Revisions to the Interim Enhanced Surface Water Treatment Rule (IESWTR), the Stage 1 Disinfectants and Disinfection Byproducts Rule (Stage 1 DBPR), and Revisions to State Primacy Requirements To Implement the Safe Drinking Water Act (SDWA) Amendments

This direct final action will make minor revisions to the Interim Enhanced Surface Water Treatment Rule (IESWTR) and the Stage 1 Disinfectants and Disinfection Byproducts Rule (Stage 1 DBPR) which were published December 16, 1998 and the Revisions to State Primacy Requirements to Implement Safe Drinking Water Act (SDWA) Amendments (Primacy Rule) published April 28, 1998. This Direct Final Rule revises the compliance dates for the IESWTR and the Stage 1 DBPR by shifting them back approximately two weeks from the middle of the month to the beginning of the following month. This change will shift the monitoring periods to coincide with calendar quarters which will facilitate the implementation of both rules. This action will also extend the use of new analytical methods included in these rules to compliance monitoring for long standing drinking water regulations for total trihalomethanes. The revisions also include several changes to the regulatory language for clarification. In addition, this document corrects typographical errors, replaces inadvertently deleted text, and clarifies some of the new regulatory provisions found in the published rules. Lastly, this document contains corrections to the Primacy Rule. These regulations relate to the requirements and procedures for States to obtain primary enforcement authority (primacy) for the Public Water System Supervision (PWSS) program under the Safe Drinking Water Act as amended by the 1996 Amendments.