Basement Flooding Plumbing Response in Mississauga

When to call about basement flooding plumbing response

Call as soon as water appears where it should not, whether it is a few centimetres around a floor drain after heavy rain or a steady flow from a split pipe. If water is still coming in from a supply line, close the main shut-off first. Where water reaches outlets, the furnace or the panel, stay on the stairs and away from anything powered.

We are plumbers, not a restoration crew. Drying, removing wet drywall and mould work belong to restoration firms, and your insurer will often send one. Our role is to stop the water source and make sure it does not happen again.

Common causes we find

• Sewer backup: during heavy storms, the municipal sewer surcharges and water rises through the lowest drain. A missing or stuck backwater valve is common.
• Sump failure: a pump that is burnt out, unplugged, or jammed by its float switch.
• Blocked main drain: household water has nowhere to go, so it comes up the floor drain.
• Supply leaks: burst lines, failed washing machine hoses, or older polybutylene fittings giving way. See our poly-b replacement page.
• Foundation seepage: water through cracks, which is a waterproofing matter, but we can tell you whether plumbing is involved.

Our process on the day

1. We confirm the water source has stopped, or stop it.
2. We look at where the water came from: drain, pit, wall, or pipe.
3. Drains are cleared and the main line is checked with a camera if a backup is suspected.
4. Sump pumps are tested by filling the pit, and the discharge line is traced outside.
5. We write up what caused the water and what we did, in plain terms an adjuster can read.

Repair or replace?

A clogged drain is cleared and the job is done. A pump that has failed at an old age is usually replaced rather than repaired. A house that has flooded from sewer backup more than once is a candidate for a backwater valve, and the city has at times offered help toward that; check our note on the flood protection subsidy for how to look up current terms.

Supply pipe failures are judged by the condition of the rest of the system. One pinhole in sound copper gets a repair; brittle old piping throughout may call for a wider plan.

Keeping it from coming back

Each spring, tip a bucket into the sump pit and watch it cycle. Keep the backwater valve cover accessible and look inside it yearly. Trade rubber laundry hoses for braided steel. Find the main valve and give it a test turn.

A silent toilet leak upstairs will not flood a basement, but it does waste water and can mask other problems on your meter. Our note on running toilet fixes covers that. For finding leaks you cannot see, there is our leak detection service.