Public Water Supply Regulations, RRNWT (Nu) 1990 c P-23

This regulation states that substances which may have deleterious physiological effect, or for which physiological effects are not known, shall not be introduced onto the system in a manner which would permit them to reach the consumer. Chemical substances under control are listed. This regulation states that the effects of human radiation exposure are viewed as harmful and any unnecessary exposure to ionizing radiation should be avoided.