Restaurant Plumbing Montreal: Grease Traps, Drains & Compliance Guide (2026)
Updated February 2026 | By the Plumbing Montreal Commercial Team
For Restaurant Owners & Managers
Proper restaurant plumbing in Montreal starts with three essentials: a properly sized grease trap, a scheduled drain maintenance program, and full Quebec regulatory compliance. Grease trap installation costs $1,500–$8,000+ CAD depending on size and type, while professional cleaning runs $200–$600 per service. Non-compliance can result in fines, mandatory shutdowns, and sewage backups that close your doors mid-service.
Running a restaurant in Montreal means juggling food quality, staff management, customer experience, and — often overlooked — your plumbing system. Yet nothing shuts down a busy kitchen faster than a backed-up drain, an overflowing grease trap, or a failed health inspection.
Whether you are opening a new restaurant on Rue Saint-Denis, renovating a commercial kitchen in Old Montreal, or managing an established eatery in the Plateau, your plumbing infrastructure is the invisible backbone of your operation. When it works, nobody notices. When it fails, everybody does.
This guide covers everything Montreal restaurant owners need to know about commercial kitchen plumbing — from grease trap requirements and drain maintenance to Quebec compliance rules and cost planning. Consider this your operational playbook for keeping the kitchen running and the inspectors satisfied.
📑 In This Guide
- Restaurant Plumbing Essentials
- Grease Traps: Types, Sizing & Installation
- Commercial Drain Maintenance
- Quebec Compliance & Regulations
- Commercial Plumbing Costs (2026)
- 5 Most Common Restaurant Plumbing Problems
- Opening a New Restaurant? Plumbing Checklist
- Preventive Maintenance Schedule
- Why Choose a Commercial Plumbing Specialist
- FAQ — 10 Questions Answered
Restaurant Plumbing Essentials: What Every Montreal Kitchen Needs
A commercial kitchen has fundamentally different plumbing demands than a residential home. Here are the core systems every Montreal restaurant must have in place:
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Grease Trap / Interceptor
Mandatory for all food service establishments. Captures fats, oils, and grease (FOG) before they enter the sewer system.
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3-Compartment Sink System
Required for wash-rinse-sanitize cycles. Must be plumbed with proper drainage connected to the grease trap.
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Floor Drains & Drain Screens
Commercial floor drains must handle high volumes. Screens prevent food solids from entering the drain system.
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Commercial Water Heater
Restaurants need high-capacity hot water systems for dishwashing, sanitizing, and food prep — often 70°C+ for sanitization.
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Customer & Staff Restrooms
Must meet Quebec Building Code requirements for fixture counts based on occupancy. Separate handwashing stations for kitchen staff are mandatory.
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Backflow Prevention
Backflow prevention devices protect the municipal water supply from contamination — a health code requirement for all commercial food operations.
Grease Traps: Types, Sizing & Installation for Montreal Restaurants
A grease trap (also called a grease interceptor) is the most critical piece of restaurant plumbing infrastructure. It captures fats, oils, and grease (FOG) from kitchen wastewater before they enter the municipal sewer system — where they would cool, solidify, and cause major blockages.
Types of Grease Traps
How Grease Trap Sizing Works
Grease trap sizing depends on the number of fixtures connected to it, the flow rate from those fixtures, and the volume of FOG your kitchen produces. Key factors include:
- Number of sinks, dishwashers, and floor drains discharging into the trap
- Seating capacity and average meals served per day
- Menu type — fryers and grill-heavy menus produce significantly more FOG
- Local regulations (no more than 4 fixtures per trap in many jurisdictions)
A CMMTQ-certified plumber will calculate the correct trap size based on your kitchen layout, fixture count, and projected volume. Undersized traps overflow and fail inspections; oversized traps are an unnecessary expense.
⚠️ Important: In Montreal and across Quebec, grease traps are mandatory for all food service establishments — including restaurants, cafeterias, hotels, catering kitchens, and mobile food vendors. Operating without one can result in fines, forced closure, and liability for sewer damage.
Commercial Drain Maintenance for Restaurants
Restaurant drains handle exponentially more volume, heat, and waste than residential systems. Without regular maintenance, grease buildup, food debris, and mineral deposits will narrow your drain lines — eventually causing backups during your busiest service hours.
Here is what a professional commercial drain maintenance program should include:
Professional hydro-jetting or snaking of all kitchen drain lines every 1–3 months, depending on volume. High-output kitchens (fryers, grills) need monthly service. This prevents the slow buildup that leads to sudden, catastrophic blockages.
Grease traps must be pumped before FOG and solids reach 25% of the trap’s capacity. For most Montreal restaurants, this means professional cleaning every 2–12 weeks. High-volume establishments (production kitchens, quick-service restaurants) often need bi-weekly or monthly service.
