1. A. The Department shall classify a facility in one of four classes:

   1. 1. Water treatment plant,
   2. 2. Water distribution system,
   3. 3. Wastewater treatment plant, or
   4. 4. Wastewater collection system.
2. B. The Department shall classify a facility as one of four grades, Grades 1–4. The grade corresponds with the level of system complexity, with Grade 1 being the most simple and Grade 4 being the most complex.
3. C. For a multi‑facility system, the Department shall grade each facility according to complexity and the total population or population equivalent served.

Historical Note

Adopted as Section R9-20-513 and renumbered as Section R18-4-113 effective October 23, 1987 (Supp. 87-4). Amended subsections (A) and (C) effective November 30, 1988 (Supp. 88-4). R18-5-113 recodified from R18-4-113 (Supp. 95-2). Section repealed; new Section adopted by final rulemaking at 7 A.A.R. 1171, effective February 16, 2001 (Supp. 01-1).