Residents in parts of Grants Pass will see another round of sewer smoke testing this week as city crews continue efforts to inspect and maintain the underground wastewater system. The testing is scheduled for Wednesday, October 29, 2025, between 7:30 a.m. and 3:00 p.m., covering the area between 9th and 10th Streets, beginning at Wharton Street and moving north to include a small portion of Northeast Josephine and up to Northeast Cedar.
Smoke testing is a common and cost-effective method used by public works departments to locate cracks, breaks, or other defects in sewer lines and private laterals. By identifying weak points early, the city can prevent groundwater infiltration, reduce system overload during heavy rains, and minimize the risk of sewage leaks or backups. The process involves blowing harmless smoke into the sewer system under controlled pressure to reveal any points where the system may be compromised.
During the test, residents may notice small amounts of smoke rising from roof vent stacks, ground cracks, or maintenance holes. City officials emphasize that the smoke used in the process is completely safe, non-toxic, non-staining, and dissipates within minutes. It does not pose a fire hazard and is similar to the type of smoke used in theatrical effects.
Homeowners are advised to prepare before the test by pouring a small amount of water into floor drains, basement drains, and any unused sinks. Doing so ensures that drain traps are filled, preventing smoke from entering homes or buildings through dry plumbing lines.
If smoke does enter a home, it could indicate a plumbing defect or disconnected pipe that might also allow harmful sewer gases to escape. In such cases, residents should ventilate the area immediately by opening doors and windows and contact city inspectors to schedule a follow-up assessment.
City staff are distributing informational notices to all homes and businesses in the testing zone before the procedure begins. These notices explain the testing process, provide contact details, and offer guidance for anyone who may have concerns. Residents with confined pets, elderly family members, or individuals with respiratory issues are encouraged to notify the city ahead of time to help minimize stress or confusion during the test period.
While smoke testing can briefly draw public attention when visible plumes appear from the ground or rooftops, the procedure is one of the most effective tools available for ensuring the long-term reliability of the city’s sewer infrastructure. By locating defects early, the city can prioritize repairs, improve system efficiency, and protect the community from costly future failures.
For more information or to report any issues related to the upcoming smoke test, residents may contact the Grants Pass Public Works Department at 541-450-6115. The department reminds residents that this is one of several smoke tests being conducted citywide as part of ongoing maintenance and modernization of the municipal sewer system.