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United States Environmental Protection Agency Region 8 Series

By Environmental Protection Agency

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Book Id: WPLBN0000043892
Format Type: PDF eBook
File Size: 0.6 MB
Reproduction Date: 2007
Full Text

Title: United States Environmental Protection Agency Region 8 Series  
Author: Environmental Protection Agency
Language: English
Subject: Ecology, Natural resource issues, Environemtal protection
Collections: Environmental Awareness Library Collection
Publication Date:
Publisher: United States Environmental Protection Agency


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Agency, E. P. (n.d.). United States Environmental Protection Agency Region 8 Series. Retrieved from

Excerpt: SUMMARY: Today, EPA is finalizing maximum contaminant level goals (MCLGs), maximum contaminant levels (MCLs), and monitoring, reporting, and public notification requirements for radionuclides. Today’s rule is only applicable to community water systems. Today’s rule includes requirements for uranium, which is not currently regulated, and revisions to the monitoring requirements for combined radium-226 and radium-228, gross alpha particle radioactivity, and beta particle and photon radioactivity. Based on an improved understanding of the risks associated with radionuclides in drinking water, the current MCL for combined radium-226/-228 and the current MCL for gross alpha particle radioactivity will be retained. Based on the need for further evaluation of the various risk management issues associated with the MCL for beta particle and photon radioactivity and the flexibility to review and modify standards under the Safe Drinking Water Act (SDWA), the current MCL for beta particle and photon radioactivity will be retained in this final rule, but will be further reviewed in the near future.

Table of Contents
Table of Contents I. Background and Summary of the Final Rule A. What did EPA propose in 1991? B. Why did EPA propose changes to the radionuclides drinking water regulations in 1991? C. What new information has become available since 1991? Overview of the 2000 Notice of Data Availability (NODA). D. What are the rationales for the regulatory decisions being promulgated today? 1. Retaining the Combined Radium-226 and Radium-228 MCL a. Major Comments Regarding Retention of the Combined Radium-226 and Radium- 228 MCL 2. The Final Uranium MCL a. What is the final MCL for uranium and the rationale for that regulatory level? b. MCLG and Feasible Level for Uranium c. Basis for 1991 Proposed MCL and Cancer Risk from Uranium d. Uranium Health Effects: Kidney Toxicity e. New Kidney Toxicity Analyses Announced in the NODA f. Costs and Benefits from Regulating Uranium in Drinking Water g. Administrator’s Decision to Promulgate MCL Higher than Feasible Level h. California Drinking Water Regulation i. Summary of Major Comments on the Uranium Options (1) Costs and Benefits of Uranium MCLs of 20, 40, and 80 mg/L or pCi/L (2) The Calculation of the Safe Level for Uranium in Water (3) Compliance Options for Small Systems for an MCL of 20 mg/L or pCi/L (4) The Use of a Dual Standard for Uranium 3. Retaining Beta Particle and Photon Radioactivity MCL


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