Section 116400 Of Article 3. Operations From California Health And Safety Code >> Division 104. >> Part 12. >> Chapter 4. >> Article 3.

. If the department determines that a public water system is subject to potential contamination, the department may, by order, require the public water system to conduct a periodic water analysis in accordance with conditions specified by the department. The water analysis shall be reported on a quarterly basis, unless the department finds that reasonable action requires either more or less frequent analysis.