Domestic sewage treatment plants with a capacity of up to 7.5 m3 per day do not require a building permit, but a simple notification (Article 29(1)(3) and Article 30(1)(1) of the Building Law). The presence of a municipal sewage system precludes the possibility of placing a treatment plant. In addition, it is forbidden to build it in periodically flooded areas. For more information also on the water permit and the notification procedure, see the guide.