See source link for details. If you need further information about the Household Hazardous Waste Products Collection Events, please contact the Watertown Health Department at (617) 972-6446.  If you are unable to attend one of the posted events, you may attend pay-as-you-go events held at the Clean Harbors Facility in Braintree. Contact them directly at (781) 380-7100 for available dates and times.