4. The following projects, apparatus and equipment relating to drinking water are exempt from the application of section 32 of the Environment Quality Act (chapter Q-2):(1) the reconstruction of water mains other than those ensuring the elimination of microorganisms in accordance with section 5 or 6 of the Regulation respecting the quality of drinking water (chapter Q-2, r. 40);
(2) the reconstruction of the following apparatus and equipment:(a) pumping, booster or rechlorination stations;
(b) drinking water treatment apparatus and equipment, provided that the work does not result in modification of drinking water treatment or an increase in capacity; and
(c) raw water storage reservoirs or drinking water distribution reservoirs other than those ensuring the elimination of microorganisms in accordance with section 5 or 6 of the Regulation respecting the quality of drinking water (chapter Q-2, r. 40), if the work does not result in an increase in capacity and if the reservoirs are reconstructed at the same locations;
(3) the installation or increase in the production capacity of drinking water treatment apparatus or equipment serving 20 persons or less, provided that the work does not increase the number of persons served to more than 20;
(4) the installation of water mains in a stand-alone distribution system that supplies 20 persons or less, provided that the work does not increase the number of persons served to more than 20;
(5) the installation, on an existing distribution system, or the reconstruction of(a) chambers for shut-off valves, drain valves, air valves, meters or other similar apparatus or equipment; and
(b) distribution system accessories; and
(6) the installation, on a lot, of water mains, reservoirs and accessories intended to supply only one building situated on that same lot.