Running Toilet and a High Water Bill in Concord

Published 2026 — Rhodex

A toilet that keeps running is the most common reason for a surprise water bill in Vaughan. Run a dye test, replace the worn flapper or fill valve, then ask the City about its one-time leak adjustment.

Your Alectra water bill jumps, nobody has had a long guest stay, and nothing is visibly dripping. In most Concord homes the culprit is the toilet. The City of Vaughan says toilet leaks are the most common cause of high water and wastewater bills, and the reason is simple: water slipping past a worn flapper into the bowl makes almost no noise, so it can run for weeks.

Step one: confirm it is the toilet

The City publishes two checks you can do yourself in under an hour. For the toilet, drop a dye tablet or about five drops of food colouring into the tank, put the lid back on, and don't flush for about 30 minutes. If colour shows up in the bowl, water is leaking out of the tank.

For the rest of the house, compare your water meter reading before bed and again in the morning, with nothing running overnight. If the number moved, water is passing through the meter somewhere. A toilet is the first suspect, but a dripping tap, a hose bib or a leak in a pipe can show up the same way. Test every toilet in the house, because a bill that doubled rarely comes from the one you flush most.

Step two: what usually needs fixing

Inside the tank there are two parts that fail most often, and both are small plumbing jobs:

The flapper is the rubber seal at the bottom of the tank. When it hardens, warps or collects mineral build-up, it stops sealing and water trickles into the bowl. That is exactly what the dye test catches.
The fill valve refills the tank after a flush. If it won't shut off, water rises to the overflow tube and runs down it. You will hear a faint hiss or see the tank water sitting right at the tube's top.

Replacement parts are widely sold and are not expensive, and a tradesperson can usually swap either in a single short visit. Labour for a small plumbing visit like this is quoted separately from parts, so ask for the labour figure "plus materials and HST" in writing. Our Concord toilet repair cost guide explains what moves that number, including access in a condo tower.

Step three: ask Vaughan about the leak adjustment

Vaughan has a corporate policy (12.C.13) that lets an eligible customer ask for an adjustment to water and wastewater charges after an accidental leak is repaired on the customer's side of the meter. Based on the City's published policy and request pages, the main conditions are:

Your water use must have been more than two times (200 per cent) the average consumption from the previous year.
The account must be in good standing.
All leaks must be repaired and verified before an adjustment is made.
You apply online within 120 calendar days after the date of the final repair. Miss that window and the opportunity is waived.
It is meant as one-time help: a customer who has received an adjustment before is not eligible.
Leaks in the water service pipe are excluded, and income-producing residential rental properties, along with institutional, commercial and industrial properties, are not eligible.

Two practical points. First, keep the plumber's receipt or invoice, because it dates the final repair and your 120 days run from that date. Second, the City advises paying the bill in full within the normal payment period (or arranging a payment plan) while the request is reviewed, because any reimbursement comes only if the request is granted. The City's pages are the authority and policies get updated, so read the current policy and request form on vaughan.ca before you apply. The City's water leak desk is ES.waterleak@vaughan.ca, and Alectra Utilities (1-833-253-2872) handles questions about your account itself.

When the toilet is not the only problem

If the dye test is clean and the meter still moves, stop guessing. A leak on the house side of the water service, a failing valve or a slow drip in a wall needs a proper look. If you see damp drywall or a stained ceiling, fix the source first and then call for the wall or ceiling repair.

Quick answers

How do I test a toilet for a leak?

Put a dye tablet or about five drops of food colouring in the tank, keep the lid on, and don't flush for roughly 30 minutes. Colour in the bowl means water is leaking past the flapper.

Is a running toilet really the most common cause of a high water bill?

Yes, according to the City of Vaughan, toilet leaks are the most common cause of high water and wastewater bills. A toilet can leak silently for weeks because the water slips past the flapper without any sound.

Will Vaughan reduce my bill after I fix a toilet leak?

Possibly, once. The City's policy can adjust a bill if your use was more than double last year's average and the account is in good standing. You must apply online within 120 days of the final repair.

Is a flapper replacement a big job?

No, a flapper or fill valve swap is a small plumbing job, usually done in one short visit. The harder part is confirming the toilet is the only leak before you apply for any adjustment.

Who do I call about the water bill itself?

Alectra Utilities handles the account, and the City points account questions to Alectra at 1-833-253-2872. Rhodex can send a craftsman for the repair: https://rhodex.ca/get-a-quote.html?from=running-toilet-high-water-bill-concord

Fix it once, then check the next bill

After the repair, repeat the dye test and the overnight meter check so you know the fix held, and write down the repair date. Then watch the next bill. A flapper that cost very little to replace is usually far cheaper than another cycle of inflated water charges.

Not sure what's actually going on?

Every home is different, and home repair or renovation problems don't always match the textbook case. Describe your specific situation to Rhodex's AI Advisor and get a straight, honest answer — free, no obligation.

Ask the AI Advisor about your home repair or renovation question →

A Running Toilet Behind a High Water Bill in Concord