Smoke Testing

Ssmoke-testing-pic-1-Custommoke testing is a common method for utilities to find leaks or breaks in sewer mains.

During testing, smoke-filled air is forced into the sanitary sewer system. As the smoke flows through the sewer mains, it will leak out of any defects in the pipe and escape through the ground. This allows crews to pinpoint sewer breaks that are in need of repair.

Before CFPUA crews conduct smoke testing in your neighborhood, we will hand-deliver notification to your property and post an alert on the homepage of our website and on our social media channels. 

Frequently Asked Questions

How does smoke testing work? 

Crews use a special device to force smoke into the sanitary sewer system through manholes. Smoke under pressure will fill the sewer main and any sewer connections.

If there is a leak in the sewer main, the smoke will follow the path of the leak up through the surface of the ground, allowing crews to spot the problem. Once testing is complete, the smoke will quickly dissipate. Smoke Test cartoon

Why is smoke testing used?

Smoke testing is an efficient and cost-effective method for finding leaks in the sanitary sewer system. It is used by utilities nationwide to identify potential leaks and breaks without having to hand-dig to sewer lines. 

Is the smoke dangerous?

No, the smoke used for testing is non-toxic, does not leave a residue, and does not pose a fire hazard. 

Customers may notice a distinctive odor outside from the smoke, which will quickly dissipate once testing is complete. 

What can I expect during smoke testing? 

During testing, you may see smoke coming from manholes, vents, spots in the ground, and other locations. The smoke has a white/grey color. CFPUA crews will be documenting the places where smoke escapes during the testing process.

You may also see smoke coming from the roof vent of your home or business. This does not indicate a problem with your property; it simply indicates that your property is connected to the public sewer system.

Before testing begins, CFPUA will be alerting the fire departments that serve your neighborhood so that they are aware of the potential for smoke in the area. 

What if I see smoke inside my home during testing? 

In rare circumstances, smoke may enter a home or business during the testing process. This may indicate an issue with the private plumbing on your property, including: 

  • Vents connected to your private sewer pipe are damaged or improperly installed;
  • Traps under sinks, tubs, showers, and other fixtures inside your property are dried out, damaged, or missing;
  • Pipe connections or seals of the drain system inside and under your building are damaged or improperly installed.