Humboldt County Household Hazardous Waste Day Now every Fri and Sat 9am-1pm! Call 707-441-2005 for more information! (*Please note: the legal limit of transportation of household hazardous waste is 15 gallons or 125 pounds per container size) Humboldt County's Waste Management Authority and Household Hazardous Waste Webpage Humboldt County's Integrated Waste Management Webpage Household Hazardous Waste Information Webpage Humboldt County's Household Hazardous Waste Collection Facility (including free Mercury Thermometer Exchange)