Section 11-20-6 - Maximum microbiological contaminant levels(a) Beginning April 1, 2016, a system is in compliance with the MCL for E. coli for samples taken under the provisions of section 11-20-9.1 unless any of the conditions identified in paragraphs (1) through 4) occur. For purposes of the public notification requirements in section 11-20-18, violation of the MCL may pose an acute risk to health. (1) The system has an E. coli-positive repeat sample following a total coliform-positive routine sample.(2) The system has a total coliform-positive repeat sample following an E. coli-positive routine sample.(3) The system fails to take all required repeat samples following an E. coli-positive routine sample.(4) The system fails to test for E. coli when any repeat sample tests positive for total coliform.(b) Beginning April 1, 2016, a public water system must determine compliance with the MCL for E. coli in subsection (a) for each month in which it is required to monitor for total coliforms.(c) The director hereby identifies the following as the best technology, treatment techniques, or other means available for achieving compliance with the MCL for E. coli in subsection (a): (1) Protection of wells from contamination by coliforms by appropriate placement and construction;(2) Maintenance of a disinfectant residual throughout the distribution system;(3) Proper maintenance of the distribution system including appropriate pipe replacement and repair procedures, main flushing programs, proper operation and maintenance of storage tanks and reservoirs, cross connection control, and continual maintenance of positive water pressure in all parts of the distribution system;(4) Filtration and disinfection of surface water, as described in sections 11-20-46, 11-20-46.1, and 11-20-46.2, or disinfection of ground water, as described in section 11-20-50, using strong oxidants such as chlorine, chlorine dioxide, or ozone; and(5) For systems using ground water, compliance with the requirements of an EPA-approved State Wellhead Protection Program developed and implemented under section 1428 of the Act.(d) The director, pursuant to section 1412 of the Act, hereby identifies the technology, treatment techniques, or other means available identified in subsection (c) as affordable technology, treatment techniques, or other means available to systems serving ten thousand or fewer people for achieving compliance with the MCL for E. coli in subsection (a).[Eff 12/26/81; am and comp 3/7/92; am and comp 1/2/93; am and comp 12/15/94; comp 10/13/97; comp 9/7/99; am and comp 11/30/02; comp 12/16/05; comp 11/28/11; comp MAY 02 2014 ] (Auth: HRS §§ 340E-2, 340E-9)(Imp: HRS §§ 340E-2, 340E-9; 42 U.S.C. §§ 300g-1, 300g-2; 40 C.F.R. Parts 141, 142, § 141.63, § 142.10 )