Water rising from a basement floor drain or wastewater backing up into a tub during a storm needs prompt attention. Rain may be part of the story, but the cause could be a blockage, damaged private line, improper connection, or a problem beyond the property. The symptoms alone cannot tell you which.
Coquitlam homeowners can take a few safe steps while arranging help.
What to do first
- Keep people away from wastewater. Avoid direct contact with sewage and keep children and pets out of the affected area.
- Watch for electrical hazards. Do not enter standing water if outlets, appliances, or electrical equipment may be affected. Arrange professional help for unsafe conditions.
- Stop adding water. If using toilets, sinks, showers, or laundry makes the backup worse, pause those activities until the line can be assessed.
- Document the damage. Take photos from a safe location and contact your insurer about coverage and cleanup requirements.
- Call a plumbing professional. An active backup or overflowing wastewater is urgent. Hippo's sewer backup service explains the response available.
The City of Coquitlam advises residents to be aware of electrical hazards during a sewer backup and says homeowners often need a plumbing professional to clear a plugged service. The City also advises contacting the insurer.
Why can wet weather make sewer problems more noticeable?
Metro Vancouver explains that rainwater and groundwater can enter sanitary sewers through cracked pipes, leaky joints, or improperly connected roof and foundation drains. Extra water uses capacity meant for wastewater and can contribute to overflows, especially in the wet fall and winter months.
That does not mean every backup during rain is caused by the public sewer. A local blockage can happen at the same time as a storm. A plumber may need to clear the line and inspect it before identifying the likely source.
What if the backup keeps returning?
A repeat backup deserves diagnosis beyond another temporary clearing. A sewer camera inspection can show accessible portions of a line after flow is restored and help identify visible damage, roots, or recurring obstruction points. See our guide to recurring drain problems for when an inspection is useful.
Keep a record of dates, rainfall conditions, affected fixtures, previous cleaning, and any camera findings. That history helps a professional distinguish a one-time clog from an ongoing issue.
Who should you contact about a possible City-side issue?
Coquitlam says property owners are responsible for sanitary sewer and drainage pipes on their side of the property line. If the problem is determined to be on the City's side, its Engineering and Public Works 24-hour customer service line is 604-927-3500. A plumber can help document what was found on the private line, but responsibility depends on the location and facts of the case.
Need help with a sewer backup?
If wastewater is actively entering your home, call (604) 365-0812. For a recurring problem that is not active right now, request a drainage assessment and describe which fixtures were affected.
Sources: City of Coquitlam sewer backup guidance and Metro Vancouver guidance on rainwater entering sewers.