Floor drains should be cleaned and screens cleared daily by kitchen staff. Professional deep cleaning of floor drain lines should be scheduled quarterly. Standing water or slow drainage in floor drains is a health hazard and a code violation.
Customer and staff restrooms see heavy use. Toilets, sinks, and faucets should be inspected monthly for leaks, clogs, and fixture damage. A malfunctioning restroom directly impacts customer experience and health inspection scores.
Annual sewer camera inspections of your main drain and sewer lines identify developing problems — root intrusion, pipe deterioration, grease accumulation — before they cause emergencies.
Commercial Plumbing for Montreal Restaurants
Call (514) 316-9154
Grease traps • Drain cleaning • Emergency service • All boroughs
Quebec Compliance & Regulations for Restaurant Plumbing
Montreal restaurant owners operate under multiple layers of regulation. Non-compliance is not just a fine — it can mean forced closure, loss of your food service permit, and personal liability for sewer system damage. Here is what you need to know:
Municipal Sewer Bylaws
The City of Montreal regulates what enters the municipal sewer system. Grease traps are mandatory for all food service establishments. Regular pumping and maintenance logs must be kept and made available for inspection. FOG discharges that damage city infrastructure can result in the cost being charged back to the restaurant.
Quebec Construction Code
All commercial plumbing work must comply with the Quebec Construction Code, administered by the Régie du bâtiment du Québec (RBQ). This includes grease trap sizing, backflow prevention, fixture requirements, and hot water capacity. Only CMMTQ-certified plumbers may perform commercial plumbing installations and modifications.
MAPAQ Food Safety
The Ministère de l’Agriculture, des Pêcheries et de l’Alimentation du Québec (MAPAQ) conducts food safety inspections that include plumbing compliance. Inadequate handwashing stations, cross-contamination risks from faulty plumbing, and improper waste disposal can all trigger violations and fines.
Maintenance Records
Keep detailed records of every grease trap pumping, drain cleaning, and plumbing service. These logs must include dates, service performed, company name, and licence numbers. Inspectors may request them at any time. Many restaurants maintain digital logs for easy access.
💡 Pro Tip: Partner with a single commercial plumbing provider for all your drain, grease trap, and fixture maintenance. A consistent provider knows your system, spots developing issues early, and can provide the unified maintenance log inspectors want to see.
Commercial Restaurant Plumbing Costs in Montreal (2026)
These costs are a fraction of what you will pay if a grease-clogged drain backs up during a Friday dinner service. For detailed pricing, see our Montreal plumber cost guide.
5 Most Common Restaurant Plumbing Problems in Montreal
- Grease-clogged drain lines — The #1 issue. FOG accumulates inside pipes over weeks and months, gradually narrowing them until water cannot pass. Prevention: scheduled drain cleaning and proper FOG disposal by staff.
- Overflowing grease traps — Traps that are not pumped on schedule overflow, sending FOG directly into the sewer and producing overwhelming odours. Prevention: cleaning every 2–12 weeks based on volume.
- Sewer backups during peak service — The worst-case scenario. A backed-up sewer line during dinner service can force immediate closure. Prevention: annual camera inspections and proactive maintenance.
- Low hot water capacity — An undersized or poorly maintained water heater cannot keep up with dishwashing, sanitization, and handwashing demands during peak hours. Prevention: annual service and proper sizing.
- Leaking pipes and fixtures — Constant use, heat, grease, and cleaning chemicals accelerate wear on commercial plumbing. Even small leaks waste water, create slip hazards, and can lead to mold. Prevention: monthly visual inspections and immediate repairs.
Opening a New Restaurant in Montreal? Plumbing Checklist
If you are building out a new commercial kitchen or renovating an existing space, use this checklist to ensure your plumbing is code-compliant and operationally sound:
- ✅ Hire a CMMTQ-certified commercial plumber before finalizing your kitchen layout — plumbing drives layout decisions, not the other way around.
- ✅ Size and install the correct grease trap based on your fixture count, menu, and projected volume.
- ✅ Install backflow prevention devices as required by the Quebec Construction Code.
- ✅ Plan for adequate hot water capacity — commercial kitchens typically need 70°C+ for sanitization cycles.
- ✅ Install 3-compartment sinks with proper drainage routed to the grease trap.
- ✅ Include separate handwashing stations in the kitchen, prep area, and restrooms.
- ✅ Install floor drains with screens in all kitchen and prep areas.
- ✅ Ensure gas line connections are properly installed for ranges, grills, ovens, and fryers (must be done by certified gas fitters). Appliance water line connections for ice machines, coffee systems, and steamers must also be professionally installed.
- ✅ Connect commercial dishwashers with proper water supply, drainage, and backflow protection.
