The VIHB registration is valid for an indefinite period. Companies must comply with the stipulated conditions to remain registered on the VIHB list, as was the case at the start of the registration. NIWO will periodically review the companies which already have a registration, possibly without asking the company. Relevant changes within the company must be reported to NIWO (such as change of owner or director, change of waste coordinator, change of legal form, etc.).