The Department is adopting the federal Stage 2 Disinfectants and Disinfection Byproducts Rule (Stage 2 D/DBPR) – including new definitions in 40 CFR 141.2; minor revisions and additions to record maintenance requirements in 40 CFR 141.33; revisions to the maximum contaminant levels (MCLs) for disinfection byproducts; revisions to the Stage 1 D/DBPR requirements in 40 CFR 141, Subpart L; and revisions to the consumer confidence report requirements in 40 CFR 141, Subpart O – and is adopting federal revisions to drinking water analytical methods in 40 CFR 141. The Department also is making, where necessary, clarifications pertaining to the federal Stage 2 D/DBPR and the federal revisions to drinking water analytical methods. Rule 62-550.200, F.A.C., is being amended to incorporate the new Stage 2 D/DBPR definitions in 40 CFR 141.2. Rule 62-550.310, F.A.C., is being amended to expand the applicability of the chlorine and chloramine maximum residual disinfectant levels (MRDLs) in accordance with the Stage 2 D/DBPR; to clarify that the Stage 1 D/DBPR MCLs for total trihalomethanes (TTHM) and haloacetic acids five (HAA5) apply until the date specified for compliance with the Stage 2 D/DBPR MCLs for TTHM and HAA5; and to specify the Stage 2 D/DBPR MCLs for TTHM and HAA5, the water systems to which these MCLs apply, and the effective dates for these MCLs. Rule 62-550.500, F.A.C., is being amended to clarify that the monitoring and compliance measurement requirements in the Stage 2 D/DBPR take precedence over the general monitoring and compliance measurement requirements in Rule 62-550.500, F.A.C.,. Rule 62-550.514, F.A.C., is being amended to expand the applicability of the chlorine and chloramine monitoring requirements in accordance with the Stage 2 D/DBPR and to clarify who must monitor, and when, for bromate, chlorite, TTHM, and HAA5 under the Stage 1 and/or Stage 2 D/DBPRs. Rule 62-550.540, F.A.C., is being amended to expand the applicability of the chlorine and chloramine monitoring requirements in accordance with the Stage 2 D/DBPR and to clarify Stage 2 D/DBPR disinfection byproduct monitoring requirements for consecutive systems. Rule 62-550.550, F.A.C., is being amended to update references to federal drinking water analytical methods and to clarify that ITS free chlorine test strips are approved for use in the determination of free chlorine. Rule 62-550.720, F.A.C., is being amended to incorporate the Stage 2 D/DBPR revisions and additions to record maintenance requirements in 40 CFR 141.33. Rule 62-550.730, F.A.C., is being amended to add a reference to the reporting format for Stage 2 D/DBPR disinfection byproduct monitoring results. Rule 62-550.821, F.A.C., is being revised to incorporate the Stage 2 D/DBPR revisions to the Stage 1 D/DBPR requirements in 40 CFR 141, Subpart L, and to make a minor technical correction. Rule 62-550.822, F.A.C., is being added to adopt the federal Stage 2 D/DBPR and provide clarification where necessary. Rule 62-550.824, F.A.C., is being amended to incorporate the Stage 2 D/DBPR revisions to the consumer confidence report requirements in 40 CFR 141, Subpart O. Table 3 is being revised to add the Stage 2 D/DBPR MCLs for TTHM and HAA5. Tables 7 and 8 are being revised to incorporate Stage 2 D/DBPR information and to make minor technical corrections.