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Total Coliform Rule Revisions

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The 1996 amendments to the Safe Drinking Water Act [Section 1412(b) (9)] require the Administrator to review and revise, as appropriate, each national primary drinking water regulation not less often than every 6 years. EPA published as part of its National Primary Drinking Water Regulation (NPDWR) Review its decision to revise the TCR in July 2003.

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Meeting Information

EPA plans to hold meetings and webcasts regarding potential changes to the Total Coliform Rule and the possible addition of distribution system requirements.  More information about planned and past meetings is provided below.

Future meetings and webcasts

Total Coliform Rule Revisions - May 11 and 12, 2010, Washington DC

Past meetings and webcasts

Total Coliform Rule Revisions - April 3, 2009
Total Coliform Rule Revision / Distribution System Technical Public Meeting - June 13, 2007
Total Coliform Rule / Distribution System Stakeholder Technical Workshop and Request for Nominations - January 30 - February 1, 2007

On January 30-February 1, 2007, the Environmental Protection Agency (EPA) held a technical workshop in Washington, DC, to discuss available information on the Total Coliform Rule (TCR) and available information regarding risks in distribution systems in support of revisions to the TCR. As part of the technical workshop, EPA discussed information and analytic approaches for characterizing risks posed by the distribution system.   As an outcome of this meeting and the other considerations, EPA decided to convene a Federal Advisory Committee (FAC).  For more information regarding the solicitation of nominations for membership for that FAC before its establishment, use the link provided below.

Preparatory Webcast – January 17, 2007, 2:00pm – 4:30 pm EST

On January 17, 2007 EPA hosted an important preparatory webcast for the Stakeholder Technical Workshop. The purpose of the webcast was to provide basic background information to technical workshop attendees who do not have a good deal of experience with TCR-DS issues, ensuring that all workshop attendees had a common base of information with which to understand and discuss workshop presentations and materials. Please see the links to the agenda and presentation materials below for more information on the topics that were covered.

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Review by the Science Advisory Board Drinking Water Committee on EPA's Draft Supporting Analyses for the Proposed Revised Total Coliform Rule

The Environmental Protection Agency (EPA), Office of Water, requested that the Science Advisory Board (SAB) Drinking Water Committee (DWC) review the draft supporting analyses for the proposed Revised Total Coliform Rule (RTCR). The SAB review focused on (1) the data sources used to estimate baseline total coliform and E. coli occurrence, public water system profile, and sensitive subpopulations in the United States, (2) the occurrence analysis used to inform the benefits analysis, (3) the qualitative analysis used to assess the reduction in risk due to implementation of the rule requirements, and (4) analysis of the engineering costs and costs to states resulting from implementation of the revisions.

Final Report

The following files were provided to facilitate the SAB DWC review:

Draft Supporting Analyses

Supplemental Information

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TCR Issue Papers

EPA and AWWA developed a series of TCR Issue Papers to present available information on a range of issues related to the TCR.  The paper topics were based on feedback from stakeholders and comments received on the TCR since promulgation.  The objective of the issue papers is to review the available data, information and research regarding issues relevant to the revision of the TCR, and where relevant, identify areas in which additional research may be warranted.  Draft papers were completed in June 2006 and were reviewed by a range of industry experts and stakeholders from :

EPA held a TCR Experts workshop in June 2006 to discuss the draft papers and possible rule revisions.  The review and comment by the experts constitutes peer review of the papers.

EPA will use the papers as information sources for discussions of TCR issues with the drinking water community, experts and stakeholders.

The papers are:

Note - The papers present available information and do not represent Agency policy or necessarily reflect the views of EPA. The papers on Distribution System Monitoring Strategies and Distribution System Inventory were prepared by AWWA.

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