Grease Trap Regulations in Quebec

Overview of Quebec FOG Compliance Framework

Quebec regulates commercial fats, oils, and grease (FOG) discharge through four overlapping layers. First, the federal Wastewater Systems Effluent Regulations (SOR/2012-139) under the Fisheries Act SOR/2012-139. Second, the provincial Loi sur la qualité de l'environnement (Environment Quality Act), run by the Ministère de l'Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (MELCCFP) LQE (chapter Q-2). Third, the provincial Code de plomberie (Chapter III of the Quebec Construction Code), run by the Régie du bâtiment du Québec (RBQ) RBQ. Fourth, municipal sewer-use bylaws enforced by cities and metropolitan agglomerations like the Communauté métropolitaine de Montréal and the Ville de Québec.

There is no single province-wide cap on FOG concentration. Hardware standards are set provincially through the National Plumbing Code of Canada (NPC) and the Canadian Standards Association B481 series. Operational rules (pump-out frequency, manifest retention, and discharge limits) are set by each city. Quebec does not use the U.S. Uniform Plumbing Code or the International Plumbing Code. Its model also does not use the "Authority Having Jurisdiction" terminology common in U.S. compliance writing.

Restaurants, cafeterias, bakeries, food processors, and any commercial kitchen with FOG-laden wastewater must comply at every layer. Quebec winters are cold. Grease that escapes the interceptor hardens fast inside the city sewer main. That is why pretreatment enforcement is comparatively strict in Greater Montréal and the Quebec City agglomeration.

Governing Authorities

Provincial Authorities

Ministère de l'Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (MELCCFP). The Ministry holds the main statutory authority for environmental protection and wastewater discharge oversight under the Loi sur la qualité de l'environnement LQE. Public inquiries route through 418-521-3830 or 1-800-561-1616 MELCCFP contact. The Ministry does not typically inspect individual restaurant interceptors. It monitors watershed health and steps in when a city system contaminates surface or groundwater.

Régie du bâtiment du Québec (RBQ). The RBQ runs Chapter III (Plumbing) of the Quebec Construction Code. The Code adopts the National Plumbing Code of Canada with provincial changes Code de construction, c. III. The RBQ licenses contractors who can install plumbing equipment, including grease interceptors. It also inspects work done without a permit or by an unlicensed installer RBQ home.

Municipal Authorities

Communauté métropolitaine de Montréal (CMM) and Ville de Montréal. The metro layer sets discharge limits across Greater Montréal. The Ville de Montréal enforces local pretreatment, permits, and grease-trap rules under Règlement 15-085 sur l'évacuation des eaux usées des résidences isolées et sur les rejets dans les réseaux d'égout Ville de Montréal By-law 15-085. Borough Public Works teams run inspections with the Service de l'eau Montréal Water.

Ville de Québec, Agglomération. The Quebec City agglomeration enforces Règlement de l'agglomération de Québec sur les rejets dans les réseaux d'égout. The bylaw covers sewer discharge limits, banned substances, and pretreatment gear for the City of Québec and the nearby cities Quebec City regulations. Public inquiries route through the Ville de Québec desk at 311 Ville de Québec.

Other municipalities. Laval, Longueuil, Gatineau, Sherbrooke, Trois-Rivières, and other regional cities each issue their own sewer-use bylaws. Check limits and schedules with your local Service de l'environnement or Travaux publics before opening or remodeling a kitchen. Gatineau is the fourth-largest city in Quebec. It enforces sewer discharge under its own bylaw. The Gatineau rule mirrors the basic shape of the Ville de Québec and Ville de Montréal rules: banned substances, fat and oil limits, and a pretreatment requirement before any discharge to the sanitary sewer Ville de Gatineau.

When two or more cities share one agglomeration sewer system, the agglomeration bylaw rules the network. The local bylaw rules the day-to-day inspections and tickets. Operators in suburban Montréal and suburban Quebec City should read both layers.

Installation and Sizing Requirements

Equipment standards in Quebec are set provincially under Chapter III of the Construction Code. Chapter III adopts the National Plumbing Code of Canada with provincial changes. The current edition Quebec uses is the National Plumbing Code 2020, published by the National Research Council of Canada NPC 2020. If you design or replace an interceptor, you must work to the NPC and the supporting CSA B481 series. Do not use U.S. plumbing codes.

Sizing Standards

The National Plumbing Code 2020 sends designers and installers to CSA B481.0 for material, design, and construction. It sends them to CSA B481.3 for sizing, selection, location, and install of grease interceptors CSA B481 series. Sizing formulas from the U.S. Plumbing and Drainage Institute G-101 standard are not automatic in Quebec. The interceptor itself must carry the CSA B481 stamp. The flow calculation method does not change that.

Quebec hydromechanical interceptors are usually rated by flow in litres per minute or gallons per minute. They have a matching grease-retention rating in kilograms or pounds. A common shortcut: multiply gallons per minute by two to estimate pound capacity. This matches the CSA B481.3 approach. It does not replace a code-compliant calculation by a licensed engineer or plumbing contractor CSA B481.3.

