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24/7 Emergency Plumber in St. Catharines, ON

From a burst pipe at 2 a.m. to a dripping faucet you've been ignoring for months, ExpressFlow Plumbers St. Catharines handles residential and commercial plumbing of any size. We answer 24 hours a day, send a licensed plumber fast, and agree on the price before any work starts. Most jobs are fixed the same day you call.

Plumber in St. Catharines repairing a leaking pipe

Emergency Plumber in St. Catharines, Day or Night

Some plumbing problems can't wait until Monday. Our 24 hour plumbers in St. Catharines are on call for the four failures that cause the most damage when they're left overnight.

Main Drain Emergencies

Toilets gurgling, the shower filling up when the washer drains, or water at the basement floor drain usually means the main line is blocked. We clear it with a cable machine or hydro-jetting, then run a camera to show you the cause.

Drain cleaning in St. Catharines →

No Hot Water

A pilot that won't stay lit, a tripped element or a tank leaking onto the floor. We repair gas and electric tanks and tankless units, and when a tank has failed we replace it as quickly as possible.

Water heater repair →

Boiler Breakdowns

Cold radiators in January, a boiler that keeps locking out, or water dripping from the relief valve. We check pressure, the circulator pump and ignition, and work to get the heat back on the same visit.

Boiler repair →

Sump Pump Failure

The pit is full and the pump is silent, or it runs non-stop during a storm. We fix stuck floats and burnt-out motors, replace failed pumps on the spot, and can add a battery backup for power outages.

Sump pump repair →

Expert Plumbing Services in St. Catharines You Can Rely On

Plumbing Installation in St. Catharines, ON

You want to be sure that your new plumbing system or fixtures are installed correctly, and at ExpressFlow Plumbers St. Catharines we make sure of it. Whether you want to upgrade your faucets, install a new water heater, replace a toilet or put in a well pump, our certified team does it all to code and safely. We use top-quality materials and professional tools so your installation lasts for years, and we work carefully to keep disruption to your home or business to a minimum. Call us to get your new fixture or appliance installed right the first time.
Plumbing installation in St. Catharines

Plumbing Repair in St. Catharines, Ontario

Dealing with leaky faucets, running toilets, burst pipes or clogged drains? At ExpressFlow Plumbers St. Catharines, we fix problems of any complexity, including low water pressure, sewer line problems and sump pump failures. Leak detection equipment, drain cameras and hydro-jetting let us pinpoint the root of the problem quickly instead of patching the symptom. Small repairs are scheduled at a time that suits you, and urgent ones are handled 24/7.
Plumbing repair in St. Catharines

Plumbing Maintenance in St. Catharines, ON

Most plumbing emergencies give warning signs first: a sump pump that hums but won't start, rust at the base of a water heater, a drain that has been slow for weeks. Our certified plumbing contractors service faucets, toilets, drains, water heaters and sump pumps, check your pipes for leaks, corrosion and blockages, and suggest preventive steps before freeze-up or the spring storms. Regular maintenance costs far less than a burst pipe or a flooded basement.
Plumbing maintenance in St. Catharines

Burst Pipe or Leak? What to Do Before We Arrive

A few minutes of the right steps can save thousands in water damage. Call us first, then work through this list while your plumber is on the way.

  1. 1

    Shut off the main water valve

    In most St. Catharines homes it's in the basement on the front wall, where the water line comes through the floor next to the meter. Turn it clockwise until it stops. A lever valve closes with a quarter turn.

  2. 2

    Turn off the water heater

    With the water off, the tank can overheat. On a gas tank, turn the control knob to "Pilot" or "Vacation". On an electric tank, switch off its breaker. Don't try to drain it yourself; the water is scalding.

  3. 3

    Stay clear of water and electricity

    If water is near outlets, the furnace or the electrical panel, don't walk into it. Only switch off breakers if you can reach the panel while standing on a dry floor.

  4. 4

    Sewer backup? Stop using water

    Don't flush, shower or run the dishwasher or washer. Everything you use upstairs comes back up through the basement drain. Keep kids and pets away from the water.

  5. 5

    Drain the lines

    With the main off, open the lowest cold tap in the house and one upstairs tap to empty the pipes. If a pipe is frozen, never thaw it with a torch or open flame.

  6. 6

    Take photos for insurance

    Photograph the water, the source and any damaged items before you move them, then lift valuables off the floor. Your insurer will ask for these.

