To organise mud-flat walks you need a provincial mud-flat walking permit. The obligation to request a permit applies both to guides working for mud-flat walking organisations and to individual walkers. The provincial authority has set requirements regarding guides’ experience and their equipment. The province of Friesland implements these regulations on behalf of the three provinces bordering on the Wadden Sea (Groningen, Friesland and Noord-Holland).
If you want to arrange a (nature education) excursion, you need to apply for dispensation from the Mud-Flat Walking Regulations (Wadloopverordening) from the Province of Friesland.