Why is my Calgary toilet running constantly?

A toilet that runs continuously or intermittently (phantom flush) has one of three problems: (1) Failed flapper — the rubber flap at the bottom of the tank seal is degraded, warped, or has mineral scale on the seat, allowing water to leak past into the bowl. In Calgary's moderately hard water (170–200 mg/L), mineral deposits on the flapper seat are a common failure cause. (2) Fill valve failure — the fill valve does not shut off properly after a flush, allowing water to overflow into the overflow tube and run into the bowl. (3) Float set too high — the water level is above the overflow tube, causing continuous drainage into the bowl.

How much water does a running Calgary toilet waste?

A continuously running toilet wastes between 750 and 2,800 litres of water per day depending on the severity of the leak. At Calgary Water's residential rate (approximately $1.92 per cubic metre in 2026), a toilet running at 1,000 litres per day costs approximately $57 per month in water alone — plus wastewater charges at a similar rate. A minor flapper leak that only runs when the toilet has just been flushed wastes less — typically 100 to 400 litres per day — but still adds $6 to $23 per month. The repair cost (flapper: $8 to $15; fill valve: $18 to $35; handyman labour: $55 to $95) pays for itself in 1 to 2 months.

How do I diagnose a running toilet myself in Calgary?

Two-step diagnosis: (1) Food colouring test — add a few drops of food colouring into the toilet tank. Wait 15 minutes without flushing. If colour appears in the bowl, water is leaking past the flapper (flapper failure or flapper seat scale). (2) Float check — remove the tank lid and observe where the water level sits. The water should be approximately 2.5cm (1 inch) below the top of the overflow tube. If water is flowing into the overflow tube continuously, the float is set too high or the fill valve is not shutting off. Adjust the float arm downward (bend it toward the water) or adjust the float adjustment screw on ballcock-style fill valves.

Can a handyman fix a running toilet in Calgary or do I need a plumber?

A handyman can repair a running toilet that requires standard tank component replacement — flapper, fill valve, flush valve, flapper seat cleaning, float adjustment, or the full flush tower assembly. A licensed plumber is required for: work on the water supply line behind the wall, replacing the angle stop shut-off valve on the supply line (if the old one is stuck and cannot be closed for tank work), and any toilet drain or rough-in modifications. Most running toilet problems are tank component failures and are entirely within handyman scope.

How much does running toilet repair cost in Calgary?

Flapper replacement (handyman supplied, includes diagnosis): from $55. Fill valve replacement (handyman supplied): from $75. Complete tank rebuild (flapper, fill valve, flush valve, handle — all new): from $115. These prices include parts and labour for a standard residential toilet in Calgary. If the angle stop (shut-off valve under the toilet) is seized and cannot be closed, the main water supply to the house must be shut off during repair — this adds time but is not a separate charge.

Running Toilet Calgary — Causes, Fix & Cost

How to diagnose the cause of a running toilet

Remove the tank lid. Here is what to look for:

What you observe	Likely cause	Fix
Water overflowing into overflow tube	Float too high or fill valve not closing	Adjust float or replace fill valve
Water level normal; running sound (food colouring test positive)	Flapper leaking	Replace flapper
Water level normal; fill valve running intermittently	Fill valve not seating	Replace fill valve
Handle jiggles to stop running	Flapper chain too long / tangled	Shorten chain
Hissing sound from fill valve area	Fill valve seat worn	Replace fill valve
Running only after flush, then stops	Flapper slow to seat	Clean flapper seat, adjust chain length

Calgary hard water and flapper failure

Calgary's moderately hard water (170 to 200 mg/L total dissolved solids) causes mineral scale to build up on toilet flapper seats over time. The scale creates an uneven seating surface that the flapper cannot seal against. This is a common reason for a running toilet in Calgary homes that appear to have new flappers — the flapper itself is fine, but the valve seat it closes against has scale deposits.

Fix: turn off the water supply (angle stop under the toilet), flush to empty the tank, and clean the flapper seat with white vinegar and a scrubbing pad. Mineral deposits will dissolve in the acidic vinegar solution. Allow to dry, turn the water back on, and test. If this does not stop the running, replace the flapper.

Tank components: what they cost at Calgary hardware stores

Part	Part cost	Notes
Flapper (universal)	$8–$15	Korky or Fluidmaster; fits most Calgary toilets
Fill valve (Fluidmaster 400A)	$18–$25	Universal fit; standard replacement
Float ball (older toilets)	$8–$12	For ballcock-style fill valves in older homes
Toilet handle/lever	$12–$25	Matches if chrome vs. matte vs. brushed nickel
Complete repair kit (flapper + fill valve + handle)	$25–$45	Fluidmaster 400AK or equivalent
Flush valve + flapper (complete flush tower)	$35–$65	If flush valve seat is cracked or warped

Running toilet repair pricing in Calgary

Scope	Starting price
Flapper replacement (handyman supplied)	From $55
Fill valve replacement (handyman supplied)	From $75
Complete tank rebuild (flapper + fill valve + handle)	From $115
Flapper seat cleaning (mineral scale)	From $45
Float adjustment (no parts needed)	From $45 (min call)

Running toilet repair in Calgary

Most running toilet repairs are diagnosed and fixed in one visit — same or next day. Tell us which toilet, where in the city, and whether you have noticed any water damage near the base.

View toilet repair service →Request a toilet repair quote

Steve serves all Calgary areas