If you live in the Greater Toronto Area, you already know that our seasonal weather can be tough on homes. Between heavy spring thaws and sudden summer downpours, keeping water out of your basement is a constant battle. Let’s look at exactly what a sump pump is, what it does, and why it is the most important defense system your property can have. Table Of Contents 1. What is a Sump Pump? 2. What Does a Sump Pump Do? 3. How Does a Sump Pump Work? 4. Key Components of a Sump Pump System 5. Do I Need a Sump Pump in My House? 6. Types of Sump Pumps Used in Canada 7. Important City of Toronto Sump Pump Bylaws 8. Installation Styles: Single, Duplex, and Backup Systems 9. What is the Best Sump Pump for a Residential Home? What is a Sump Pump? A sump pump is a mechanical device installed in the lowest part of your basement floor to prevent water from accumulating. Because so many homes in Toronto feature basements built halfway or fully underground, they are naturally exposed to surrounding groundwater. If you are wondering what does a sump pump look like, it typically looks like a rugged piece of machinery sitting inside a covered hole in your floor, connected to a pipe that runs up and out through your basement wall. Its entire job is to catch water before it damages your home and pump it away safely. What Does a Sump Pump Do? The primary function of a sump pump is to pump accumulated groundwater out of your basement and push it safely outside of the house. It is installed inside a specially dug pit in your basement floor to keep the entire lower level dry and prevent your basement from flooding. When heavy rain or a spring thaw causes groundwater to build up around your foundation walls, your home’s weeping tiles collect that water and direct it into the pit. Instead of the water overflowing onto your basement floor, the sump pump automatically kicks into action and forces the water up and out of your home through a discharge pipe. Need Professional Plumbing Help? Our licensed experts are standing by 24/7. Call (416) 383-7378 How Does a Sump Pump Work? There are different types of sump pumps available on the market, and while their installation instructions might vary, the mechanical principle behind how they work always remains exactly the same. The entire process is completely automatic. Sump pumps are installed with a floating device known as a float switch. Once you plug the pump into a standard electrical outlet, you do not need to keep checking the water levels—the system manages itself day and night. Here is how the cycle works: As the pit fills with groundwater, the water level rises and lifts the float switch upward. Once the float rises past a certain point, it sends a message to the pump to turn on and start moving water. The pump rapidly draws water out of the basin and forces it through the discharge pipe to the outside. As the water level decreases inside the pit, the float moves downward. Once the float falls below its set point, it cuts the power and stops the pump until the water builds up again. Key Components of a Sump Pump System Understanding the main parts of your system makes it much easier to diagnose potential issues if you already have one in your home: Sump Pump Pit (Basin): This is a hand-dug hole in your basement floor. It is usually about 28×28 inches in size, with a minimum required basin size of 18 inches in diameter and 30 inches deep. This is where groundwater collects and where the pump sits. The Check Valve: This is a one-way valve connected to the discharge pipe inside the home before the pipe exits the outside wall. Its main job is to prevent water that has already been pumped out from traveling backward into the pit when the pump shuts off. The Discharge Pipe: This is the pipe connected directly to the pump that carries the collected water out of the pit and away from your home. The Float: This is the key activation device. It can be built directly onto the pump or found hanging separately in the pit or from the discharge pipe to control the on/off cycle. Do I Need a Sump Pump in My House? Every house is built differently. The structural design of the land and the soil type around the home all play a major role. While these are technical details a plumber can evaluate, here are two straightforward ways a homeowner can tell if they need sump pump installation: A Wet Basement: If any corner of your basement feels damp or wet all the time, it means groundwater is actively seeping inside. While it might not seem like a big deal during normal weather, this situation can quickly get much worse during a heavy rainstorm or the spring thaw. Flood Plain Location: If your home is located in a designated floodplain area or sits close to a river or lake, you definitely need a system installed (or your house likely had one built-in before you bought it). Types of Sump Pumps Used in Canada There are two primary types of pumps commonly installed in Canadian homes: Submersible Pumps This type of pump goes right at the bottom of