Sewer Smoke Test

What is a Sewer Smoke Test? 

A sewer smoke test consists of a non-toxic, odorless, and harmless smoke (similar to the smoke seen at various concert events) to locate any leaks or defects in a sanitary sewer system; smoke is pumped into the pipelines and helps identify any improper private connections into the City's sewer system (LBU Rules and Regulations; Section 1401 Discharges Prohibited). In addition to locating leaks, sewer smoke testing prevents system overloading in the event that stormwater enters the sanitary sewer system. If stormwater enters the sewer system, stormwater will overcrowd the pipe's capacity to carry wastewater causing potential sewage backups and increase the cost of wastewater treatment. Sewer smoke testing is an important step to maintain the City's sanitary sewer system. 

Kicking off in late spring 2025, Long Beach Utilities Department (LBUD) and its contractor, Downstream Services, Inc., will conduct specialized testing of its sewer system through smoke testing. This smoke testing is designed to help prevent overflows, protect the structural integrity, and maintain the city's sewer system.

How to Best Prepare

If you receive a notification or doorhanger for an upcoming sewer smoke test, LBUD and its contractor request the following assistance from customers to best prepare for a sewer smoke test in your neighborhood:

  • Pour one total gallon of water in all drains the day-of the test.

  • Long Beach Fire Department and Police Department are informed about the sewer smoke testing in your area. If you have any questions, please contact us at 562-570-2390. 

  • The Sewer Smoke Test will last approximately one hour. 

  • If you detect smoke in your residence/business, please notify the field technicians conducting the smoke testing. 

---

Thank you for your cooperation as we work to successfully complete this important maintenance project. 

Frequently Asked Questions

Is the smoke harmful?

No, the smoke used in sewer testing is considered non-toxic and safe to breathe. The smoke used for this test is similar to the smoke used at events or concerts.

What is the reason for smoke testing?

Smoke testing is used to find potential leaks or cracks in the sewer system to help up ensure the proper maintenance of our infrastructure.

Why might smoke come into my house?

If smoke enters your home, it usually indicates a problem with your sewer line connections or plumbing vent.

What should I do if smoke enters my home?

If you notice smoke entering your home during a smoke test, immediately contact the testing company and your plumber to address the issue.

How long will the smoke test take?

A typical smoke test for a single property can take anywhere from 30 minutes to an hour, depending on the complexity of the plumbing system.

What does it mean if smoke is coming from a specific location?

If smoke is visible coming from a specific area outside, it indicates a potential leak in the sewer line at that spot.

Who should I contact if I see smoke issues?

If you observe smoke during a smoke test, contact LBUD at 562-570-2390 to discuss any potential problems.

Back to top