Smell gas? That's not a plumbing call. Leave the house without switching anything on or off, then call 911 and Enbridge Gas at 1-866-763-5427 from outside.

Get in Touch

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Need a 24 Hour Plumber in St. Catharines?

Whether it's a burst pipe tonight or a repair you'd like booked for next week, ExpressFlow Plumbers St. Catharines is here any time. We give you an arrival time on the phone, diagnose the problem with modern tools, and fix it right the first time.

(289) 906-9704
24 hour plumber in St. Catharines

All Plumbing Services Done By Pros in St. Catharines

Water Heater Service

Our licensed plumbers in St. Catharines install, repair, replace and service both tank and tankless water heaters. We check for leaks, sediment buildup and worn-out components. Whether it's a minor repair, routine maintenance or a full replacement, we make sure your water heater runs efficiently and safely.

Learn more →

Toilet Repair & Installation

Toilet running nonstop, clogged or not flushing properly, or want a new one installed? ExpressFlow Plumbers St. Catharines fixes faulty flappers, fill valves, broken flush handles and more. We also remove your old toilet, install the new one and seal it properly.

Learn more →

Sump Pump Services

If your sump pump won't start, makes strange noises or can't keep up with the water, we can help. Our plumbers repair and replace pumps, help you choose the right model for your basement, and upgrade older pumps before they fail.

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Sewer Line Repair & Replacement

Slow drains, bad odours or frequent backups? Our certified plumbers use sewer cameras to find the problem quickly and repair cracks and root intrusions. If a full replacement is needed, we do it carefully to protect your property.

Learn more →

Leak Detection

A water bill that keeps climbing, a damp spot on the ceiling or the sound of running water when everything is off. We locate hidden leaks behind walls and under floors with specialized equipment, so we open up only what we need to.

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Pipe Repair & Repiping

Leaky, corroded or burst pipes are repaired or replaced with copper, PEX or PVC. Pipe inspection cameras and trenchless techniques help us keep disruption to your home to a minimum, for long-lasting results.

Learn more →
Licensed plumber in St. Catharines with repair tools

Why Homeowners Trust Our Plumber in St. Catharines

Open 24/7, including holidays

Warranty on all workmanship

Price agreed before work starts

Over 1,000 jobs completed

Cost-effective, eco-friendly services

Local office in downtown St. Catharines

5-Star Customer Feedback

What St. Catharines Customers Say About Us

★★★★★
"Had an emergency leak under the kitchen sink and they showed up the same day. Fixed everything quickly and cleaned up after. Super professional service."

Daniel K.

St. Catharines, ON

2026-01-05

★★★★★
"They installed our new water heater and everything went smoothly. Explained how it works and made sure everything was safe before leaving."

Olivia M.

St. Catharines, ON

2026-01-12

★★★★★
"Our drain was completely clogged and nothing worked. The technician used proper tools and cleared it fast. Works like new now."

Michael R.

St. Catharines, ON

2026-01-18

★★★★★
"We had low water pressure for weeks. They found the issue in the system and fixed it properly. Big difference right away."

Jason P.

St. Catharines, ON

2026-01-26

★★★★★
"Booked them for sump pump maintenance before winter. Everything was checked and cleaned. Feels much safer now."

Emma L.

St. Catharines, ON

2026-02-03

★★★★★
"Very impressed with the service. Fixed our toilet issue quickly and gave helpful advice to avoid future problems."

Sophia D.

St. Catharines, ON

2026-02-10

Plumbing Questions from St. Catharines Homeowners

Straight answers to the questions we hear most often on the phone.

