To support rule development, EPA expanded its microbial and disinfection byproduct (DBP) research program and entered into collaborative efforts with other agencies and the water industry to collect data. This data collection effort included the Information Collection Rule (ICR) and the ICR Supplemental Survey (ICRSS). In addition, under a joint effort between EPA and the National Rural Water Association (NRWA), NRWA State chapters conducted a survey of disinfection byproduct and treatment information at small public water systems (PWSs). EPA has worked with stakeholders under the Federal Advisory Committee Act (FACA) to develop the proposed Stage 2 Disinfection Byproducts Rule (Stage 2 DBPR) and Long Term 2 Enhanced Surface Water Treatment Rule (LT2ESWTR). These rules have been developed concurrently, using occurrence data from the ICR and other available sources to ensure that microbial protection is maintained or enhanced while exposure to DBPs is reduced.