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Household hazardous waste drop-off in Boulder County, Colorado

In Boulder County, programs may be called HHW, household chemical waste collection — the listings below use each agency's own name.

2 listings in Boulder, Longmont. A county site may be open only to residents of that county or of member cities.

Call ahead. Hours, fees, residency rules, appointments and accepted materials change. Check the official page or call before you go. Never mix chemicals, and keep products in their original containers. Every listing links to its official source.

Listings in Boulder County

• Boulder County Hazardous Materials Management Facility

  1901 63rd St., Boulder, CO

  • Permanent drop-off
  • Fluorescent bulbs / CFLs
  • Household chemicals & cleaners
  • Used motor oil
  • Antifreeze
  • Paint
  • Pesticides & garden chemicals
  • +1 more

  Hours: Wednesday through Saturday, 8:30 a.m.–4 p.m. Tuesday is reserved for business waste by appointment only.

  Source: Boulder County · checked November 9, 2026

• City of Longmont Household Hazardous Chemical Drop-Off Day

  110 South Martin Street, Longmont, CO

  • Collection event
  • Other household hazardous waste

  Dates: August 21, 2027

  Hours: Saturday, August 21, 2027, 8 a.m.–noon at the Waste Services Center.

  Source: City of Longmont · checked November 9, 2026

More household hazardous waste listings in Colorado