In a little less than three months, Washington State’s largest cities and counties must start following new rules on how to manage dirty runoff that washes toxic metals, oil and grease, fertilizers, and other pollution into our streams, lakes, and ocean. Polluted stormwater is one of the largest threats to Puget Sound, so it’s worth taking some time to demystify just what will be required.
The updated rules of the road are contained in the state’s new Municipal Stormwater Permits, which are administered by the Washington Department of Ecology. The permits cover everything from reducing construction pollution to educating citizens on good stormwater practices as they wash cars to adopting green low-impact development techniques like roadside rain gardens, permeable pavement, and green roofs.
In this blogpost, we’ll focus on updates to the Phase I permits, which go into effect on August 1, 2013 and will remain in force for five years. The permits cover discharges from large and medium municipal separate storm sewer systems, commonly known as “MS4s,” found in the most populated areas of the state. (We’ll get into the details of the Phase II permits for smaller municipalities in a subsequent post). Read more »











