Sanitary Sewer Smoke Testing Taking Place Starting Week of July 12

Work expected to last through September, weather permitting

In an effort to detect sanitary sewer line defects, the City will be performing smoke testing of various Naperville neighborhoods beginning the week of July 12. Testing is scheduled to last through September, pending weather or unforeseen circumstances.

Smoke testing is a way to locate openings in the sewer system that allow rainwater runoff to enter City's sanitary sewer system. Air combined with non-toxic smoke is forced into the sewer lines to disclose the location of leaks and connections to storm water systems. Smoke can be seen coming up out of the ground where there are defects in the lines. Smoke testing helps prevent inconvenient and expensive sanitary sewer backups, and identifies roof drains, patio drains and footing drains that are connected to the sewer system.

The smoke is non-toxic, creates no fire hazard, leaves no residue, dissipates quickly and is harmless, although those with respiratory issues may wish to take extra precautions such as leaving the home for a few hours until testing is complete. Smoke will not enter buildings unless there is defective plumbing or drain traps that are dried up, and it is expected – and normal – for smoke to come out of the sewer vent stack on the roof of a home or business during the test. Door hanger notification cards are being distributed to those impacted immediately prior to testing, and the public can expect to see signs posted at intersections when crews are testing in that area.

For more information on sanitary sewer line smoke testing and a map of the impacted area, visit

About Naperville: Located 28 miles west of Chicago, Naperville, Ill., is home to approximately 145,000 people. This vibrant, thriving city consistently ranks as a top community in the nation in which to live, raise children and retire. The city is home to acclaimed public and parochial schools, the best public library system in the country, an array of healthcare options and an exceptionally low crime rate. Naperville has ready access to a variety of public transportation, housing and employment options. The city’s diversified employer base features high technology firms, retailers and factories, as well as small and home-based businesses. Residents also enjoy world-class parks, diverse worship options, the opportunity to serve on several City boards and commissions, a thriving downtown shopping and dining area, a renowned outdoor history museum known as Naper Settlement and an active civic community. For more information, please visit our website at