Toilet Plumbing — Repair, Replacement & Clog Service

Delex Plumbing handles all toilet plumbing in Mississauga — running toilets, clogged toilets, fill valve and flapper replacement, wax ring installation, and complete toilet replacement. Licensed, insured, same-day service, flat-rate pricing.

Running Toilet Repair — Fill Valve, Flapper & Float

A running toilet is the most water-wasteful common household plumbing problem. A continuously running toilet wastes 200 litres of water per day — approximately 6,000 litres per month, enough to increase a Mississauga water bill by $20 to $40 monthly. The cause is almost always one of three components: a worn flapper that no longer seals the flush valve seat, a failing fill valve that cannot shut off when the tank reaches full, or a float that is set too high allowing water to continuously run into the overflow tube.

We diagnose a running toilet by adding food colouring to the tank and checking for colour in the bowl within 10 minutes without flushing — colour in the bowl confirms a leaking flapper. We also check the fill valve shut-off by observing whether the valve closes fully when the float reaches the set level. A complete toilet rebuild kit — fill valve, flapper, and supply line — costs $30 to $50 in parts and typically resolves all three potential causes in a single repair.

For toilets where the fill valve is cycling on and off every few minutes without flushing (called phantom flushing), the flapper is leaking slowly enough that the tank drains drop below the fill valve cut-on point, triggering a refill cycle. This wastes water continuously and is stopped completely by flapper replacement.

Toilet tank seepage — water that appears on the floor around the base of the toilet from the tank area rather than the base — typically comes from condensation on the outside of the tank in humid weather, or from a crack in the tank wall. Condensation is managed with a tank liner or a tempering valve that warms the cold water entering the tank. A cracked tank requires toilet replacement — tank cracks cannot be repaired permanently.

Clogged Toilet — Clearing & Drain Inspection

A clogged toilet that cannot be cleared with a standard household plunger requires a closet auger — a specialized drain snake designed to navigate the toilet trap without scratching the porcelain. A professional closet auger reaches 3 to 6 feet through the toilet trap and into the drain branch, retrieving or breaking up the blockage that a plunger’s suction force cannot dislodge.

Toilets that clog repeatedly without an obvious cause — without excessive tissue or non-flushable items being introduced — typically have a partially blocked drain branch below the toilet, a low-flow toilet with insufficient flush volume, or a sewer lateral that is partially blocked with root intrusion. We investigate repeat clogs with a camera scope of the drain branch to identify structural causes.

A toilet that drains slowly — swirls but does not flush completely — is most often caused by clogged rim jets. These are the holes under the toilet rim through which the flush water enters the bowl. Mineral scale from Peel Region’s hard water blocks these jets progressively. We clean the rim jets using a wire tool and scale remover during the service call.

Non-flushable items that are the most common cause of sudden toilet blockages in family homes include hygiene wipes (even those labelled flushable do not dissolve appropriately for Canadian sewer systems), dental floss, cotton swabs, and children’s toys. For blockages that do not clear with a professional closet auger, we use a toilet camera or extraction tool to retrieve the obstructing object rather than forcing it further into the drain.

Toilet Replacement & Installation

Toilet replacement involves removing the old toilet, inspecting the toilet flange condition, installing a new wax ring, setting the new toilet, and connecting the water supply. We include flange inspection in every toilet replacement — a damaged or corroded toilet flange must be repaired before the new toilet is set, as a compromised flange allows the toilet to rock, which breaks the wax seal and allows sewer gas to enter the bathroom.

Modern low-flow toilets (4.8 litres per flush under current Ontario code) use a larger trap diameter and optimized rim jet configuration to achieve effective flushing performance at lower water volume. We install Toto, American Standard, and Kohler low-flow toilets and advise on model selection based on the drain rough-in configuration (standard 305mm or 315mm rough-in distances), user preference, and budget.

