Ariz. Admin. Code § 18-5-114

Current through Register Vol. 30, No. 50, December 13, 2024

Section R18-5-114 - Grades of Wastewater Treatment Plants and Collection Systems

The Department shall grade a wastewater treatment plant or collection system according to population equivalent served, degree of hazard to public health, class of facility, and degree of treatment, as follows:

1. Grade 1 includes:

a. A stabilization pond that serves 2,000 or fewer persons;

b. A wastewater treatment plant not designated as Grade 2, 3, or 4; or

c. A collection system that serves 2,500 or fewer persons.

2. Grade 2 includes:

a. A stabilization pond that is designed to serve more than 2,000 persons;

b. An aerated lagoon;

c. A facility that employs biological treatment based upon the activated sludge principle or trickling filters and is designed to serve 5,000 or fewer persons, except as provided in subsection (3)(c); or

d. A collection system that serves between 2,501 to 10,000 persons.

3. Grade 3 includes:

a. A facility that employs biological treatment based upon the activated sludge principle and is designed to serve 5,001 to 20,000 persons;

b. A facility that employs trickling filtration and is designed to serve 5,001 to 25,000 persons;

c. A variation of biological treatment based on the activated sludge principle that requires specialized knowledge, including contact stabilization, and is designed to serve 20,000 or fewer persons; or

d. A collection system that serves 10,001 to 25,000 persons.

4. Grade 4 includes:

a. A facility that employs biological treatment based upon the activated sludge principle and is designed to serve more than 20,000 persons;

b. A facility that employs trickling filtration and is designed to serve a population equivalent more than 25,000 persons; or

c. A collection system that serves more than 25,000 persons.

Ariz. Admin. Code § R18-5-114

Former Section R9-20-519 repealed, new Section R9-20-519 adopted effective November 1, 1979 (Supp. 79-6). Former Section R9-20-519 amended, renumbered as Section R9-20-514, then renumbered as Section R18-4-114 effective October 23, 1987 (Supp. 87-4). R18-5-114 recodified from R18-4-114 (Supp. 95-2). Amended by final rulemaking at 7 A.A.R. 1171, effective February 16, 2001 (Supp. 01-1). Amended to correct manifest typographical error in subsection (3)(d) (Supp. 01-3).