The cause was a debris blockage in a city sewer main. The blockage was relieved, and the sewage release was stopped at 10:33 pm on Saturday. Crews estimate that 3,300 gallons were released from the maintenance hole.
As a precaution, the public is advised to avoid contact with the Willamette River downstream of NE Davis St or the Kevin J Duckworth Memorial Dock through midnight Tuesday, March 18, because of the possibility of increased bacteria in the water.
Environmental Services will be collecting E. coli samples from the river to assess the impact and may update this advisory accordingly.
Environmental Services reminds the public that most sewage releases are preventable. The most common causes of sewage overflows are pipes clogged with household debris, such as cooking grease that is sent down kitchen drains or wet wipes that are flushed. Both belong in the trash, not down the drain. Tree roots are another common cause.
Environmental Services advises the public to follow these tips to prevent clogs and overflows in homes and businesses and to prevent sewage releases:
- Only flush human waste and toilet paper (wet wipes are NOT flushable).
- Never pour grease down drains: Collect grease, oil, and fat in a can and then into the garbage. Grease that is liquid when poured down drains will become solid once in pipes.
- Don’t put anything down storm drains, which are intended for rainfall only.
If you experience or see a sewer overflow, contact the City’s hotline at any hour of the day at 503-823-1700.
About Environmental Services
Environmental Services - the City of Portland’s sewer and stormwater utility - protects public health and the environment by collecting and recovering resources from the city’s wastewater, managing stormwater, and restoring and protecting Portland’s rivers, streams, and watersheds.