What does CFR 136 refer to in the context of water treatment?

CFR 136 refers to "approved methods and preservation techniques" for water and wastewater analysis as set forth by the Environmental Protection Agency (EPA) in the Code of Federal Regulations (CFR). This regulation is essential for laboratory analysts as it outlines specific methodologies that must be followed to ensure the reliability and accuracy of water quality testing. Adhering to these approved methods ensures that results are consistent and can be legally supported, particularly for compliance monitoring under the Clean Water Act.

Understanding CFR 136 is critical for providing valid data that informs water treatment processes and compliance with federal standards. It ensures that laboratories maintain the integrity of their analyses from sample collection through processing and reporting. This regulation is thus a foundational element of water quality management and assessment.