Ariz. Admin. Code § 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.
Notes
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