The Stage 2 Disinfectants and Disinfection Byproducts Rule is a new federal regulation (NOTE: Stage 1 is a final federal regulation and was published in the Pennsylvania Bulletin on July 21, 2001). The US Environmental Protection Agency created Stage 2 to supplement existing regulations by requiring drinking water suppliers to meet disinfection byproduct maximum contaminant levels at each monitoring site in the distribution system. This rule seeks to better identify monitoring sites where customers are exposed to high levels of disinfection byproducts. This regulation will reduce byproduct exp