Homeowners across Ontario call for the same range of problems: a drain that stopped clearing, a water heater that quit overnight, a slab leak that showed up as a wet patch on the floor before anything else. We handle all of it, from a single fixture swap to a full supply-line replacement, for residential and commercial properties throughout the city. Property managers with apartment buildings and landlords turning over rental units make up a good portion of our work here too, and the jobs those calls bring are different from a single-family repair in ways that matter: tenant scheduling, multiple affected units, and plumbing systems that see heavier daily use.
For businesses, the picture shifts again. A restaurant with a grease-loaded kitchen drain, a retail space adding a restroom, or a commercial building coordinating fixture installation across several suites all need plumbing work handled on a schedule that does not shut them down. We take those calls alongside the residential ones.
Call (626) 619-9789 to get a quote, and we will scope what the job involves before anything is scheduled.
The rate for a plumbing job is set by what the fault turns out to be and what has to come apart to reach it. A slow drain in a single bathroom and a slow drain caused by a partially collapsed sewer line are both drain problems. They are not the same job, and they do not carry the same price. That difference gets worked out on the call and confirmed before a visit is scheduled.
What moves a quote is straightforward: access to the pipe, the condition of the surrounding material once we get there, whether a permit is required, and whether the repair turns out to be a patch or a replacement. We do not invent a number before we understand the situation. When you call, describe what you are seeing, and we will walk through what the job is likely to involve and what that costs.
The price is confirmed before the visit is scheduled, and the scope is explained before a wrench comes out. If the situation on site turns out to be different from what was described on the call, we talk through that before any additional work begins.
We are open every day from 7:00 AM to 9:00 PM, including weekends, and we take short-notice calls when a problem will not wait. A burst supply line, a sewer backup, or a water heater that has stopped working entirely are not jobs to schedule for next week. Call and describe what is happening, and we will work out what the schedule allows.
For tenants and businesses that need to stay operational, we work around what the property requires. That might mean coordinating access with a tenant, staging work across more than one visit, or prioritizing the part of the system that is affecting the most people first. We confirm what is available when you book and explain what the schedule covers before anything is set.
Planned work, like a fixture upgrade, a gas line extension, or a water heater replacement before the current unit fails, is easier to schedule with a date attached. Call in the morning. Describe the leak. Hear what the fix involves.
A toilet that rocks, leaks at the base, or has a crack in the porcelain is not a problem to ignore. The wax seal beneath it fails when the fixture moves, and water that escapes at the base works into the subfloor before it becomes visible. We reseat toilets when the seal is the issue and replace them when the fixture itself has failed. For a commercial property or a multi-unit building, we handle the volume that comes with that.
A drain that is slow on one fixture is usually a branch-line problem. When multiple drains in the building are sluggish or backing up at the same time, the issue is almost always in the main line. We clear blockages with snaking for straightforward clogs and hydro jetting for buildup that has narrowed the pipe over time. Hydro jetting is particularly useful in older drain lines where grease, soap, and mineral scale have accumulated in layers.
A drain that clears and then blocks again within weeks is telling you something about the line itself, not just the clog. Root intrusion through pipe joints, a section of pipe that has settled and holds standing water, or a line that has partially collapsed are all conditions that produce repeat blockages. We look at the pattern and, where it points to a structural cause, scope the repair rather than clearing it again and waiting for the next call.
When a sewer lateral or underground supply line is cracked, root-invaded, or deteriorating, the traditional answer was to dig it up. Trenchless methods change that for lines where the pipe material and the surrounding soil allow it. We assess whether the situation is a candidate before recommending it, because not every damaged run is suited to a trenchless approach. Where it works, it reduces the disruption to the yard and the structure considerably.
Shower and bath installation, sink and lavatory work, and vanity builds all involve rough-in plumbing, supply connections, and drain assembly. A bathroom remodel that looks like a finish-carpentry job is usually half plumbing underneath. We handle the supply and drain side from the wall out, and we coordinate with whatever else is happening in the space so the plumbing does not hold up the rest of the project.
A garbage disposal installation involves the drain connection under the sink, the electrical connection, and making sure the P-trap configuration is correct for the setup. When a disposal fails, we diagnose whether the motor, the switch, or the drain connection is the problem before recommending a replacement.
Some plumbing work requires a permit and a follow-up inspection before it is considered complete. Repiping, water heater replacement, gas line work, and new fixture rough-ins are the jobs most commonly attached to permit requirements, though the specifics vary by municipality and sometimes by whether the work affects shared systems in a multi-unit building.
A permit adds a step to the schedule. The work is done, an inspection is requested, and the inspector confirms the installation meets code before the walls close or the system goes back into service. We handle the permit side of jobs that require one, and we factor the timeline into the schedule from the start so it does not catch anyone off guard.