the pit and sits completely inside the water. The system is entirely waterproof, runs quietly because it is submerged, and stays hidden inside the basin. Pedestal Pumps A pedestal pump features a motor that is top-mounted on a long metal tube or pedestal. These units are not waterproof like submersible models; the motor must be kept high and dry above the pit. Because of this design, they take up more physical space above the ground. Important City of Toronto Sump Pump Bylaws You cannot just pump groundwater anywhere you want. The City of Toronto has strict bylaws regarding discharge lines that you must follow to avoid legal liabilities: No Sanitary Drain Connections: The discharge pipe that pushes water out is strictly prohibited from connecting to the city’s sanitary main drain. Property Line Clearance: The discharge pipe must drain within your own property lines. It must terminate at a minimum of 1.5 meters away from your foundation wall and 0.5 meters away from your property line. Following these rules ensures you do not cause disturbances to your neighbors. If you point your discharge pipe directly toward a neighbor’s yard, a neighbor who doesn’t have a sump pump might start seeing water seeping into their basement. Legally, you will be held liable for any resulting damage to their property. Installation Styles: Single, Duplex, and Backup Systems Depending on your specific needs, property size, and usage, these pumps are installed using three main configurations: Single System: This is the general setup found in most homes. It features one primary pump inside the pit that handles all the work, powered by a regular household electrical wall outlet. Duplex System: A duplex setup installs two separate sump pumps inside a single pit. The main idea here is to prevent flooding if one pump experiences a mechanical failure. This layout is usually recommended for commercial places that face excessive groundwater and high flood risks. Battery Backup Sump Pump: This is a two-pump setup where your primary pump runs on regular electrical power, and a second backup pump is installed right beside it in the same pit. This secondary pump operates entirely on a separate battery and control panel mounted outside the pit. If a storm knocks out your power or the main pump fails, the battery-powered unit automatically kicks in to keep the water level in a safe zone. Because it is meant for emergencies, it is usually slightly less powerful than the primary pump. What is the Best Sump Pump for a Residential Home? A battery backup sump pump system is hands down the best option for a residential home in Canada. It provides a built-in combination of a heavy-duty primary pump and an emergency battery backup pump in a single system. While this combined setup is a little more expensive upfront compared to a single system, it is nowhere near as costly as the thousands of dollars in damage caused by a flooded basement. It offers the highest level of protection you can get for your home. Don’t Wait for the Next Toronto Rainstorm to Flood Your Basement Protect your home, secure your foundation, and take advantage of the City of Toronto Basement Flooding Protection Subsidy. You can receive up to $2,250 back on a professionally installed sump pump system. Get a reliable, code-compliant installation done by a licensed local expert. CALL US (416)-383-7378 Sump Pump Bylaws & Technical FAQs: A Plumber’s Guide 1. My neighbor's sump pump is draining right onto my property line and turning my lawn into a swamp. Is this legal in Toronto? No, it is not legal. I see this dispute happen all the time in tight Toronto neighborhoods like East York or Leslieville. The City of Toronto bylaw states very clearly that all sump pump water must be managed on your own property. The discharge pipe must finish at least 1.5 meters away from their own foundation and at least 0.5 meters away from your property line. If their pipe is pointing right at your fence line and drowning your grass, they are violating city bylaws and are legally liable for any structural or water damage it causes to your home. 2. Do I need a building permit from the City of Toronto just to dig a pit and install a sump pump? If you are just cutting concrete, digging a basin, and running a pipe through the wall to drain outside onto your own lawn, you generally do not need a specific city building permit for the pump itself. However, if you are doing major structural modifications—like undercutting your foundation or connecting that discharge pipe directly into an underground municipal storm sewer line—then yes, a plumbing and building permit is absolutely mandatory. Even without a permit for a standard yard discharge, the work still must meet the Ontario Building Code standards. 