What does HHWD stand for?

Household Hazardous Waste Day (various locations)

This definition appears very rarely and is found in the following Acronym Finder categories:

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Haarlemse Honkbal Week (Netherlands) Hamilton High West Heating Hot Water High High Water (same as HW springs) Household Hazardous Waste (recycling and resource conservation) HTML (Hypertext Markup Language) Help Workshop (Microsoft) Household Hazardous Waste Collection Center Hey Hey What Can I Do? (Led Zeppelin song) Household Hazardous Waste Collection Program Honey House Web Designs		Household Hazardous Waste Element (California, US) Helen Hay Whitney Foundation Higher High Water Interval Higher High Water, Large Tide (water elevation level) High High Water Mark (Oracle Corporation) Hetch Hetchy Water and Power (California) Household Hazardous Waste Project Heat Health Warning System Heating Hot Water Supply (plumbing) Hamilton Halton Watershed Stewardship Program (Ancaster, ON, Canada)