The commissioner may adopt rules under N.H. Rev. Stat. Chapter 541-A relative to treatment of wastes by or from industrial and nonindustrial recipients of waste treatment services to establish:
I. Classes of users of such services, including categories of industrial users.
II. Criteria against which to determine the adequacy of charges imposed on classes and categories of users reflecting all factors that influence the cost of waste treatment, including strength, volume, and delivery flow rate characteristics of waste.
III. Certification criteria for pollution control facilities operators.