{"id":34426,"date":"2026-09-11T06:46:35","date_gmt":"2026-09-11T13:46:35","guid":{"rendered":"https:\/\/www.uwb.edu\/news\/?p=34426"},"modified":"2026-09-11T09:04:16","modified_gmt":"2026-09-11T16:04:16","slug":"taking-the-contaminants-out-of-stormwater","status":"publish","type":"post","link":"https:\/\/www.uwb.edu\/news\/2026\/09\/11\/taking-the-contaminants-out-of-stormwater","title":{"rendered":"Taking the contaminants out of stormwater"},"content":{"rendered":"\n<p class=\"has-drop-cap\">Pollution is one of the biggest threats to aquatic environments and the wildlife that depend on them. Most pollution starts on land and enters the watershed not through large-volume spills but by accumulating from numerous sources and then spilling into the ecosystem through runoff. <\/p>\n\n\n\n<p>Scientists had been working to mitigate the problem of runoff for decades when a new contaminant was found lurking in aquatic ecosystems: 6PPD-quinone.<\/p>\n\n\n\n<p>In 2020, a team of researchers from the University of Washington and Washington State University discovered 6PPDQ, a chemical that is formed when 6PPD \u2014 a chemical used to prevent degradation in automobile tires \u2014 reacts with ozone in the air. They also found that the toxin is deadly to certain species and causes rapid death, for example, in coho salmon swimming in urban streams. <\/p>\n\n\n\n<p>Because salmon are a \u201ckeystone\u201d species that has a disproportionately large effect on its natural environment, this impact can have devastating effects that cascade across entire ecosystems and have the potential to bioaccumulate in marine food webs. Bioaccumulation occurs when a living organism absorbs a substance, such as a chemical or pesticide, faster than it can get rid of it. <\/p>\n\n\n\n<p>Enter Dr. Lizbeth Seebacher, a senior research scientist at UW Bothell, who in her latest research has developed a new media for floating treatment wetlands \u2014 artificial platforms that create wetlands where there are none to aid in filtration \u2014 to mitigate the impacts of 6PPDQ. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Ideas for a solution<\/strong> <\/h2>\n\n\n\n<p>An ecologist, Seebacher consults on wetlands, ecological restoration, stormwater treatment and lake restoration projects. She first became interested in the topic of biomedia for pollution remediation while serving as program manager for aquatic invasive plant and cyanobacteria at Washington state\u2019s Department of Ecology. <\/p>\n\n\n\n<figure class=\"wp-block-image alignright size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"434\" height=\"504\" src=\"https:\/\/www.uwb.edu\/news\/wp-content\/uploads\/sites\/4\/2026\/09\/Screenshot-2026-09-09-at-5.35.27-PM.png\" alt=\"A person.\" class=\"wp-image-34429\" style=\"width:300px\" srcset=\"https:\/\/www.uwb.edu\/news\/wp-content\/uploads\/sites\/4\/2026\/09\/Screenshot-2026-09-09-at-5.35.27-PM.png 434w, https:\/\/www.uwb.edu\/news\/wp-content\/uploads\/sites\/4\/2026\/09\/Screenshot-2026-09-09-at-5.35.27-PM-258x300.png 258w\" sizes=\"auto, (max-width: 434px) 100vw, 434px\" \/><figcaption class=\"wp-element-caption\">Dr. Lizbeth Seebacher<\/figcaption><\/figure>\n\n\n\n<p>She heard about its success rate while at a fisheries conference in 2016 where presenters reported a 100% survival rate in coho salmon spawned in stormwater that had passed through biomedia, or porous materials that filter toxins. And in the untreated water? 100% mortality. <\/p>\n\n\n\n<p>\u201cA lot of us in the room were like, \u201cmouth drop,\u2019\u201d Seebacher said. \u201cIt was great, but my next thought was, \u2018How are we going to get this biomedia on the side of the road at every mile?\u2019\u201d <\/p>\n\n\n\n<p>She continued to follow the research. All the while, the wheels in her head kept turning on how to effectively introduce the biomedia. <\/p>\n\n\n\n<p>\u201cAnd then I thought, well, in order to get that biomedia into the water column, what if we tried floating treatment wetlands but with a design that would allow us to place it in the water body at the point of stormwater entry?\u201d <\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>The \u2018teabag\u2019 effect<\/strong> <\/h2>\n\n\n\n<p>Seebacher realized that it wasn\u2019t going to be feasible to attack the problem at <em>every<\/em> point of entry \u2014 adding biomedia infrastructure the full length of a highway would be expensive and labor intensive. Instead, she decided to focus on the areas where she could make the biggest difference: stormwater ponds. <\/p>\n\n\n\n<figure class=\"wp-block-image alignright size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"639\" src=\"https:\/\/www.uwb.edu\/news\/wp-content\/uploads\/sites\/4\/2026\/09\/cropped-IMG_0123-copy-14356bac2b252a62-1024x639.jpg\" alt=\"A floating device in water.\" class=\"wp-image-34431\" style=\"width:600px\" srcset=\"https:\/\/www.uwb.edu\/news\/wp-content\/uploads\/sites\/4\/2026\/09\/cropped-IMG_0123-copy-14356bac2b252a62-1024x639.jpg 1024w, https:\/\/www.uwb.edu\/news\/wp-content\/uploads\/sites\/4\/2026\/09\/cropped-IMG_0123-copy-14356bac2b252a62-300x187.jpg 300w, https:\/\/www.uwb.edu\/news\/wp-content\/uploads\/sites\/4\/2026\/09\/cropped-IMG_0123-copy-14356bac2b252a62-768x479.jpg 768w, https:\/\/www.uwb.edu\/news\/wp-content\/uploads\/sites\/4\/2026\/09\/cropped-IMG_0123-copy-14356bac2b252a62-1200x749.jpg 1200w, https:\/\/www.uwb.edu\/news\/wp-content\/uploads\/sites\/4\/2026\/09\/cropped-IMG_0123-copy-14356bac2b252a62-600x375.jpg 600w, https:\/\/www.uwb.edu\/news\/wp-content\/uploads\/sites\/4\/2026\/09\/cropped-IMG_0123-copy-14356bac2b252a62.jpg 1440w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u201cRoad runoff goes straight down the drain and into whatever the nearest body of water is \u2014 whether it be a creek, a wetland or the Puget Sound,\u201d she said. \u201cBut often, it pools in stormwater ponds on its way there. I hadn\u2019t realized it before, but there really is no treatment going on in stormwater ponds. <\/p>\n\n\n\n<p>\u201cAnd that was a big awakening.