(a) Acceptable laboratories. Samples collected to determine compliance with the requirements of this chapter shall be analyzed at accredited or approved laboratories.(1) Samples used to determine compliance with the maximum contaminant levels, samples used to determine compliance with action level, and raw groundwater source monitoring requirements of this subchapter, and samples for microbial contaminants must be analyzed by a laboratory accredited by the executive director in accordance with Chapter 25, Subchapter A and B of this title (relating to General Provisions; and Environmental Testing Laboratory Accreditation) using acceptable analytical methods as specified in subsection (b) of this section. These samples include:(A) compliance samples for synthetic organic chemicals;(B) compliance samples for volatile organic chemicals;(C) compliance samples for inorganic contaminants;(D) compliance samples for radiological contaminants;(E) compliance samples for microbial contaminants;(F) compliance samples for total trihalomethanes (TTHM);(G) compliance samples for haloacetic acid-group of five (HAA5);(H) compliance samples for chlorite;(I) compliance samples for bromate; and(J) compliance samples for lead and copper.(2) Samples used to determine compliance with the treatment technique requirements and maximum residual disinfectant levels (MRDLs) of this subchapter must be analyzed by a laboratory approved by the executive director. These samples include:(A) compliance samples for turbidity treatment technique requirements;(B) compliance samples for the chlorine MRDL;(C) compliance samples for the chlorine dioxide MRDL;(D) compliance samples for the combined chlorine (chloramine) MRDL;(E) compliance samples for the disinfection byproduct precursor treatment technique requirements, including alkalinity, total organic carbon, dissolved organic carbon analyses, and specific ultraviolet absorbance;(F) samples used to monitor chlorite levels at the point of entry to the distribution system; and(G) samples used to determine pH.(3) Non-compliance tests, such as control tests taken to operate the system, may be run in the plant or at a laboratory of the system's choice.(b) Acceptable analytical methods. Methods of analysis shall be as specified in 40 Code of Federal Regulations (CFR) or by any alternative analytical technique as specified by the executive director and approved by the Administrator under 40 CFR §141.27. Copies are available for review in the Water Supply Division, MC 155, Texas Commission on Environmental Quality, P.O. Box 13087, Austin, Texas 78711-3087. The following National Primary Drinking Water Regulations set forth in