How fast can an emergency plumber get to my home in St. Catharines?
We answer 24/7 and dispatch the nearest licensed plumber right away. You get an arrival time on the phone, not a vague window. On storm nights and during deep freezes, active flooding, sewage backups and homes with no heat go to the front of the line.
How is an emergency plumbing visit priced?
You get a clear price before any work begins, and nothing is done without your approval. If a temporary fix can get you through the night and the permanent repair can be booked later, we explain both options so you can choose.
What counts as a plumbing emergency, and what can wait until morning?
Call right away if water is leaking and you can't stop it, sewage is coming up a drain, your only toilet is blocked, the boiler is off in freezing weather, or the water heater is leaking. A dripping faucet, one slow drain while the others work, or a running toilet (close the small valve behind it) can usually wait for a regular visit. If you smell gas, leave the house and call 911 and Enbridge Gas at 1-866-763-5427. That's not a plumbing call.
Where is my main water shut-off valve, and what if it won't turn?
In most St. Catharines houses it's in the basement on the wall facing the street, where the water pipe comes up through the floor beside the meter. Turn it clockwise to close. Older gate valves often seize, so don't force one with a wrench: a snapped stem makes the leak worse. If it won't move, call us and we'll talk you through it. If the curb stop outside needs to be closed, that's done by the City of St. Catharines (905-688-5600).
Sewage is backing up into my basement. Is it my problem or the City's?
In St. Catharines, the homeowner is responsible for the sewer pipe from the house to the property line, and the City is responsible for the part under public property and the main sewer. We clear the blockage and run a camera to show where it is. If it's on your side (roots, a collapsed or sagging pipe), we fix it. If it's on the City's side, you'll have the camera footage to report it. Stop using water in the house until the line is clear.
My basement flooded. What should I do first?
First, stay out of the water if it's near outlets, the furnace or the electrical panel. Then find the source: clean water from a pipe means shut off the main valve; water rising from the floor drain means a sewer backup; water coming through the walls during rain usually means the sump pump has failed or can't keep up. Take photos, call your insurance company, and report basement flooding to the City of St. Catharines at 905-688-5600. We can fix or replace the sump pump and clear the drain the same day.
Is there a St. Catharines rebate for a backwater valve or sump pump?
Yes. The City's Flood Alleviation Program (FLAP) rebates up to 90% of eligible costs, to a maximum of $5,000, for single- and semi-detached homes built before 2012. It covers backwater valves and disconnecting weeping tiles from the sanitary sewer and connecting them to a sump pump. Check your eligibility with the City before the work starts.
I have no hot water. What if my water heater is a rental?
If you own the tank, most fixes (a thermocouple, gas valve, element or thermostat) are done in one visit, and a tank leaking from the bottom needs replacing. Many Ontario homes rent their water heater, so check for a rental sticker on the tank. A rented tank is repaired by the rental company, but if it's leaking we can still come out, shut it down and stop the water damage while you wait for them.
My boiler stopped heating at night. What can I check myself?
Check that the thermostat is set to heat and has working batteries, that the boiler's breaker or service switch is on, and look at the pressure gauge. A home boiler usually sits around 12–15 psi when cold. Pressure well below that, or water dripping from the relief valve, means it needs a technician. Don't keep pressing the reset button, because repeated lockouts point to a real fault.
How do I deal with frozen pipes, and how do I prevent them?
If a pipe has burst, shut off the main valve and call us. If it's only frozen (no water at a tap), open that tap and warm the pipe with a hair dryer, starting at the tap end, and never use a torch or open flame. Pipes usually freeze on outside walls, in crawl spaces and garages, or near the outdoor tap. Before winter, disconnect garden hoses and close the inside shut-off to outdoor taps, keep the heat at no less than about 13°C when you're away, and let a tap drip on the coldest nights.
Can you help with an insurance claim for water damage?
Yes. We can photograph the damage and its cause, note what failed and why, and give you an itemized invoice, which is what insurance adjusters usually ask for. Also check your policy: in Ontario, sewer backup coverage is often an optional add-on, so a burst pipe and a sewer backup may be treated differently by your insurer.
Do you also do regular plumbing work, not just emergencies?
Yes. Along with 24/7 emergency calls, we handle scheduled work across St. Catharines: faucet and toilet installation, water heater replacement, drain cleaning, sump pump upgrades, leak detection, water softeners and sewer line repair. You can book a visit online or by phone at a time that suits you.

St. Catharines Neighbourhoods We Serve

  • Port Dalhousie
  • Downtown St. Catharines
  • Western Hill
  • Vansickle
  • Merritton
  • Grantham
  • North End St. Catharines
  • Lakeport
  • Fitzgerald
  • Haig
  • Secord Woods
  • Queenston
  • Martindale
  • Grapeview
  • Barbican Heights
  • Burleigh Hill
  • Old Glenridge
  • Glenridge
  • Oakdale
  • Port Weller
  • Louth
  • Drummond Road Area
  • Ker Village / Facer Street Area
  • Dickson Hill
  • Lakeshore Area
  • West St. Catharines