Come Tuesday, expect to see a bit of smoke rising between Snelling Avenue and Rice Street.

St. Paul’s Sewer Department will be testing sewer systems north of University Avenue from Snelling to Rice Street beginning Tuesday through the end of October. The simulated smoke injection aims to find faulty connections and leaks that may need repair. The tests last about 30 minutes at each location.

The city owns and maintains approximately 804 miles of sanitary sewer and 450 miles of storm sewer in public streets, alleys or easements, some of it dating to 1887. Related Articles St. Paul PD highlights surveillance photos of looting suspects, seeks tips

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The smoke rises from manhole covers, storm drains, roof vents and building foundations.

In a statement, city sewer engineer Aaron Hass said the smoke is safe and is not likely to enter homes unless they have a plumbing problem or fixture traps lack water. If it does enter a residence or business, open doors and windows to ventilate the space and call the sewer safety testing crew at 651-238-0572.

For more information, visit stpaul.gov/sewertesting or call 651-238-0578. St. Paul Public Works posts updates to Twitter at @stpaulpublicw.