Smoke Testing

During smoke testing, crews blow air and smoke into the sewer system through manholes. The smoke fills the main sewer pipe and any connected pipes, and follows the path of any leak to the ground surface. Crews monitor where smoke escapes the system to find the leaks.

Smoke testing is the most efficient and cost-effective way to find leaks and areas that need improvement in the sewer system. It also helps to identify plumbing leaks that may allow harmful sewer gases to enter buildings.

In addition, smoke testing helps to find where storm water and other surface water gets into the sewer system. Keeping unnecessary water out of sewers makes treating our wastewater more efficient and cost-effective.

No. The "smoke" is not true smoke. It is a harmless white vapour which is safe for humans, animals and plants. It leaves no residue or stains, is not a fire hazard, and will disappear rapidly without leaving an odour.

Since any vapour can be an irritant, direct contact with the smoke may cause minor respiratory irritation in some people. People with respiratory problems such as chronic asthma or emphysema should avoid direct exposure to the smoke. Please contact the council to discuss your situation further if you have concerns about upcoming smoke testing.

If smoke enters your home during the test, there may be problems with your plumbing, we recommend you contact your plumber immediately.

If you have any doubt as to the source of the smoke in your home or property and suspect a fire, please call 111 immediately.

Because your plumbing is connected to the sewers, smoke may enter your home or workplace if:

• Vents connected to your building's sewer pipes are inadequate, defective, or improperly installed
• Traps under sinks, tubs, basins, showers and other drains are dry, defective, improperly installed, or missing
• Pipes, connections and seals of the wastewater drain system in and under your buildings are damaged, defective, have plugs missing, or are improperly installed.

• Do not be alarmed.
• Open windows to allow ventilation and note where the smoke is coming from; it will clear in a few minutes.
• Leave your home and notify smoke testing personnel in the area. This is precautionary until we confirm that the smoke is from our testing and is not indicative of fire.
• If smoke enters your home during the test, there may be problems with your plumbing. These problems could allow potentially dangerous sewer gas to enter. Please contact your plumber immediately.

If you have any doubt as to the source of the smoke in your home or property and suspect a fire, please call 111.

Smoke testing focuses on the public part of the sewer system, which Council maintains. While the test also helps to identify plumbing problems on private property, this is not the main intent of the smoke test. It is the homeowner’s responsibility to maintain private plumbing connections. Please contact your plumber if you have any concerns about plumbing on your property.

We can’t do smoke testing when it’s rainy or very windy, so the weather can sometimes cause delays. Also, other activities in the project may take less time than expected, so it can sometimes be sooner than expected. However, we will let you know the period in which we will be smoke testing your area by mail.

Yes, smoke alarms may be activated during smoke testing. If possible, open windows and/or doors for ventilation. If you have any doubts about the origin of the smoke, call 111.

No need to worry, the smoke is a vapour and cannot plug the sewer.

Smoke will be seen coming from roof vents on homes. This is normal and indicates that smoke has filled the sewers. Smoke may be seen coming from building foundations, manhole covers, or yard cleanouts.

Council will use the findings to help plan future public infrastructure improvement projects and to identify changes required to stop storm water and other surface water from getting into the sanitary sewer system. Depending on the findings, we may also undertake immediate repairs to the sewer system.