\u201d <\/p>\n\n\n\n<p>In 2018, she received a King County Waterworks grant and began experimenting with different biomedia and modules for floating treatment wetlands. What made her project different from others, she said, was that rather than relying on water running through the biomedia \u2014 which can be difficult to achieve in a field environment \u2014 her modules simply sit in the water body to passively filter. <\/p>\n\n\n\n<p>\u201cIt\u2019s a teabag effect,\u201d she said, \u201cand I think it works very well, especially if the design is right and there\u2019s enough biomedia in there and the contact time is long enough.\u201d <\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Student skills in the field<\/strong> <\/h2>\n\n\n\n<p>When the news about 6PPDQ came out in 2020, Seebacher\u2019s focus shifted, and she continued experimenting with different biomedia to see what worked for the toxin. Supporting her in this project were several research assistants. <\/p>\n\n\n\n<p>\u201cThis project really helped me in gaining real-world experience in environmental work,\u201d said Arun Khou, who graduated from UW Bothell in 2021 with a degree in Earth System Science and a minor in Geographic Information Systems. \u201cI honed my skills of data collection and scientific communication with others.\u201d <\/p>\n\n\n\n<p>Brendan McCrindle was a research assistant alongside Khou and began to take on more work after Khou graduated. In the role, he wore many hats, he said, including filling biomedia bags, constructing the modules, installing them in Lake Sammamish and helping to maintain them. The bulk of his work, however, focused on fish use surveys and data collection. <\/p>\n\n\n\n<p>\u201cI think my UW Bothell classes prepared me well for this work,\u201d said McCrindle, a 2025 alumnus from the Earth System Science program. \u201cGetting experience out in the field and getting my hands dirty really prepared me for the problem-solving nature that comes alongside field work. Our field work classes involved setting up monitoring methods and following our plans, and things go wrong, especially when we\u2019re first learning. <\/p>\n\n\n\n<p>\u201cThese kinds of experiences slowly build up the ability and confidence in oneself to be comfortable when things don&#8217;t go quite right,\u201d he said \u201cThat\u2019s the reason I absolutely loved UW Bothell\u2019s field classes \u2014 because there is so much opportunity in them to try things and learn by making mistakes.\u201d <\/p>\n\n\n\n<figure class=\"wp-block-pullquote\"><blockquote><p>&#8220;Getting experience out in the field and getting my hands dirty really prepared me for the problem-solving nature that comes alongside field work.&#8221;<\/p><cite>Brendan McCrindle, Earth System Science \u201925 <\/cite><\/blockquote><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Save the fish<\/strong> <\/h2>\n\n\n\n<p>Through her experiments, Seebacher was able to achieve a 100% survival rate of coho salmon using her modules. But it is not a one-size-fits-all solution, she said. <\/p>\n\n\n\n<p>\u201cIt\u2019s never a good thing to have something so toxic entering the environment. We also don\u2019t know what it\u2019s doing to humans, although they\u2019re finding it in our bodies,\u201d she said. \u201cBut that shouldn\u2019t be the only reason to do something about it. We <em>know<\/em> that it\u2019s killing fish and the first thing we should be doing is banning the substance to get rid of the source. <\/p>\n\n\n\n<p>\u201cThe second,\u201d she said, \u201cis that we need to find remediation methods that work in different situations. <\/p>\n\n\n\n<p>In the meanwhile, she added, \u201cthe state should take this work more seriously and fund these modules so that we can get them out there and treat the stormwater before it kills so many more of these fish.\u201d <\/p>\n","protected":false},"excerpt":{"rendered":"<p>In her latest research, Dr. Lizbeth Seebacher developed a way to help filter out a deadly toxin that kills coho salmon. <\/p>\n","protected":false},"author":121,"featured_media":34427,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_is_archived":false,"_archived_contact_email":"","footnotes":""},"categories":[202,214],"tags":[],"school":[419,421],"class_list":["post-34426","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-campus-news","category-research","school-school-of-ias","school-school-of-stem"],"acf":{"related_links":{"toggle_visibility":false,"link_1":"","link_2":"","link_3":"","link_4":"","link_5":""},"highlight_box":{"toggle_visibility":false,"title":"","content":"","button":"","button_style":"angled-purple-button","button_screen_reader_text":""},"contact_type_1":{"toggle_visibility":true,"contact_title":"","email":"","phone":"","box":"","address_line_1":"","address_line_2":"","location":""},"contact_type_2":{"toggle_visibility":false,"contact_title":"","email":"","phone":"","box":"","address_line_1":"","address_line_2":"","location":""},"social_media":{"toggle_visibility":false,"facebook_url":"","instagram_url":"","linkedin_url":"","twitter_url":"","youtube_url":""},"blog_archive_sidebar_visibility":false},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - 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