Summary: Tariff revisions to pass through the King County Hazardous Waste Tax. On January 1, 2020, the King County Board of Health is increasing the Local Hazardous Waste Management Plan fee by 5.5 percent, or $0.05 per month for single family customers. South Sound/Seattle business unit serves approximately 17,700 garbage and recycling customers in King County. The company’s last general rate case became effective June 1, 2014.