Stormwater Poll Finds High Awareness Of Stormwater Pollution In Northwest States By Amelia Templeton • Oct 17, 2012 Residents of the Northwest see urban stormwater runoff as a top source of water pollution, according to a poll commissioned by EarthFix. Stormwater Called The "Single Largest Contributor To Urban Pollution By Ashley Ahearn • Oct 17, 2012 Photo Credit: Ashley Ahearn Human beings are really good at paving stuff. Such as parking lots and roads. Our development patterns have very real effects on water quality. New Stormwater Regulations Promote Low Impact Development By Ashley Ahearn • Aug 1, 2012 Polluted stormwater runoff is the number one threat to clean water in the populated parts of the Northwest. Wednesday, the Washington State Department of Ecology issued new permits to manage the problem.