How to use ClassifyMyWaste and how to interpret the outcome


Note that only registered users have an option to download a report of the assessment as a pdf file. The report will include a list of substances of concern (if any) per hazard property, with a complete list of scientific references and legislative documents used in the assessment. Once you create your account, you also receive an option to view your history of using ClassifyMyWaste and to manage and re-use your own data.


Non-registered users will only see a summarizing conclusion per hazard property on-screen, without specifying the substances of concern in case a hazard property can be displayed by a waste. Therefore consider to create your account to receive a report that will summarize the assessment and provides more insight.

HOW TO USE ClassifyMyWaste

Step 1. Give a name to your waste.

A user have an option to choose a waste category and subcategory or select “Others” if none of the listed categories are applicable.

Step 2. Enter the elemental content in the Classification page. Use the Tab key to move between cells.

  • The elements mentioned in the Classification page are mandatory for performing a reliable worst case analysis. By default, the content of all elements is marked as not measured. The default indication “Not Measured” will disappear once you enter a number for the elemental content for required elements.
  • Enter half of detection limit value or leave a cell blank if an element was measured and was below the detection limit. If the content of an element is not measured and therefore is not known, please keep it as suggested by default.
  • Note that in case some of the mandatory elements are not known, the assessment of some hazard properties (that are affected by these element) cannot be completed. A message “Assessment cannot be completed” will appear in the output file in such case.
    Hint: If known that the element is present but its content is not known, you may try to enter a very low value for this element (half –detection limit), in order to avoid the “Assessment cannot be completed” message. This will give you an indication which hazard properties are affected by that element. However note that this will possibly underestimate the hazard associated with that element in case the latter is present at higher concentrations. For a reliable worst case assessment we strongly recommend to measure the elemental content of all elements listed in the Classification page.
  • The elemental content can be entered as a number in % (using a dot as a decimal separator) or in mg/kg. If the elemental content is available in mg/kg, apply the conversion factor 0.0001 to convert from mg/kg to %: 1mg/kg=0.0001%.
  • In case that entered elemental content in total exceeds 100%, the assessment will be blocked. In such case it is recommended to review the entered elemental content and check for possible high values that make the total sum of the element concentrations higher that 100%.
  • HP 14 (eco-toxic) worst case assessment takes into account all possible substances that according to the harmonized classification, are ascribed eco-toxic hazard. Note that if one of these elements as P, Al, Si, Mg, Br and Sr is entered as “Non measured”, only the HP 14 assessment will be affected and the message “Assessment cannot be completed” will appear. Despite these elements are not known as main contributors to eco-toxic hazard, they are involved in substances that are ascribed eco-toxic hazard. Therefore their absence makes it impossible to complete HP 14 worst case assessment. The absence of these elements will not affect HP 4, HP 5, HP 6, HP 7, HP 8, HP 10, HP 11, HP 13 assessment.

Step 3. Press “Calculate” button to create an output with a summary of the assessment.

  • As a result of the assessment, a user will see the results of hazard classification for hazard properties HP 4, HP 5, HP 6, HP 7, HP 8, HP 10, HP 11, HP 13 and HP 14 in worst case scenario. Further assessment of these hazard properties is not needed if no potential hazard (green color) is displayed assuming worst case scenario.
  • Then one needs to check whether HP 1, HP 2, HP 3, HP 9, HP 12 and HP 15 are relevant and can present potential. In addition, the presence of persistent organic pollutants (POPs) has to be checked - if present, POPs need to be compared to the limit values defined by the POP regulation. ECN can assist in performing this part of assessment.
  • In order to be classified as non-hazardous waste, none of the 15 hazard properties shall be displayed and the POP limits shall not be exceeded.
  • However, if in worst case scenario any of hazard properties HP 4, HP 5, HP 6, HP 7, HP 8, HP 10, HP 11, HP 13 and HP 14 indicate possible hazard, it does not immediately lead to the final classification as hazardous waste. In such case more detailed (waste specific) analysis is needed. ECN can provide consultancy and waste classification that goes beyond the worst case analysis and includes expert judgement of the hazard properties that in worst case display possible hazard.

In case of questions, for advice and consultancy, and any remarks on using ClassifyMyWaste, please contact us at We are happy to receive your feedback!