Installation Standards

Under Chapter III of the Quebec Construction Code, any plumbing work that installs, replaces, or changes a grease interceptor must be done by a contractor licensed by the RBQ RBQ licensing. Work done without a licensed contractor is invalid for code compliance, no matter how good the install. The owner can also face penalties under the Loi sur le bâtiment Loi sur le bâtiment.

Quebec city bylaws restrict chemical or biological additives. These products are sold as enzymes, bacteria, or grease digesters. They are dosed into the interceptor between pump-outs. They are usually not accepted in place of mechanical removal of FOG. Ville de Montréal By-law 15-085 bans any practice that emulsifies grease so it can bypass the interceptor and enter the public sewer By-law 15-085.

Cleaning and Maintenance Frequency

Quebec cities apply the standard "25% Rule" as the default trigger for an interceptor pump-out. Under this rule, a licensed waste hauler must fully empty the interceptor once the combined volume of floating grease plus settled solids hits 25% of the unit's total liquid capacity. The 25% threshold is the operational standard recognized by Ville de Montréal, the Ville de Québec agglomeration, and the major Quebec sanitation contractors that pump commercial interceptors Ville de Montréal By-law 15-085.

For high-volume kitchens (full-service restaurants, banquet halls, institutional cafeterias), the 25% threshold is often reached in 30 to 90 days. For lower-volume kitchens, intervals of four to six months are typical. Do not rely on calendar intervals alone. A logged sludge and grease measurement at each service is the only verifiable way to show compliance with the 25% Rule to a city inspector.

Pumping must be a complete evacuation of the interceptor. The practice of "decanting" (a hauler pumps the tank, separates the wastewater fraction on the truck, and discharges it back into the interceptor to save volume) does not match the 25% Rule. Ville de Montréal inspectors treat it as a non-compliant service By-law 15-085.

Record-Keeping and Manifest Requirements

Quebec cities require commercial operators to keep paperwork. The paperwork must prove the interceptor was pumped on schedule and that the waste went to a permitted treatment facility. The licensed hauler issues a service manifest. The manifest typically records the date of service, the volume removed, the destination treatment site, and the licence numbers of both the hauler and the receiving facility. Ville de Montréal inspectors may demand these records during routine or complaint-driven inspections under By-law 15-085 By-law 15-085.

Transporters of grease-trap residue in Quebec must hold the right MELCCFP authorization. The rules cover the transport of residual materials. They include the Règlement sur les matières dangereuses when the residue is hazardous. The broader licensing framework runs under the Loi sur la qualité de l'environnement Règlement sur les matières dangereuses. Confirm any contracted hauler holds current authorization before you sign the service manifest.

Keep records on site for at least two years. Make them available on request. A clean inspection record paired with a complete set of manifests is the operator's primary defence in any enforcement action.

Fines and Penalties

Penalties for FOG-related violations in Quebec are set at the city level, not the provincial level. They are much smaller than the catastrophic environmental fines authorized under the Loi sur la qualité de l'environnement. The routine framework that applies to a missed pump-out, an unmaintained interceptor, or a missing manifest is the local sewer-use bylaw, not the provincial statute.

Ville de Montréal

Under Ville de Montréal Règlement 15-085, fines for ordinary FOG offences fall in the range of about $500 to $1,000 per offence for an individual. Higher amounts apply to corporations and to repeat offences By-law 15-085. The bylaw schedule raises fines for repeat offences within a fixed period. On top of the fine, the city may bill an operator for any direct costs of fixing a sewer blockage caused by the violation.

The much larger maximums sometimes cited online (figures in the hundreds of thousands of dollars) relate to environmental offences under the Loi sur la qualité de l'environnement. Those apply to catastrophic discharges or industrial dumping. They do not apply to ordinary grease-trap maintenance violations under the city sewer bylaw LQE. Do not conflate the two.

Ville de Québec Agglomération

The Ville de Québec agglomeration sets penalties for sewer-discharge violations under its own bylaw. The bylaw is enforced across the agglomeration. Routine offences for missed maintenance, banned discharges, or absent records are handled under the agglomeration's penal schedule. First-offence fines for individuals start at several hundred dollars. They rise for corporations and repeat offences Quebec City regulations.

Provincial Environmental Penalties

Sometimes a FOG event grows beyond the city sewer system. One example: an illegal direct discharge of grease-trap residue to a waterway. The matter then shifts from the city sewer-use bylaw to the Loi sur la qualité de l'environnement. The LQE authorizes administrative monetary penalties and penal sanctions that are much larger than city fines. Maximum amounts scale with the gravity of the offence and with whether the offender is an individual or a corporation LQE penalty regime. These provincial penalties apply to a small minority of FOG cases. Read them as the ceiling, not as the typical penalty for a missed pump-out.

If you keep a code-compliant interceptor, follow the 25% Rule, and keep a full set of service manifests, you have a clear, primary-source defence against any inspection finding under either layer.