Mississippi Administrative Code
Title 15 - Mississippi Department of Health
Part 20 - Bureau of Public Water Supply
Subpart 72 - Public Water Supply
Chapter 3 - REGULATION GOVERNING FLUORIDATION OF COMMUNITY WATER SUPPLIES
Subchapter 2 - ADJUSTED FLUORIDATED WATER SYSTEM REQUIREMENTS
Rule 15-20-72-3.2.1 - Testing

A minimum number of samples shall be collected by designated CWS personnel based on the water supply's classification on different days each week at all entry points and analyzed for fluoride content. At least once each month at each entry point, designated CWS personnel shall divide (split) one sample (hereinafter referred to as the split sample) and have one portion analyzed for fluoride by designated CWS personnel and the other portion analyzed by the Department's laboratory or a private lab certified by the Department for fluoride testing.

Miss. Code Ann. § 41-26-6