Mississippi Administrative Code
Title 15 - Mississippi Department of Health
Part 20 - Bureau of Public Water Supply
Subpart 72 - Public Water Supply
Chapter 2 - REGULATION GOVERNING THE CERTIFICATION OF MUNICIPAL AND DOMESTIC WATER SYSTEM OPERATORS
Subchapter 4 - General Qualifications for all Certified Waterworks Operators
Rule 15-20-72-2.4.1

One (1) year of the required working experience must be earned under the direct supervision of a certified waterworks operator who holds a valid certification issued by the Bureau at a class equivalent to or higher than that for which certification is being requested. The year of working experience must be obtained in a public water system of a class equivalent to or higher than that for which certification is being applied . The supervising operator must sign a certification statement verifying the successful completion of the required period of supervision. Under special circumstances, the Director may waive the requirements of this section based upon written evidence of good cause.

Miss. Code Ann. § 21-27-205