363. The Regional Government may, by ordinance, prepare minimum standards(1) for the construction of houses and buildings in its territory; such standards may vary in different parts of the territory according to the geography and nature of the regions;
(2) to ensure the sanitary condition of public and private property;
(3) to prevent the pollution of the waters within or adjacent to the municipalities and to provide for the cleansing and purification of municipal waters; and
(4) to regulate the sewerage of the municipalities.
The municipal corporations in the territory shall retain their competence in these matters until the Regional Government exercises its competence respecting such matters and to the extent that the Regional Government has refrained from doing so.
Any by-law of any municipal corporation in the territory shall be in conformity with the ordinances of the Regional Government respecting these matters.
No by-law of a municipal corporation in the territory respecting such matters shall validly impose standards which are inferior to those mentioned in the ordinance of the Regional Government.