- ✅ Set up a preventive maintenance contract with a commercial plumber before you open.
Preventive Maintenance Schedule for Restaurant Plumbing
Why Choose a Commercial Plumbing Specialist
Not every plumber understands the demands of a commercial kitchen. When selecting a restaurant plumber in Montreal, look for these qualifications:
- CMMTQ certification — Required for all plumbing work in Quebec. Verify licence numbers before any work begins.
- Commercial kitchen experience — A plumber who understands grease trap sizing, high-volume drain systems, and commercial water heater requirements.
- Emergency availability — Plumbing emergencies do not wait for business hours. Choose a provider with 24/7 emergency service.
- Maintenance contracts — A reliable partner who schedules recurring service, maintains logs, and keeps your system compliant year-round.
- Familiarity with Montreal boroughs — Different boroughs may have additional requirements. An experienced local plumber knows the regulations that apply to your specific location.
Plumbing Montreal’s commercial division has worked with restaurants, cafés, hotels, and food service businesses across the island. From new kitchen buildouts in the Mile End to grease trap replacements in Verdun, we bring the expertise Montreal’s restaurant industry demands.
Frequently Asked Questions: Restaurant Plumbing Montreal
Are grease traps required for restaurants in Montreal?
Yes. Grease traps are mandatory for all food service establishments in Montreal and across Quebec. This includes restaurants, cafés, cafeterias, hotel kitchens, catering facilities, and mobile food vendors. Operating without a properly functioning grease trap can result in fines, mandatory closure, and liability for municipal sewer damage.
How often should a restaurant grease trap be cleaned?
Most Montreal restaurants should have their grease trap professionally pumped every 2–12 weeks. The exact frequency depends on kitchen volume, menu type, and trap size. High-volume kitchens with fryers and grills often need service every 2–4 weeks. The trap should be cleaned before FOG and solids reach 25% of its total capacity.
How much does grease trap installation cost in Montreal?
Costs range from $300–$1,500 for a small under-sink unit to $3,000–$8,000+ for a large in-ground interceptor. The price depends on the type, size, number of connected fixtures, and complexity of the plumbing modifications required. Installation must be performed by a CMMTQ-certified plumber to ensure code compliance.
What happens if my restaurant does not have a grease trap?
Without a grease trap, FOG enters the municipal sewer system where it cools, solidifies, and blocks pipes. Consequences include sewage backups into your business or neighbouring properties, health code violations, fines, potential temporary or permanent closure, and liability for any damage to the city’s sewer infrastructure.
What should never go down a restaurant drain?
Never pour cooking oil, grease, or fat down any drain — even with a grease trap in place. Also avoid fibrous food waste (celery, corn husks), coffee grounds in bulk, flour or starchy foods, and chemical drain cleaners (they damage pipes and grease traps). Train all kitchen staff to scrape plates and pans into waste bins before washing.
How do I choose the right size grease trap for my restaurant?
Grease trap sizing is based on the number and type of fixtures connected, flow rates, and your kitchen’s FOG output. Generally, no more than 4 fixtures should connect to a single trap. A CMMTQ-certified plumber can calculate the correct size based on your kitchen layout and projected meal volume. Undersizing is a common and costly mistake.
Can I install a grease trap myself?
No. In Quebec, commercial plumbing installations must be performed by a CMMTQ-certified plumber to comply with the Quebec Construction Code. DIY installation will not pass inspection, voids any warranty, and puts your food service licence at risk. Always hire a licensed commercial plumber.
What plumbing do I need for a new restaurant buildout in Montreal?
At minimum: a properly sized grease trap, 3-compartment sinks, dedicated handwashing stations, floor drains with screens, a commercial water heater, customer and staff restrooms meeting occupancy requirements, backflow prevention devices, and gas line connections for cooking equipment. A commercial plumber should be involved from the design phase.
How do I prevent drain backups in my restaurant?
Three strategies: First, maintain your grease trap on schedule. Second, schedule professional drain cleaning every 1–3 months (hydro-jetting is most effective). Third, train staff on proper FOG disposal — scrape plates, use drain screens, and never pour oil down the drain. An annual sewer camera inspection catches developing problems before they cause emergencies.
Does Plumbing Montreal service restaurants?
Yes. Plumbing Montreal provides full-service commercial plumbing for restaurants, cafés, hotels, and food service businesses across the Greater Montreal Area. Services include grease trap installation and maintenance, commercial drain cleaning, water heater service, emergency repairs, and new restaurant buildout plumbing. Call (514) 316-9154 for a commercial consultation.
Keep Your Kitchen Running — Call Montreal’s Commercial Plumbing Experts
Grease traps, drain cleaning, compliance, emergency service — all boroughs.
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