Ariz. Admin. Code § R18-5-115 - Grades of Water Treatment Plants and Distribution Systems

A. Grading of water treatment plants. This subsection does not apply to a facility that distributes water but does not treat water or to a facility that distributes water and disinfects by chlorine gas or hypochlorite only to maintain disinfection levels in the distribution system. The Department shall grade a water treatment plant according to the sum of the points it the Department assigns for each plant characteristic.

1. The Department shall assign points for the purpose of grading a water treatment plant as follows:

Plant Characteristics	Points
Population	1 per 5,000
Maximum Design Capacity	1 per Millions of Gallons per Day up to 10
Groundwater Source	3
Surface or Groundwater Under the Direct Influence of Surface Water Source	5
Carbon Dioxide	2
pH Adjustment	3
Packed Tower Aeration	6
Air Stripping	6
Stability or Corrosion Control	3
Taste and Odor	8
Iron/Manganese Removal	8
Ion Exchange Softening	10
Chemical Precipitation Softening	15
Coagulant Addition	6
Flocculation	4
Sedimentation	4
Upflow Clarification	2
Fluoridation	5
Activated Alumina	6
Blending	5
Residual Waste Stream	5
Control Systems Technology	2
Biologically Active Filter	20
Granular Media Filter	15
Pressure Filter	15
Gravity Sand Filter	10
Membrane Filtration	15
Chlorine Gas	6
Hypochlorite Liquid	2
Hypochlorite Solid	2
Chloramine	9
Chlorine Dioxide	9
Ozone	12
Ultraviolet	3

2. The Department shall assign a grade by the total number of points assigned to the facility, as follows:

Grade	Point Range
Grade 1	1 to 25
Grade 2	26 to 50
Grade 3	51 to 70
Grade 4	More than 70

B. Grading of water distribution systems. The Department shall grade a distribution system according to the sum of the points the Department assigns for each system characteristic.

1. The Department shall assign points for the purpose of grading a distribution system as follows:

System Characteristics	Points
Population	1 per 5,000
Maximum Design Capacity	1 per Millions of Gallons per Day up to 10
Pressure Zones	5
Booster Stations	5
Storage Tanks	3
Blending	5
Fire Protection Systems/Testable Backflow Prevention Assemblies*	5
Cathodic Protection	3
Control System Technologies	2
Chlorine Gas	6
Hypochlorite Liquid	2
Hypochlorite Solid	2
Chloramine	9
Chlorine Dioxide	9

*The presence of one or both of these devices earns five points for the facility.

2. No points are added for Grade 1 small systems that:

a. Only distribute groundwater;

b. Serve fewer than 501 persons;

c. Have no disinfection or disinfect by chlorine gas or hypochlorite only; and

d. Do not store water or store water only in storage tanks.

3. The Department shall assign a grade by the total number of points assigned to the facility, as follows:

Grade	Point Range
Grade 1	0
Grade 2	1 to 20
Grade 3	21 to 35
Grade 4	More than 35

Notes

Ariz. Admin. Code § R18-5-115

Former Section R9-20-520 repealed, new Section R9-20-520 adopted effective November 1, 1979 (Supp. 79-6). Former Section R9-20-520 amended, renumbered as Section R9-20-515, then renumbered as Section R18-4-115 effective October 23, 1987 (Supp. 87-4). R18-5-115 recodified from R18-4-115 (Supp. 95-2). Amended by final rulemaking at 7 A.A.R. 1171, effective February 16, 2001 (Supp. 01-1). Amended by final rulemaking at 7 A.A.R. 5079, effective October 16, 2001 (Supp. 01-4). Amended by final rulemaking at 11 A.A.R. 998, effective April 2, 2005 (Supp. 05-1).