All utility owners (gas, water, telephone, etc.) are required by State law to mark their underground facilities in advance of excavation activity to prevent accidental damage from construction or trenching machinery. Hitting gas or other utilities can be very hazardous to workers or anyone in the area. Paint marks are color-coded Yellow for gas, Red for power, Blue for water, Orange for telephone, and so on. For more information visit the Utility Notification Center. For more information, please call Public Works at 425-831-4919.