Aquatic plants seen floating on the Willamette River near Sellwood Bridge on Oct. 15, 2023. (Photo by Sheila Thompson) by: John Ross Ferrara. Posted: Oct 19, 2023 / 12:13 PM PDT.

DEQ says the plant has been determined to be mostly water fern (Azolla). “Floating aquatic plants are not toxic,” Mills said. OHA did not request DEQ to sample and test the material.

Because floating aquatic plants are considered nontoxic, the Oregon Department of Environmental Quality did not conduct toxicology tests. In 2023, heavy rain was thought to have dislodged the ...

Most conversations about plants in ponds revolve around how to remove or prevent them from growing there. In these situations ...