just at the fixture. |
| Garbage Disposal Service | Disposal repair for humming or unresponsive units, Full unit replacement, Drain connection check | A disposal that has stopped spinning, leaks at the base, or no longer responds | Most disposal problems are resolved in a single visit, either a repair or a direct replacement depending on the unit's condition. |
| Earthquake Gas Shutoff Valves | Automatic shutoff valve installation on gas supply lines, Existing valve inspection | Homeowners in seismically active areas who want the gas supply to shut off automatically after a significant event | Installation is on the gas line that feeds the home. We do not service the appliances connected to that line. |
| Sewer & Main Line Service | Main line clog clearing, Sewer line repair and replacement, Trenchless options where applicable | Multiple drains backing up at once or recurring sewer odors in the home | Our scope covers the line from the house out to the city connection, not the tank or drain field beyond it. |
| Leak Detection & Repair | Pressure testing to locate hidden leaks, Supply and drain line repair, Slab leak detection and repair | Any leak that is not visible or has caused unexplained water bill increases | Finding the source before opening walls or floors saves time and avoids unnecessary damage to finished surfaces. |
| Slab Leak Detection & Repair | Pressure testing and electronic detection, Targeted concrete access, Line rerouting or repiping where needed | Homes on slab foundations with unexplained wet floors, warm spots, or rising water bills | Post-war tract homes across the San Gabriel Valley commonly have copper supply lines cast into the slab, making this one of the most frequent calls we take in Monrovia. |
| Emergency Plumbing | Burst supply line response, Sewer backup response, Water heater failure response | Any situation where water is actively causing damage or the home has lost hot water entirely | We take short-notice calls and work to get to you as quickly as the schedule allows. We are open every day, 7:00 AM to 9:00 PM. |
| Whole-Home Repiping | Galvanized or aging copper replacement, PEX supply line installation, Full system scope before work starts | Older homes with discolored water, declining pressure, or leaks appearing in multiple locations | Galvanized steel corrodes from the inside out, reducing flow and contaminating water. When leaks keep repeating, the pipe material is usually the problem. |
| Toilet Repair & Installation | Running toilet repair, Full toilet replacement, Flange and wax ring service | A toilet that runs constantly, leaks at the base, or needs to be replaced entirely | A running toilet can waste a significant amount of water before the problem becomes obvious on a bill. |
| Water Heater Repair & ReplacementMost Popular | Tank water heater diagnosis and repair, Full unit replacement, Tankless water heater installation and service | Homes or buildings with no hot water, inconsistent temperature, or a unit past its service life | A tankless unit heats water on demand and frees up space in a utility room or garage, a common upgrade in Monrovia homes already on natural gas. |
| Water Pressure & Shutoff Valve Repair | Pressure-regulating valve diagnosis and replacement, Main and fixture shutoff valve replacement, Supply line inspection | Whole-house low pressure or shutoff valves that have seized or are leaking | Older gate valves often fail when they are actually needed. Replacing them with ball valves is a straightforward improvement. |
What are the signs that a water heater needs to be replaced rather than repaired?
Age is the first factor. A tank unit that is well past its expected service life and developing new problems is usually a better candidate for replacement than repair. Beyond age, signs include rust-colored water at the hot faucet, a rumbling or popping sound from the tank as sediment builds up, visible corrosion around the base or connections, and water pooling underneath the unit. A failing heating element or thermostat can often be repaired, but when the tank itself is corroding, repair does not extend the unit's life in any meaningful way. We diagnose the unit on the call and walk through what the repair involves versus what a replacement would cost, so you can make an informed decision.
What is hydro jetting and when does it make sense over snaking a drain?
Snaking a drain uses a cable to break through or pull out a blockage, which clears the immediate clog but leaves buildup on the pipe walls. Hydro jetting sends a high-pressure stream of water through the line, which clears the blockage and scrubs the interior of the pipe at the same time. It is more thorough and is particularly useful for grease buildup in kitchen lines or mineral scale in older pipes. We recommend it when a drain keeps clogging after repeated snaking, or when a camera shows significant buildup lining the pipe rather than a single obstruction.
Do I need to be home for the plumbing visit?
