The Clean Water Services of Washington County is a public utility who utilize this Resolution to protect the water resources of the Tualatin River Watershed. This comprehensive standard has design specifications for construction, stormwater, erosion control, etc. It has a no visibility requirement for erosion off-site. All erosion and sediment control requirements apply to all activities and uses within the CWS service area, not just construction and development. Permitted activities require an ESC plan that is utilized during all phases of con..