3.03. Group of 2 buildings served by a tertiary treatment system: Where a group referred to in subparagraph b of the first paragraph of section 3.01 involves different owners for each building concerned, an agreement establishing the undivided co-ownership of the system and the terms for its installation, use, maintenance, repair, replacement and follow-up measures to be implemented must be entered into by the owners concerned. The agreement must produce its effects for the whole period during which the system will serve the 2 buildings and be registered in the land register before filing a permit application with the municipality. Any amendment made to the agreement must be sent to the municipality and registered in the land register within 30 days after the amendment.
Where the group referred to in subparagraph b of the first paragraph of section 3.01 involves at first only 1 owner, the agreement referred to in the first paragraph must be entered into with the various owners, produce its effects and be sent to the municipality within 30 days after the sale of one or more buildings.
In addition, each building of a group referred to in the first paragraph must be equipped with a septic tank complying with Division V if the tertiary treatment system concerned treats the effluents from a septic tank.
For the purposes of paragraph d of section 7.1, the common line of both buildings of such a group is not considered when establishing the limit of the property.