{"abstract":"In this document, the Environmental Protection Agency (EPA) is proposing maximum contaminant level goals (MCLGs) for chloroform, monochloroacetic acid (MCAA) and trichloroacetic acid (TCAA); National Primary Drinking Water Regulations (NPDWRs) which consist of maximum contaminant levels (MCLs) and monitoring, reporting, and public notification requirements for total trihalomethanes (TTHM--a sum of chloroform, bromodichloromethane, dibromochloromethane, and bromoform) and haloacetic acids (HAA5--a sum of mono-, di-, and trichloroacetic acids and mono- and dibromoacetic acids); and revisions to the reduced monitoring requirements for bromate. This document also specifies the best available technologies (BATs) for the proposed MCLs. EPA is also proposing additional analytical methods for the determination of disinfectants and disinfection byproducts (DBPs) in drinking water and proposing to extend approval of DBP methods for the determination of additional chemical contaminants. This set of regulations proposed today is known as the Stage 2 Disinfectants and Disinfection Byproducts Rule (Stage 2 DBPR). EPA's objective for the Stage 2 DBPR is to reduce the potential risks of reproductive and developmental health effects and cancer associated with disinfection byproducts (DBPs) by reducing peak and average levels of DBPs in drinking water supplies. The Stage 2 DBPR applies to public water systems (PWS) that are community water systems (CWSs) or nontransient noncommunity water systems (NTNCWs) that add a primary or residual disinfectant other than ultraviolet light or deliver water that has been treated with a primary or residual disinfectant other than ultraviolet light.","action":"Proposed rule.","agencies":[{"raw_name":"ENVIRONMENTAL PROTECTION AGENCY","name":"Environmental Protection Agency","id":145,"url":"https://www.federalregister.gov/agencies/environmental-protection-agency","json_url":"https://www.federalregister.gov/api/v1/agencies/145","parent_id":null,"slug":"environmental-protection-agency"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2003/08/18/03-18149.html","cfr_references":[{"chapter":null,"citation_url":null,"part":141,"title":40},{"chapter":null,"citation_url":null,"part":142,"title":40},{"chapter":null,"citation_url":null,"part":143,"title":40}],"citation":"68 FR 49548","comment_url":null,"comments_close_on":"2003-11-17","correction_of":null,"corrections":[],"dates":"The Agency requests comments on today's proposal. Comments must be received or post-marked by midnight November 17, 2003.","disposition_notes":null,"docket_ids":["FRL-7530-3"],"dockets":[{"supporting_documents":[{"title":"Public Comment and Response Document for the Final Stage 2 Disinfectants and Disinfection Byproducts Rule ( Part 1-4): Chapters 1-26","document_id":"EPA-HQ-OW-2002-0043-0798"},{"title":"Information Collection Request for National Primary Drinking Water Regulations: Final Stage 2 Disinfectants and Disinfection Byproducts Rule.  Washington, DC -- OMB Approved","document_id":"EPA-HQ-OW-2002-0043-0793"},{"title":"Method 327.0, Determination of Chlorine Dioxide and Chlorite Ion In Drinking Water Using Lissamin Green B and Horseradish Peroxidase With Detection By Visible Spectrophotometry [EPA 815-R-05-008]","document_id":"EPA-HQ-OW-2002-0043-0792"},{"title":"Chemical and Biological Characterization of Newly Discovered Iodoacid Drinking Water Disinfection Byproducts","document_id":"EPA-HQ-OW-2002-0043-0784"},{"title":"Chlorination Byproducts and Nitrate in Drinking Water and Risk for Congenital Cardiac Defects","document_id":"EPA-HQ-OW-2002-0043-0779"},{"title":"A Prospective Study of Spontaneous Abortion: Relation to Amount and Source of Drinking Water Consumed in Early Pregnancy","document_id":"EPA-HQ-OW-2002-0043-0777"},{"title":"Disinfection Byproducts: The Next Generation","document_id":"EPA-HQ-OW-2002-0043-0773"},{"title":"Continuous Exposure to Dibromoacetic Acid Delays Pubertal Development and Compromises Sperm Quality in the Rats","document_id":"EPA-HQ-OW-2002-0043-0766"},{"title":"D1253-03 Standard Test Method for Residual Chlorine in Water","document_id":"EPA-HQ-OW-2002-0043-0739"},{"title":"Stage 2 ICR 83I OMB Approved Form","document_id":"EPA-HQ-OW-2002-0043-0735"}],"agency_name":"EPA","documents":[{"comment_count":null,"comment_start_date":null,"updated_at":"2025-06-13T16:57:33.137-04:00","comment_url":"https://www.regulations.gov/commenton/EPA-HQ-OW-2002-0043-0031","allow_late_comments":false,"id":"EPA-HQ-OW-2002-0043-0031","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":209,"id":"EPA-HQ-OW-2002-0043","title":"National Primary Drinking Water Regulations: Stage 2 Disinfectants and Disinfection Byproducts Rule; National Primary and Secondary Drinking Water Regulations: Approval of Analytical Methods for Chemical Contaminants."