Recent observations and water quality sampling indicate that conditions in Woods Creek have significantly improved, and that the sewage release has stopped.
On November 17, Environmental Services staff visited the site and observed that both the condition of Woods Creek and the base flow from the outfall were markedly cleaner compared to observations made in late October. [October 18 Advisory: Sewage Release to Woods Creek in Southwest Portland] Natural creek flows and recent rainfall appear to have helped flush and dilute the earlier contamination.
Today, staff collected five E. coli samples from Woods Creek and from the outfall in question. Laboratory results show a significant reduction in bacteria levels and a return to baseline conditions in the creek.
Environmental Services discussed these findings with the Oregon Department of Environmental Quality (DEQ). Based on field observations and analytical results:
- The sewage release from the private outfall appears to have stopped.
- E. coli levels in Woods Creek have returned to normal background levels.
- Environmental Services will return to the site within the next few weeks to conduct additional inspections and follow-up water quality sampling to confirm that conditions remain stable.
- DEQ will be following up directly with the responsible party.
Warning signs remain in place for now. Environmental Services is coordinating with Portland Parks and Recreation to determine when it is appropriate to remove the signage and reopen the affected area of the park.
A final update will be issued once follow-up sampling confirms conditions remain safe and signage is removed.
Help prevent sewage releases
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.