Montreal • Laval • North & South Shore
Stop Putting Grease Down the Drain
Hot grease feels harmless—but in Montreal’s cold, older pipes it hardens, traps debris, and causes backups. Use these local disposal steps, early warning signs, and pro methods that actually work.
7–9 min read
Why grease down the drain is a big problem here
In Plateau, Rosemont, NDG, and parts of the West Island, many homes still have clay or early ABS lines. Add long runs to the street and winter freeze-thaw: liquid grease congeals, narrowing your pipe and grabbing food scraps and soap film along the way.
Fast check: A quick HD camera inspection confirms whether you’re seeing grease, scale, roots, or a joint offset—so you choose the right fix.
Prevent surprises. See your line before it fails.
What really happens inside the pipe
Grease doesn’t dissolve—it relocates and solidifies
Hot oils smear along cooler walls, set into a rough film, and create turbulence that traps more debris. Over a season, that film becomes a stubborn choke point.
Winter multiplies the effect
Cold ground temps speed up congealing. Even “small amounts” after frying add up—especially in kitchen branches.
City-scale impact: In mains, grease + wipes + hair can form “fatbergs,” restricting flow and causing odours/overflows. Prevention starts at your sink.
Early warning signs of grease buildup
- Slow kitchen drainage that only briefly improves with hot water.
- Gurgling after the sink drains (air trapped by partial blockage).
- Rancid/sulphur odours near the sink, dishwasher, or floor drains.
- Recurring clogs despite plunging or enzymes.
- Basement backups after heavy kitchen use or big gatherings.
Established grease? 360° cleaning beats “poking a hole.”
Do this, not that
✅ Do
- Wipe pans with a paper towel before washing; toss it.
- Pour cooled grease into a lidded container; trash it.
- Collect used oil in a jug for eco-centre drop-off.
- Use a sink strainer and empty daily.
- Run hot water 15–30 seconds after dishwashing.
🚫 Don’t
- Pour bacon fat, frying oil, or gravy down the drain.
- Rely on chemical openers—harsh, and they don’t remove films.
- Flush “flushable” wipes—they bond with grease.
How to dispose of grease and oil in Montreal
- 1. Let it cool. Safe to handle = ready to store.
- 2. Contain it. Use a metal can or jar. For small amounts, line a bowl with foil, cool, fold, and trash.
- 3. Trash or recycle. Solid fats → household garbage. Many eco-centres accept liquid cooking oil in sealed containers (check your nearest location).
- 4. Wipe cookware. Less residue reaches the pipe.
Cooking a lot? Read our method comparison: Hydro-Jetting vs Cable (Montreal Guide).
Safe DIY maintenance (know the limits)
- Hot-water flush: Run the hottest tap 2–3 minutes after heavy cooking.
- Baking soda + vinegar: Good for odours/thin biofilm (½ cup + 1 cup; wait 10 min; flush hot). Not a cure for thick grease.
- Enzymes: Helpful for upkeep when used regularly; won’t strip hardened films.
Recurring symptoms? Scope it: Drain Inspection for Homeowners (Montreal).
When a professional cleaning makes sense
Start with a view: A camera inspection shows whether you’re fighting grease, scale, roots, or a misaligned joint—so you pick the right tool.
Hydro-jetting for grease: Hydro-jetting services scrub the full circumference, restoring diameter and reducing re-clogs. A cable often just pokes a hole.
Emergency? If sewage is rising in tubs/floor drains, use Emergency Drain Services (Montreal) and avoid running water until help arrives.
Kitchen issues today? See also: Kitchen Sink Clogged — Expert Solutions and Clogged Toilet — Montreal Guide.
Ready when you are. Montreal • Laval • North & South Shore.
FAQ: Grease & Your Drains
Can I pour a small amount with hot water and soap?
It still congeals downstream as it cools. Small amounts add up. Contain and trash instead.
Does dish soap remove grease in pipes?
It briefly emulsifies near the sink; as the mix cools and dilutes, grease redeposits on walls.
Are garbage disposals a solution?
No. They shred food but don’t remove grease film; particles can bond to it.
Is hydro-jetting safe for older pipes?
Yes—when pressure/nozzle match pipe material and condition. Scope first to be sure.
Where can I get help fast?
For urgent backups, go to Emergency Drain Services or Contact us.
Written by Flow Pro Drain Inc. — Montreal • Laval • North Shore. Master-plumber supervised. Certified Drain Report™ available.