}],"document_number":"03-18149","effective_on":null,"end_page":49681,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2003/08/18/03-18149.xml","html_url":"https://www.federalregister.gov/documents/2003/08/18/03-18149/national-primary-drinking-water-regulations-stage-2-disinfectants-and-disinfection-byproducts-rule","images":{"EP18AU03.000":{"large":"https://img.federalregister.gov/EP18AU03.000/EP18AU03.000_large.png","medium":"https://img.federalregister.gov/EP18AU03.000/EP18AU03.000_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.000/EP18AU03.000_original_size.png"},"EP18AU03.022":{"large":"https://img.federalregister.gov/EP18AU03.022/EP18AU03.022_large.png","medium":"https://img.federalregister.gov/EP18AU03.022/EP18AU03.022_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.022/EP18AU03.022_original_size.png"},"EP18AU03.021":{"large":"https://img.federalregister.gov/EP18AU03.021/EP18AU03.021_large.png","medium":"https://img.federalregister.gov/EP18AU03.021/EP18AU03.021_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.021/EP18AU03.021_original_size.png"},"EP18AU03.020":{"large":"https://img.federalregister.gov/EP18AU03.020/EP18AU03.020_large.png","medium":"https://img.federalregister.gov/EP18AU03.020/EP18AU03.020_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.020/EP18AU03.020_original_size.png"},"EP18AU03.004":{"large":"https://img.federalregister.gov/EP18AU03.004/EP18AU03.004_large.png","medium":"https://img.federalregister.gov/EP18AU03.004/EP18AU03.004_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.004/EP18AU03.004_original_size.png"},"EP18AU03.026":{"large":"https://img.federalregister.gov/EP18AU03.026/EP18AU03.026_large.png","medium":"https://img.federalregister.gov/EP18AU03.026/EP18AU03.026_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.026/EP18AU03.026_original_size.png"},"EP18AU03.003":{"large":"https://img.federalregister.gov/EP18AU03.003/EP18AU03.003_large.png","medium":"https://img.federalregister.gov/EP18AU03.003/EP18AU03.003_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.003/EP18AU03.003_original_size.png"},"EP18AU03.025":{"large":"https://img.federalregister.gov/EP18AU03.025/EP18AU03.025_large.png","medium":"https://img.federalregister.gov/EP18AU03.025/EP18AU03.025_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.025/EP18AU03.025_original_size.png"},"EP18AU03.002":{"large":"https://img.federalregister.gov/EP18AU03.002/EP18AU03.002_large.png","medium":"https://img.federalregister.gov/EP18AU03.002/EP18AU03.002_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.002/EP18AU03.002_original_size.png"},"EP18AU03.024":{"large":"https://img.federalregister.gov/EP18AU03.024/EP18AU03.024_large.png","medium":"https://img.federalregister.gov/EP18AU03.024/EP18AU03.024_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.024/EP18AU03.024_original_size.png"},"EP18AU03.001":{"large":"https://img.federalregister.gov/EP18AU03.001/EP18AU03.001_large.png","medium":"https://img.federalregister.gov/EP18AU03.001/EP18AU03.001_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.001/EP18AU03.001_original_size.png"},"EP18AU03.023":{"large":"https://img.federalregister.gov/EP18AU03.023/EP18AU03.023_large.png","medium":"https://img.federalregister.gov/EP18AU03.023/EP18AU03.023_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.023/EP18AU03.023_original_size.png"},"EP18AU03.008":{"large":"https://img.federalregister.gov/EP18AU03.008/EP18AU03.008_large.png","medium":"https://img.federalregister.gov/EP18AU03.008/EP18AU03.008_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.008/EP18AU03.008_original_size.png"},"EP18AU03.007":{"large":"https://img.federalregister.gov/EP18AU03.007/EP18AU03.007_large.png","medium":"https://img.federalregister.gov/EP18AU03.007/EP18AU03.007_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.007/EP18AU03.007_original_size.png"},"EP18AU03.029":{"large":"https://img.federalregister.gov/EP18AU03.029/EP18AU03.029_large.png","medium":"https://img.federalregister.gov/EP18AU03.029/EP18AU03.029_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.029/EP18AU03.029_original_size.png"},"EP18AU03.006":{"large":"https://img.federalregister.gov/EP18AU03.006/EP18AU03.006_large.png","medium":"https://img.federalregister.gov/EP18AU03.006/EP18AU03.006_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.006/EP18AU03.006_original_size.png"},"EP18AU03.028":{"large":"https://img.federalregister.gov/EP18AU03.028/EP18AU03.028_large.png","medium":"https://img.federalregister.gov/EP18AU03.028/EP18AU03.028_medium.png","original_size":"https://img.federalregister.gov/EP18AU03.028/EP18AU03.028_original_size.png"}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