Allowed to be disposed of via the sewer
You may only dispose liquids through the sewer that are not infectious, contain hazardous substances or substances in a (too) high concentration. Ask your occupational health and safety advisor.
Not allowed via the sewer
Do not discharge hazardous substances into the sewer. Substances that belong to the list of Substances of Very High Concern (SVHC) must be disposed of as hazardous waste. These substances are so harmful to the environment that it is forbidden to discharge them. Heavy metals, halogen-rich organic compounds, polycyclic aromatic hydrocarbons (PAHs) and pesticides are examples of SVHCs. In the hospital's Environmental Permit, these 'Substances of Very High Concern' are specifically mentioned.
Whether a solution should be treated as SVHC depends on the concentration. In general, a concentration limit of 0.1% applies. For some substances or categories, there are lower concentration limits that may not be exceeded in the waste water. This data is updated regularly. For an overview of these substances, see: SVHC list.
For mutagens, carcinogens and highly toxic substances, according to the EURAL, a solution containing 0.1% or more of these substances should be treated as hazardous waste.
The 0.1% concentration limit also applies to cytostatic medicines. If you work with (solutions of) cytostatic drugs, follow the normal rules for dealing with carcinogenic and reproductive toxic substances and hazardous waste. In the care departments, disposable materials contaminated with cytostatics must be thrown into the SZA vessel.
See also Cytostatics on this website.