The department shall adopt rules to administer this chapter that include, but are not limited to, provisions establishing the basis for classification of wastewater treatment plants in accordance with section 4172 and provisions establishing requirements for examinations, qualifications and ethical standards required of candidates to obtain certification. Rules adopted pursuant to this section are routine technical rules as defined in Title 5, chapter 375, subchapter 2‑A.   [PL 2021, c. 173, §16 (AMD).]