1. A. The maximum containment levels for radioactive substances are applicable only to community water systems. The following are the MCLs for radioactive substances:

   1. (1) Alpha particle radioactivity: ¹ The combined radium-226 and radium-228 value is determined by the addition of the results of the analysis for radium-226 and the analysis for radium-228. ² The MCL for uranium is effective December 7, 2003 for all community water systems.

      Contaminant	Maximum Contaminant Level
      (a) Combined radium-226 and radium-2281	5 pCi/l
      (b) Gross alpha particle activity (including radium-226)	15 pCi/l
      (c) Uranium	30 µg/l2

   2. (2) Beta particle and photon radioactivity from man-made radionuclides:

      1. (a) The average annual concentration for beta particle and photon radioactivity from man-made radionuclides in drinking water may not produce an annual dose-equivalent to the total body or any internal organ greater than 4 mrem/year;
      2. (b) Compliance with this regulation shall be determined in accordance with 40 CFR §141.66(d).

2. B. Compliance Dates.

   1. (1) Suppliers of water at community water systems shall comply with the MCLs in this regulation on December 8, 2003.
   2. (2) Compliance with reporting requirements for the radionuclides under 40 CFR Part 141, Appendix A to Subpart O and 40 CFR Part 141, Appendices A and B to Subpart Q is required on December 8, 2003.

3. C. Compliance Dates.

   1. (1) Suppliers of water at community water systems shall comply with the MCLs in this regulation on December 8, 2003.
   2. (2) Compliance with reporting requirements for the radionuclides under 40 CFR Part 141, Appendix A to Subpart O and 40 CFR Part 141, Appendices A and B to Subpart Q is required on December 8, 2003.
4. D. The Approving Authority has identified the treatment techniques appearing at 40 CFR §141.66, Table B as the best available technology for achieving compliance with the maximum contaminant levels for radioactive contaminants listed in this regulation.

Authority: Environment Article, Title 9, Subtitles 2 and 4, Annotated Code of Maryland

Effective date: October 21, 1977 (4:22 Md. R. 1670)

Appendix E adopted effective January 27, 1978 (5:2 Md. R. 84)

Regulations .01, .06—.11, .15A, .19A and B, .20F, and .22 amended effective August 10, 1987 (14:16 Md. R. 1774)

Regulations .15G—P, .19E, .28—.33, and .35 adopted effective August 10, 1987 (14:16 Md. R. 1774)

Regulations .26, .27, and .34 adopted effective November 30, 1987 (14:24 Md. R. 2555)

Appendices A—E recodified as Regulation .36

Chapter recodified from COMAR 10.17.07 to COMAR 26.04.01

Chapter revised effective March 18, 1991 (18:5 Md. R. 596)

Regulation .01B amended effective December 21, 1992 (19:25 Md. R. 2208)

Regulation .03A amended effective December 21, 1992 (19:25 Md. R. 2208)

Regulation .04A amended effective December 21, 1992 (19:25 Md. R. 2208)

Regulation .05-2 adopted effective December 21, 1992 (19:25 Md. R. 2208)

Regulation .08 amended effective December 21, 1992 (19:25 Md. R. 2208)

Regulation .10 repealed and new Regulation .10 adopted effective December 21, 1992 (19:25 Md. R. 2208)

Regulation .11 repealed and new Regulation .11 adopted effective December 21, 1992 (19:25 Md. R. 2208)

Regulation .11-1—.11-3 adopted effective December 21, 1992 (19:25 Md. R. 2208)

Regulation .12 amended effective December 21, 1992 (19:25 Md. R. 2208)

Regulation .17 amended effective December 21, 1992 (19:25 Md. R. 2208)

Regulation .20A, F amended effective December 21, 1992 (19:25 Md. R. 2208)

Regulation .33 amended effective December 21, 1992 (19:25 Md. R. 2208)

Chapter revised effective January 2, 1995 (21:26 Md. R. 2192)

Regulation .01B amended effective October 4, 1999 (26:20 Md. R. 1548); October 16, 2000 (27:20 Md. R. 1842)

Regulation .03A amended effective October 16, 2000 (27:20 Md. R. 1842)

Regulation .04 amended effective October 16, 2000 (27:20 Md. R. 1842)

Regulation .12 amended effective October 16, 2000 (27:20 Md. R. 1842)

Regulation .15 amended effective October 16, 2000 (27:20 Md. R. 1842)

Regulation .15-1 amended effective October 16, 2000 (27:20 Md. R. 1842)

Regulation .15-2 amended effective October 16, 2000 (27:20 Md. R. 1842)

Regulation .20-1 amended effective October 16, 2000 (27:20 Md. R. 1842)

Regulation .20-2 adopted effective October 16, 2000 (27:20 Md. R. 1842)