If you are not sure whether a planned job needs a permit, ask on the call. We will tell you what generally applies to that type of work and confirm what the situation looks like at your address. Let us handle the plumbing and the permits. Take a look at our plumbing service list to see what else is covered.
The visible damage from a hidden leak is almost never where the leak is. Water travels along framing, follows pipes through walls, and pools at the lowest point it can reach, which is why a stain on a ceiling or a damp patch on a floor can be several feet from the actual break.
Galvanized, copper and PEX pipes each fail in their own way. Galvanized corrodes from the inside out and eventually develops pinhole leaks along the corroded wall. Copper under a slab develops leaks at stress points from soil movement. PEX fails at fittings more often than along the run. Knowing the pipe material and the system layout shapes where we look first.
We use pressure testing to isolate which line is losing pressure, then electronic detection to locate the source within the structure. That combination means we know exactly where to open the wall or the slab before any material is removed. The scope and the repair cost are confirmed before that work begins.
The visit starts with a look at what is actually happening. We ask about the symptoms, check the affected fixture or line, and run whatever diagnostic the situation calls for, whether that is a pressure test, a camera inspection, or a visual check of the drain configuration. Nothing is opened up until we understand the cause.
Once the diagnosis is done, we explain what we found and what the repair involves. You get the scope and the rate before any work begins. If the job turns out to be different from what was described on the call, we talk through the difference before proceeding. The job is scoped and priced before a wrench comes out.
After the repair is complete, we run the affected lines, check connections, and confirm that pressure and flow are correct at the relevant fixtures. For a water heater replacement, that includes verifying the unit is heating and the pressure relief valve is working. We do not leave until the system has been checked.
We serve Ontario and the surrounding communities throughout San Bernardino County. That includes Eastvale, Chino, Montclair, Upland, and Rancho Cucamonga.
If your property is in the area and you are not sure whether we cover it, call (626) 619-9789 and we will confirm.
Residential and commercial calls are both within scope. Apartment buildings, single-family homes, retail properties, and restaurants across the city and the surrounding area are all part of what we handle. We'll get your water flowing again fast.
For most repairs, the property is left in a workable condition when we finish. If access to a wall or floor was needed, we close the opening before leaving. Any disruption that cannot be fully resolved on the same visit is explained before we go, along with what comes next.
It depends on the appliance and what the existing connection was set up for. A new dishwasher, washing machine, or refrigerator with a water line may need a supply valve, a drain connection, or both. We confirm what is needed on the call before scheduling the installation.
Yes. Commercial calls are part of what we take, including restaurants, retail spaces, office buildings, and multi-unit residential properties. The scope and the approach are the same as a residential call: the job is described on the phone, priced before the visit is scheduled, and carried out with the property's operational needs in mind.
Call (626) 619-9789 and describe the situation.
Yes. Adding a hose bib involves tapping into an existing supply line and running pipe to the exterior. The scope and the cost depend on where the nearest supply line is and how the exterior wall is constructed. Call and describe where you want it and we will work through the details.
Yes. Tenant scheduling is a normal part of multi-unit and rental property work. We confirm access arrangements when the visit is booked and work around what the property requires. If the repair involves shutting water to more than one unit, we factor that into the timing so the disruption is as short as possible.
Yes, in a meaningful way. On a slab, supply lines are often run through the concrete, which means a leak under the foundation requires detection equipment and targeted access. In a crawl space, pipes are accessible from below, which makes inspection and repair more straightforward in most cases.
It can, because some permits require an inspection before or after the work. We factor that into the schedule and let you know what the timeline looks like before anything is booked.
Post-war homes built on slab-on-grade foundations with copper supply lines cast into the concrete are common across the region, and slab leaks are the job that follows from that construction. Galvanized supply lines in older homes corrode from the inside out, producing pressure loss and discolored water before they start leaking visibly. Both situations tend to point toward repiping once they start repeating, and we scope that work on the call before recommending it.
Planned plumbing work, a water heater replacement before the current unit fails, a repipe before the next slab leak, a fixture upgrade tied to a renovation, goes more smoothly when it is scheduled on your timeline rather than by the failure. We are open every day from 7:00 AM to 9:00 PM.
Call (626) 619-9789, describe what you need, and we will get a date on the calendar.
Reach us through Monrovia Plumbing Company at (626) 619-9789 or at [email protected].
There is more on our coverage area. Drain and sewer work nearby: Pomona, Covina, West Covina, Azusa.
Below is a quick look at the plumbing work we handle in Ontario 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 |
|---|---|---|---|
| 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. |
| 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. |
| 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 Ontario homes already on natural gas. |
Call (626) 619-9789 to describe your situation and hear what the fix involves before anything is scheduled.
(626) 619-9789