3. I heard the City of Toronto covers the cost of a new sump pump. How does the rebate work? Yes, the city has a program called the Basement Flooding Protection Subsidy Program, and they actually updated it with much better limits. The city will cover up to 80% of the cost, up to a maximum of $2,250 for a licensed plumber to install a new sump pump and alarm. They also added an extra $300 subsidy for a permanently connected battery backup system, plus up to $500 for a home plumbing assessment. To get the cash, the work has to be done by a licensed contractor, you need to take before-and-after photos, and you must submit your invoices online. You have up to two years after the installation to claim it. 4. What does the Ontario Building Code say about the exact size of the sump pit and the cover? I see amateur contractors try to cut corners here all the time by burying a basic 5-gallon Home Depot pail in the ground. That is a massive building code violation. According to the Ontario Building Code (OBC), a proper sump pit must be a minimum of 30 inches deep and 24 inches in diameter. Also, the lid cannot just be a loose piece of plastic. The code specifies that the cover must be airtight (weatherstripped/sealed) to stop moisture and dangerous radon gases from leaking into your living space, and it must be strong enough to resist being removed by children. 5. Can I just hook my sump pump discharge pipe directly into my laundry tub or a basement floor drain? Absolutely not. Tying your sump pump into a laundry sink, a floor drain, or any stack in your basement means you are pumping clean groundwater straight into the city’s sanitary sewer system. This is strictly illegal across Toronto and the entire GTA. During heavy storms, if thousands of homeowners do this, it overloads the city’s sewage treatment plants and causes raw sewage to back up right into people’s basements. Sump water must always go outside to the ground or a dedicated storm system. 6. I am building a legal basement apartment in the GTA. Does the building code force me to install a sump pump? The Ontario Building Code dictates that a sump pit with an automatic pump is mandatory for any basement where natural gravity drainage is not practical. If you are turning a basement into a legal accessory dwelling unit (an apartment), city inspectors will look closely at water management. If the property has a history of moisture, a high water table, or the weeping tiles sit lower than the path out to the city lines, you are 100% required to have a code-compliant sump pump system installed to protect the tenants. 7. What is the deal with water-powered backup sump pumps? Are they legal in Toronto, or should I stick to a battery? Water-powered backups use your home’s municipal water pressure to create suction and pull water out of the pit during a power outage. They are legal, but they come with a catch. First, they require a heavy-duty backflow preventer installed on your water line so dirty pit water can never siphon backward into your drinking water. Second, they use a massive amount of city water to work—usually 2 gallons of fresh city water for every 1 gallon of floodwater they pump out. If you are on a water meter, your bill will skyrocket during a long storm. For 90% of GTA homes, a high-quality battery backup system is a much cleaner and safer choice. 8. My home is old and has no weeping tiles. Does installing a sump pump even do anything if there are no pipes feeding it? Yes, it still helps significantly. In older Toronto areas like The Danforth or High Park, many early-1900s homes were built without external weeping tiles. If you dig a code-compliant sump pit at the lowest point of an old basement, it acts like a relief valve for the ground underneath your slab. As groundwater rises beneath your house, it naturally takes the path of least resistance and fills the pit first. The pump then throws it outside before the water level gets high enough to push up through the cracks in your concrete floor. 9. Can I run my discharge pipe out the basement wall and just let it drain straight into the city storm catch basin on the street curb? No, you cannot run a pipe across the public sidewalk or let it dump straight onto the street curb. In the winter, that water will instantly freeze into a sheet of solid black ice on the public sidewalk, creating a massive safety hazard. The city will fine you quickly for creating a public liability. Your pipe must drain onto a permeable surface (like your lawn or a garden bed) entirely inside your own property lines so the earth can absorb it naturally. 10. Does a standard home insurance policy in Ontario cover me if my basement floods but I don't have a sump pump? In Ontario, standard basic home insurance policies usually do not automatically cover groundwater flooding or sewer backups—you have to buy those as extra add-ons (riders). If you apply for overland water or sewer backup coverage, insurance underwriters will look at your area. If you live in a high-risk flood zone or a low-lying pocket of Toronto, many insurance companies will completely deny your water damage claims or refuse to write the policy unless you can prove you have a professionally installed, working sump pump system with a battery backup.