Regulation .23C adopted effective October 16, 2000 (27:20 Md. R. 1842)

Regulation .29D adopted effective October 16, 2000 (27:20 Md. R. 1842)

Regulation .31 repealed effective October 16, 2000 (27:20 Md. R. 1842)

Regulation .36 adopted effective October 4, 1999 (26:20 Md. R. 1548)

Chapter revised as an emergency provision effective January 1, 2002 (29:4 Md. R. 415); revised permanently effective April 29, 2002 (29:8 Md. R. 702)

Chapter revised effective September 1, 2003 (30:17 Md. R. 1205)

Regulation .01B amended effective April 25, 2005 (32:8 Md. R. 743); December 14, 2009 (36:25 Md. R. 1956); August 29, 2016 (43:17 Md. R. 957)

Regulation .01-1 amended effective April 25, 2005 (32:8 Md. R. 743)

Regulation .01-1B amended effective December 14, 2009 (36:25 Md. R. 1956); March 7, 2011 (38:5 Md. R. 319); August 29, 2016 (43:17 Md. R. 957)

Regulation .03A amended effective August 29, 2016 (43:17 Md. R. 957)

Regulation .04A amended effective August 29, 2016 (43:17 Md. R. 957)

Regulation .05F adopted effective March 7, 2011 (38:5 Md. R. 319)

Regulation .05-2 amended effective April 25, 2005 (32:8 Md. R. 743)

Regulation .15-2I amended effective August 29, 2016 (43:17 Md. R. 957)

Regulation .05-2L adopted effective December 14, 2009 (36:25 Md. R. 1956)

Regulation .05-5 adopted effective March 7, 2011 (38:5 Md. R. 319)

Regulation .06-2 amended effective March 7, 2011 (38:5 Md. R. 319)

Regulation .07 amended effective December 14, 2009 (36:25 Md. R. 1956)

Regulation .07-1 amended effective December 14, 2009 (36:25 Md. R. 1956)

Regulation .08E amended effective April 25, 2005 (32:8 Md. R. 743)

Regulation .09C amended effective April 25, 2005 (32:8 Md. R. 743)

Regulation .10 amended effective August 29, 2016 (43:17 Md. R. 957)

Regulation .11 amended effective August 29, 2016 (43:17 Md. R. 957)

Regulation .11D adopted effective March 7, 2011 (38:5 Md. R. 319)

Regulation .11-1 amended effective August 29, 2016 (43:17 Md. R. 957)

Regulation .11-2 amended effective March 7, 2011 (38:5 Md. R. 319); August 29, 2016 (43:17 Md. R. 957)

Regulation .11-3D adopted effective March 7, 2011 (38:5 Md. R. 319)

Regulation .11-4 adopted effective August 29, 2016 (43:17 Md. R. 957)

Regulation .12 amended effective April 25, 2005 (32:8 Md. R. 743)

Regulation .15-2 amended effective April 25, 2005 (32:8 Md. R. 743); December 14, 2009 (36:25 Md. R. 1956); March 7, 2011 (38:5 Md. R. 319)

Regulation .17A amended effective March 7, 2011 (38:5 Md. R. 319)

Regulation .19D amended effective August 29, 2016 (43:17 Md. R. 957)

Regulation .19D, G amended effective March 7, 2011 (38:5 Md. R. 319)

Regulation .20 amended effective April 25, 2005 (32:8 Md. R. 743); December 14, 2009 (36:25 Md. R. 1956); March 7, 2011 (38:5 Md. R. 319)

Regulation .20-1 amended effective March 7, 2011 (38:5 Md. R. 319)

Regulation .20-2 amended effective March 7, 2011 (38:5 Md. R. 319)

Regulation .20C, D amended effective August 29, 2016 (43:17 Md. R. 957)

Regulation .20-2E amended effective December 14, 2009 (36:25 Md. R. 1956); August 29, 2016 (43:17 Md. R. 957)

Regulation .21 amended effective December 14, 2009 (36:25 Md. R. 1956); March 7, 2011 (38:5 Md. R. 319)

Regulation .21H amended effective August 29, 2016 (43:17 Md. R. 957)

Regulation .21I adopted effective August 29, 2016 (43:17 Md. R. 957)

Regulation .23 amended effective December 14, 2009 (36:25 Md. R. 1956)

Regulation .23C amended effective March 7, 2011 (38:5 Md. R. 319)

Regulation .25B amended effective December 14, 2009 (36:25 Md. R. 1956)

Regulation .25C amended effective April 25, 2005 (32:8 Md. R. 743)

Regulation .30B amended effective December 14, 2009 (36:25 Md. R. 1956)

Regulation .34 amended effective March 1, 2004 (31:4 Md. R. 318)