Tag: Water quality

Salish Sea Model tracks pollution, currents and climate change

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This article is the latest in a series about computer models and their uses within the Puget Sound ecosystem. Today, we look at the Salish Sea Model, one of several models in the region helping to predict water circulation, water quality and food-web relationships. Read the full series: Where and how the water moves The waters of Puget Sound contain complex chemical mixtures arising from natural and human sources. The waters are blended and pushed around by currents and other physical forces, creating conditions that vary from place to place. […]

The quest continues for a nutrient reduction plan

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The quest continues for a large-scale plan to reduce human sources of nitrogen and improve the health of Puget Sound. This article is part of the Puget Sound Institute’s effort to explore the technical uncertainties related to the science of Puget Sound water quality. The project, jointly funded by King County and PSI, includes online workshops and discussions, along with informational blogs and articles. By Christopher Dunagan Human sources of nitrogen in Puget Sound have been blamed for increasing the intensity of algae blooms, lowering oxygen to critical levels, and […]

Upcoming workshops on tools to evaluate water quality and biological integrity 

An image of brackish water mixing in the Salish Sea as shown by the Salish Sea Model. Image courtesy of the Salish Sea Modeling Center.
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New event: More than 130 researchers, scientists, modelers, and other experts attended our first workshop in July on The Science of Puget Sound Water Quality. The discussion continues with two interrelated workshops focusing on scientific tools for evaluating marine conditions and species health. Join us:  September 29th from 8 – 10 AM PT for Tools to Evaluate Water Quality. Learn about tools and new analyses from monitoring and modeling that help us better understand water quality and potential eutrophication impacts. We will look in particular at increased access to spatial and temporal […]

Ecology, EPA now under the gun to adopt new water quality criteria for aquatic creatures

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Long delays in updating state water-quality standards to protect orcas, fish and other aquatic species appear to have finally caught up with the Washington Department of Ecology and its federal counterpart, the Environmental Protection Agency. In a court ruling this week, U.S. District Judge Marsha Pechman of Seattle found that Ecology has “abdicated its duties” to update certain water-quality standards, as required by the federal Clean Water Act. Meanwhile, she said, EPA has failed to meet its legal oversight obligations to ensure that adequate water-quality standards are protective of aquatic […]

Science during the year of Covid: The Puget Sound Marine Waters Overview

Puget Sound Marine Waters Overview 2020
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While Covid restrictions remain a part of everyday life, a lot has eased since the global quarantines of spring 2020. During that time, the coronavirus effectively shut down scientific fieldwork in Puget Sound, leaving huge gaps in data for most facets of the ecosystem, from orcas to eelgrass. Despite the lockdowns, a new report from the Puget Sound Ecosystem Monitoring Program offers an assessment of marine conditions during 2020 and paints a surprisingly complete picture of the local environment at that time. This is the tenth year that the group […]

Washington’s Water Quality Assessment offers insights into status of pollution

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More than 2,000 segments of streams, lakes and marine waters have been added to the state’s massive list of water-quality data, allowing more Washington residents to take stock of pollution levels near their homes. The latest Water Quality Assessment for Washington waters, released for public review this week, covers 9,279 miles of streams, 434 lakes and 619 square miles of marine waters. One can use the statewide Draft Water Quality Atlas to zoom in on places of interest and review available information on a given water body. This vast database, […]

New sewage-treatment permit would be a step to curbing nitrogen in Puget Sound

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In an effort to stem the flow of excess nitrogen into Puget Sound, Washington Department of Ecology has proposed a new type of permit for some 60 sewage-treatment plants operating throughout the region. The flexible permit, called the Puget Sound Nutrient General Permit, aims to hold nitrogen releases close to or below their current levels at most of the treatment plants while offering plant operators options for how to meet those goals. It’s a temporary solution, because the long-term goal is to make significant cuts in the total amount of […]

Are some streams in Puget Sound getting cleaner?

Benthic invertebrates range in size from those easily seen with the naked eye to those that cannot be spotted without the use of a microscope. Photo: Christopher Dunagan
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Scientists are reporting some potentially good news about the health of Puget Sound’s streams. Ten years of data from 126 stream sites within King County have shown a slight improvement in water quality, according to the county’s Water and Land Resource Division. The study examined the variety of insects and other invertebrates that were collected from stream sediments. Twenty-one percent of the streams showed an increase in sensitive stream bugs in 2019, earning them a higher score on what is known as the Benthic Index of Biotic Integrity, or B-IBI […]

Video: Identifying sources of pollution in the Skagit Valley

Screenshot from video.
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A video produced by the University of Washington Center for Urban Waters shows how chemical tracers can identify sources of pollution affecting shellfish growers in Puget Sound’s Skagit Valley. Fecal coliform pollution is a widespread problem in Puget Sound, resulting in costly beach and shellfish bed closures whenever it is detected. Analytical techniques can now reveal whether polluted water came from humans or livestock, an often contentious issue when cleaning up contaminants. If scientists can find traces of chemicals such as caffeine or cough syrup, they know to look for […]

Puget Sound’s growing nutrient problem

An algae bloom covers a huge section of Lake Erie. Photo courtesy of NASA.
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By Jeff Rice, Puget Sound Institute First there was “The Blob” that fed last year’s massive algae bloom in the Pacific Ocean. Now there is another monster getting our attention. You might call it “The slime that ate Lake Erie.” The incredible images of Lake Erie’s expanding blanket of green show the familiar effect of nutrient pollution. Nutrients such as phosphorous and nitrogen have been flowing into the giant lake primarily from sources like agricultural fertilizer and wastewater. This has led to a 700-square-mile algae slick, alarming officials worried about potential […]

New project searches for contaminants of emerging concern

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PSI research scientist Andy James has been funded by the Environmental Protection Agency’s National Estuary Program to identify contaminants of emerging concern (CECs) in the waters of Puget Sound. There are literally thousands of man-made chemicals known as CECs circulating in local waters, but very little is known about their impacts on wildlife. They are often found in tiny concentrations and can include residuals from pharmaceuticals and personal care products that are flushed through treated wastewater. James’s project will extend through May 2019 and will focus on the non-targeted sampling of […]

Healthy stream, healthy bugs

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Many groups have been formed around the goal of saving salmon, but few people talk about a concerted effort to save microscopic creatures. Whether or not a pro-bug movement catches on, future strategies to save salmon are likely to incorporate ideas for restoring streambound creatures known as benthic invertebrates. Read our latest story in Salish Sea Currents.