For most work, yes. The person on site needs access to the affected area, and in many cases we will need to locate the main shutoff or access points in areas like a garage, crawl space, or utility room. For rental properties, a property manager or designated contact can meet us on site in place of the owner. We confirm the access requirements on the call so the visit can start without delay.
Cause Found Before Anything Is Replaced
We locate the source of the problem before recommending a repair. Pressure testing, electronic detection, and a thorough look at the affected system come first, so the fix addresses what is actually wrong.
How does pricing work and when do I find out what the job will cost?
We scope the job on the call based on what you describe, and we confirm the rate before anything is scheduled. The job is priced before a wrench comes out, so you know what the visit covers before we arrive. If we get on site and find something that changes the scope, we walk you through it before proceeding. You are not committed to work you have not agreed to.
When does it make sense to call a plumber rather than try a DIY fix?
A plunger or a hand-crank drain snake is a reasonable first step for a simple sink or toilet clog. Beyond that, most plumbing work involves shutting off water supply, cutting pipe, or working with gas lines, and a mistake can cause more damage than the original problem. If the clog is recurring, the leak is behind a wall or under a slab, the water heater is not producing hot water, or the issue involves the main shutoff or sewer line, calling us is the faster and usually less expensive path.
How are emergency plumbing calls handled?
We take short-notice calls every day from 7:00 AM to 9:00 PM. When you call, describe what is happening and we will scope the situation and confirm what we can do. For an active leak or a sewer backup, the first step is usually locating and closing the nearest shutoff to stop the damage while the repair is arranged. We work to get to urgent situations as quickly as the schedule allows and confirm what the visit covers before we arrive.
Scope Agreed Before Any Pipe Is Cut
The job is priced and scoped before work begins. You know what the visit covers and what it costs before we touch anything.
Why does a faucet or fixture drip even after the cartridge or washer has been replaced?
A drip that returns after a cartridge or washer replacement usually means the seat or the valve body itself is worn or corroded. In older fixtures, the valve body can develop pitting that prevents a new cartridge from sealing properly. Hard water accelerates that process by leaving mineral deposits on seating surfaces. In those cases, replacing the entire faucet is more reliable than repeated cartridge swaps. We check the valve body and the water supply line at the same time so the repair addresses the actual cause.
How long does a whole-home repipe typically take?
The timeline depends on the size of the home, the number of fixtures, and how the existing pipes are routed. A single-story home can often be repiped in one to two days. A larger or multi-story property may take longer. We scope the job in detail before work starts, which includes walking through the access points, the number of fixtures involved, and the expected duration. Water is shut off during the work and restored at the end of each day where possible.
Older and Newer Plumbing Both Handled
Monrovia's housing stock runs from post-war slab homes with galvanized or embedded copper lines to newer construction with PEX and tankless water heaters. We work on both without steering you toward unnecessary upgrades.
What causes a running toilet and how is it fixed?
A toilet that runs continuously is almost always a problem with the fill valve, the flapper, or both. The flapper seals the opening between the tank and the bowl. When it wears or warps, water passes through constantly and the fill valve runs to compensate. A worn fill valve can also fail to shut off properly on its own. Both are straightforward repairs in most cases. If the toilet is older and both components need replacement, we sometimes recommend replacing the entire unit, particularly if the flush mechanism has other wear.
What is a pressure-regulating valve and how do I know if mine needs attention?
A pressure-regulating valve, sometimes called a PRV, sits on the main water supply line where it enters the home and reduces the incoming street pressure to a level that is safe for household fixtures and appliances. When a PRV starts to fail, pressure throughout the home can drop gradually or fluctuate, and in some cases it can allow pressure to climb higher than it should. Signs include pressure that has gotten noticeably lower over time, banging pipes, or fixtures that seem to be working harder than they used to. We test the incoming and outgoing pressure and replace the valve if it is no longer regulating correctly.
What is involved in installing an earthquake gas shutoff valve?
An automatic earthquake gas shutoff valve is installed on the gas supply line where it enters the home. When a seismic event exceeds a set threshold, the valve closes automatically to stop gas flow. Installation involves cutting into the existing gas line, fitting the valve, and confirming that all downstream appliances relight correctly afterward. The work is on the gas line itself. We do not service the appliances connected to that line.
Call (626) 619-9789 to describe your situation and hear what the fix involves before anything is scheduled.
(626) 619-9789