[Code of Federal Regulations] [Title 40, Volume 21] [Revised as of July 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR141.6] [Page 352-353] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 141_NATIONAL PRIMARY DRINKING WATER REGULATIONS--Table of Contents Subpart A_General Sec. 141.6 Effective dates. (a) Except as provided in paragraphs (b) through (k) of this section, and in Sec. 141.80(a)(2), the regulations set forth in this part shall take effect on June 24, 1977. (b) The regulations for total tri hal o methanes set forth in Sec. 141.12(c) shall take effect 2 years after the date of pro mul gation of these regulations for community water systems serving 75,000 or more individuals, and 4 years after the date of promulgation for communities serving 10,000 to 74,999 individuals. (c) The regulations set forth in Sec. Sec. 141.11(d); 141.21(a), (c) and (i); 141.22(a) and (e); 141.23(a)(3) and (a)(4); 141.23(f); 141.24(e) and (f); 141.25(e); 141.27(a); 141.28(a) and (b); 141.31(a), (d) and (e); 141.32(b)(3); and 141.32(d) shall take effect immediately upon promulgation. (d) The regulations set forth in Sec. 141.41 shall take effect 18 months from the date of promulgation. Suppliers must complete the first round of sampling and reporting within 12 months following the effective date. (e) The regulations set forth in Sec. 141.42 shall take effect 18 months from the date of promulgation. All requirements in Sec. 141.42 must be completed within 12 months following the effective date. (f) The regulations set forth in Sec. 141.11(c) and Sec. 141.23(g) are effective May 2, 1986. Section 141.23(g)(4) is effective October 2, 1987. (g) The regulations contained in Sec. 141.6, paragraph (c) of the table in 141.12, and 141.62(b)(1) are effective July 1, 1991. The regulations contained in Sec. Sec. 141.11(b), 141.23, 141.24, 142.57(b), 143.4(b)(12) and (b)(13), are effective July 30, 1992. The regulations contained in the revisions to Sec. Sec. 141.32(e) (16), (25) through (27) and (46); 141.61(c)(16); and 141.62(b)(3) are effective January 1, 1993. The effective date of regulations contained in Sec. 141.61(c) (2), (3), and (4) is postponed. (h) Regulations for the analytic methods listed at Sec. 141.23(k)(4) for measuring antimony, beryllium, cyanide, nickel, and thallium are ef fective August 17, 1992. Regulations for the analytic methods listed at Sec. 141.24(f)(16) for dichloromethane, 1,2,4-tri chlor o benzene, and 1,1,2-tri chlor o ethane are effective August 17, 1992. Regulations for the analytic methods listed at Sec. 141.24(h)(12) for measuring dalapon, dinoseb, diquat, endothall, endrin, glyphosate, oxamyl, picloram, simazine, benzo(a)pyrene, di(2-ethylhexyl)adipate, di(2-ethylhexyl)ph thalate, hex a chlor o ben zene, hexachlorocyclopentadiene, and 2,3,7,8-TCDD are effective August 17, 1992. The revision to Sec. 141.12(a) promulgated on July 17, 1992 is effective on August 17, 1992. (i) [Reserved] (j) The arsenic maximum contaminant levels (MCL) listed in Sec. 141.62 is effective for the purpose of compliance on January 23, 2006. Requirements relating to arsenic set forth in Sec. Sec. 141.23(i)(4), 141.23(k)(3) introductory text, 141.23(k)(3)(ii), 141.51(b), 141.62(b), 141.62(b)(16), 141.62(c), 141.62(d), and 142.62(b) revisions in Appendix A of subpart O for the consumer confidence rule, and Appendices A and B of subpart Q for the public notification rule [[Page 353]] are effective for the purpose of compliance on January 23, 2006. However, the consumer confidence rule reporting requirements relating to arsenic listed in Sec. 141.154(b) and (f) are effective for the purpose of compliance on February 22, 2002. (k) Regulations set forth in Sec. Sec. 141.23(i)(1), 141.23(i)(2), 141.24(f)(15), 141.24(f)(22), 141.24(h)(11), 141.24(h)(20), 142.16(e), 142.16(j), and 142.16(k) are effective for the purpose of compliance on January 22, 2004. [44 FR 68641, Nov. 29, 1979, as amended at 45 FR 57342, Aug. 27, 1980; 47 FR 10998, Mar. 12, 1982; 51 FR 11410, Apr. 2, 1986; 56 FR 30274, July 1, 1991; 57 FR 22178, May 27, 1992; 57 FR 31838, July 17, 1992; 59 FR 34322, July 1, 1994; 61 FR 24368, May 14, 1996; 66 FR 7061, Jan. 22, 2001; 66 FR 28350, May 22, 2001]