Dry traps
Every drain has a trap, a bend that holds the water to block gas from the sewer. If a drain is not used, the water evaporates. Basement floor drains, guest bathroom showers and laundry tubs are common offenders. Pour water into each one. If the smell fades within an hour, you found it. See floor drain cleaning.
Toilet wax ring
A failed seal under a toilet lets gas into the room, often with a faint smell around the base. Rocking toilets are prime suspects. Replacing the seal fixes it. See toilet repair.
Vent problems
Plumbing vents carry sewer gas up and out through the roof. If a vent is blocked by a bird's nest, ice or debris, gas can be pushed out through traps instead. Signs include gurgling drains and smells when other fixtures drain. Air admittance valves under island sinks can also fail and let gas leak.
Standing over the problem right now?Ring (365) 364-0926 and describe what you see.
Cracked or loose pipes
A crack in a cast-iron stack, a loose cleanout plug, or a disconnected drain in a wall can all leak gas. This is more likely in older homes. A smoke test, which puts harmless smoke into the drain system, shows where it escapes.
Sump pits and backwater valves
An unsealed sump lid can let soil gas in. A backwater valve cover that was not resealed after cleaning can leak sewer gas. Check both.
When to call
If topping up the traps does not help, if the smell keeps returning, or if drains are also gurgling or slow, call. A smell often points to a problem that is cheaper to fix now. See also backwater valve maintenance.
Questions from callers
Should a sewer smell worry me?
In small amounts it is largely unpleasant. Strong or persistent smells should be investigated.
Why does it smell only sometimes?
Wind, drain use and weather affect venting and trap levels.
What is a smoke test?
Harmless smoke is blown into the drains to show where gas escapes.
Ready when you are.Call Vaughan Plumbers at (365) 364-0926. A person answers.