Exemptions: non-residential systems that receive transported water
 7. (1) Schedules 2, 3, 8, 9, 11 to 15 and 21 do not apply to one of the following drinking water systems if all of its drinking water is transported to the system from a drinking water system described in subsection (1.1) and the drinking water is stored in a container that is constructed and maintained in a manner that prevents surface water and other foreign materials from coming into contact with the drinking water: 1. A large municipal non-residential system. 2. A small municipal non-residential system. 3. A large non-municipal non-residential system. 4. A small non-municipal non-residential system.  O. Reg. 170/03, s. 7 (1); O. Reg. 247/06, s. 5 (1); O. Reg. 418/09, s. 5. (1.1) Subsection (1) applies if the drinking water system from which drinking water is transported, (a) provides primary disinfection in accordance with section 1-3 of Schedule 1 or section 2-3 of Schedule 2, or provides filtration and primary disinfection in accordance with section 1-4 of Schedule 1 or section 2-4 of Schedule 2; and (b) provides secondary disinfection in accordance with section 1-5 of Schedule 1 or section 2-5 of Schedule 2.  O. Reg. 247/06, s. 5 (2). (2) The owner of the drinking water system referred to in subsection (1) that receives the drinking water and the operating authority for the system shall ensure that a distribution sample is taken at least once a day and is tested for, (a) free chlorine residual, if the system from which the drinking water is obtained provides chlorination and does not provide chloramination; or (b) combined chlorine residual, if the system from which the drinking water is obtained provides chloramination.  O. Reg. 170/03, s. 7 (2). (3) Subsection (2) does not apply to a drinking water system on days on which all designated facilities and all public facilities served by the system are not open.  O. Reg. 269/03, s. 4. (4) Subsection (2) does not apply to a drinking water system if all of the following criteria are satisfied: 1. A point of entry treatment unit owned or leased by the owner of the system is connected to the plumbing of every building and other structure that is served by the drinking water system and is part of a designated facility or public facility. 2. None of the point of entry treatment units use chlorination or chloramination. 3. Each point of entry treatment unit, i. has a feature that ensures that no water is directed to users of water treated by the unit in the event that the unit malfunctions, loses power or ceases to provide the appropriate level of disinfection, or ii. is designed and operated in accordance with the standards described in subsection (5). 4. If a point of entry treatment unit has a feature described in subparagraph 3 i and the unit malfunctions, loses power or ceases to provide the appropriate level of disinfection, a person takes appropriate action at the location where the unit is installed before water is again directed to users of water treated by the unit.  O. Reg. 247/06, s. 5 (3). (5) The standards referred to in subparagraph 3 ii of subsection (4) are the following: 1. The point of entry treatment unit must have a feature that causes an alarm to signal immediately at the following locations if the unit malfunctions, loses power or ceases to provide the appropriate level of disinfection: i. The building or structure where the point of entry treatment unit is installed. ii. A location where a person is present, if a person is not always present at the location described in subparagraph i. iii. Every designated facility served by the drinking water system. 2. If an alarm signals under paragraph 1, a person who is at the building or structure where the point of entry treatment unit is installed must take appropriate action or a person must promptly be dispatched to that location to take appropriate action. 3. A person who is dispatched under paragraph 2 must arrive at the building or structure where the point of entry treatment unit is installed as soon as possible.  O. Reg. 247/06, s. 5 (3); O. Reg. 458/16, s. 4.