Wash. Rev. Code § 70.160.075
Smoking is prohibited within a presumptively reasonable minimum distance of twenty-five feet from entrances, exits, windows that open, and ventilation intakes that serve an enclosed area where smoking is prohibited so as to ensure that tobacco smoke does not enter the area through entrances, exits, open windows, or other means. Owners, operators, managers, employers, or other persons who own or control a public place or place of employment may seek to rebut the presumption that twenty-five feet is a reasonable minimum distance by making application to the director of the local health department or district in which the public place or place of employment is located. The presumption will be rebutted if the applicant can show by clear and convincing evidence that, given the unique circumstances presented by the location of entrances, exits, windows that open, ventilation intakes, or other factors, smoke will not infiltrate or reach the entrances, exits, open windows, or ventilation intakes or enter into such public place or place of employment and, therefore, the public health and safety will be adequately protected by a lesser distance.
RCW 70.160.075
Captions not law-2006 c 2 (Initiative Measure No. 901): See note following RCW 70.160.011.