Sanitary Sewer Smoke Testing
Smoke testing is a way to locate openings in the sewer system that allow rainwater runoff to enter and can cause inconvenient and expensive sanitary sewer backups. Air combined with non-toxic smoke is forced into sewer lines to disclose the location of leaks and connections. Smoke can be seen coming up out of the ground where there are defects in the lines. Smoke testing also identifies roof drains, patio drains and footing drains that are connected to the sewer system.
2023 Locations
Smoke testing for 2023 began the week of June 26 and concluded Sept. 29. The City of Naperville contracted with RJN Group, Inc. of Downers Grove to perform the testing in the following areas.
View a map of the smoke testing area
What to Expect
Smoke will not enter buildings unless there is defective plumbing or dried-up drain traps. It is expected – and normal – for smoke to come out of the sewer vent stack on the roof of a building during the test.
The smoke is non-toxic, creates no fire hazard, leaves no residue, dissipates quickly and is harmless; however, those with respiratory issues may wish to take extra precautions, such as leaving the area for a few hours until testing is complete.
What You May See
- Current Activity
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Sept. 29, 2023: RJN Group completed the 2023 smoke testing program on Friday, Sept. 29.
- Timeline and Location
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Smoke testing began Tuesday, June 27 and concluded Friday, Sept. 29. Testing took place in locations shown on the map.
- What To Do if You See Smoke
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You should always feel free to call 9-1-1 in an emergency. If you believe smoke is entering your home from the smoke testing, simply open a window and the smoke will dissipate quickly. Also notify the crew that is conducting the tests by contacting a member of the crew on the street.
The smoke is non-toxic, creates no fire hazard, leaves no residue, dissipates quickly and is harmless; however, those with respiratory issues may wish to take extra precautions such as leaving the home for a few hours until testing is complete.
- Additional Information
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Read our Smoke Testing Q&A for answers to frequently asked questions about smoke testing studies.
Learn more about our contractors at the RJN Group website.