Toilet installation includes the new toilet, a new wax ring, new closet bolts, and new supply line. We set the toilet, confirm no rocking before tightening the closet bolts, seal the toilet base with silicone where required (typically in main-floor bathrooms where a visible gap exists), and confirm zero running and proper flush performance before completing the job.

ADA-compliant (comfort height) toilets — those with a bowl height of 17 to 19 inches compared to the standard 15 to 16 inches — are increasingly requested in Mississauga bathroom renovations for improved accessibility and comfort for taller adults. We install comfort height toilets in the same process as standard toilets and confirm the seat height meets the homeowner’s accessibility requirements before completing the installation.

Toilet Flange Repair & Wax Ring Replacement

A toilet that rocks or moves when sat upon has a broken wax ring seal. The rocking compresses the wax ring differently on each side, creating gaps that allow sewer gas to enter the bathroom and, over time, allow waste water to leak under the toilet onto the subfloor. Rocking toilet repair requires removing the toilet, inspecting the toilet flange for damage, repairing or replacing the flange if required, and installing a new wax ring before resetting the toilet.

Toilet flange repair is required when the original flange is cracked, corroded, or sitting below the finished floor level (which prevents the wax ring from making full contact with the flange surface). We repair flanges using a flange repair kit that mounts over the damaged original or, where the damage is too extensive, replace the full flange section in the drain pipe.

For toilets with a persistently foul odour despite adequate cleaning, the wax ring is typically failing. Sewer gas entering through a compromised wax ring seal is a health concern and should be addressed promptly. The repair requires temporary toilet removal and takes approximately 90 minutes from start to completion.

Toilet flange height relative to the finished floor surface is an important consideration in bathroom renovations where new tile is installed around an existing toilet. When new tile raises the floor level above the existing toilet flange, the flange must be extended upward using a flange extender kit before the toilet is reinstalled. A toilet set on a flange that is below the finished floor surface cannot form an adequate wax ring seal regardless of the wax ring thickness used.

Toilet Service Area & Licensed Plumbers

Delex Plumbing provides toilet repair and replacement services across all Mississauga neighbourhoods. All work is performed by licensed master plumbers with Ontario College of Trades certification and full liability insurance. Every toilet repair and installation carries a written labour warranty.

For a toilet that is overflowing and cannot be stopped, call our emergency plumbing line at 416-910-2550 immediately. Close the shut-off valve at the base of the toilet to stop water flow while waiting for the plumber. If the shut-off valve is seized and will not close, call us and our dispatcher will walk you through locating and closing the main water shut-off. Our complete bathroom plumbing team handles every fixture in your bathroom — showers, sinks, faucets, and bathtubs all under one flat-rate quote.

Free Estimate — Call 416-910-2550

Every toilet plumbing job starts with a free estimate. Call 416-910-2550, contact us online, or request service

Frequently Asked Questions

Q: How much does running toilet repair cost in Mississauga?

A: Fill valve and flapper replacement (complete tank rebuild) costs $100 to $200 including parts and labour. Flapper-only replacement costs $60 to $100. For a toilet that needs replacement, supply-and-install of a standard low-flow toilet costs $350 to $700. Call 416-910-2550 for a free estimate.

Q: Is a running toilet an emergency?

A: A running toilet is not an emergency in the same sense as a burst pipe, but it does waste significant water and should be repaired promptly. 200 litres of water per day is the typical waste rate for a continuously running toilet. Same-day service is available for running toilet repair when you call before 10 a.m.

Q: My toilet is making a loud hissing sound. What is it?

A: A hissing sound from the toilet tank is almost always the fill valve not seating properly after a flush — water is continuously trickling in past a worn valve seal. This is the same problem as a running toilet and is resolved with fill valve replacement. Call 416-910-2550 for same-day repair.

Q: How often should a toilet wax ring be replaced?

A: A wax ring should last the life of the toilet (20 to 30 years) under normal conditions. Signs it needs replacement: the toilet rocks or moves, sewer gas odour in the bathroom, water staining around the toilet base, or water appearing under the toilet after flushing. Any of these symptoms warrants a service call.

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