Poisons in Puget Sound: where they come from
Thursday, April 23rd, 2009When it rains in Seattle (as it often does) water flows along city streets and sidewalks, picking up toxins, before it is sent to a storm drain and eventually ends up in Puget Sound. This is the largest polluter of the Sound, sending 52 million pounds of pollutants into it every year. That’s a conservative estimate but it’s nothing new.
What is new is a map, produced by a team of GIS students from the University of Washington that shows where the storm drains - that send the water into Puget Sound - are. Turns out there are 4,500 public manmade storm drains, according to the team. The map was produced for People for Puget Sound, a nonprofit that advocates for healthy policies for the sound. The map also includes 2,123 natural drainages that receive inputs from the watershed system of additional drains, and 297 storm drains from the Washington State Department of Transportaion and 70 bridges. Industrial and private drains were not included in the project.
What poisons end up in the sound? Yummy things like copper, zinc, mercury, flame retardants, PAHs, and petroleum hydrocarbons. Some of these pollutants, like phthalates, which are found in plastic bottles and packaging, get dissolved in stormwater, making them hard to remove, if not impossible. Pleasant.
Why should we care? Because, on a very base level, the Puget Sound is a huge economic driver that helps support our local economy. Not to mention the environmental aspects.
So what does the image look like? Here it is…
Bruce Wishart, policy director for People for Puget Sound, said the map shows the enormity of the stormwater problem which impacts the sound.
Heather Trim, urban bays and toxics program manager for the organization, said the students went well beyond their class project to create a terrific map that advances knowledge of stormwater inputs. “We have been told by agencies that it would be years before we could get this map and yet the students have produced this tremendous resource.”
How about it readers, is this image a tad surprising? Or is it what you would have expected?

