Arizona Administrative Code › Title 18 - ENVIRONMENTAL QUALITY › Chapter 11 - DEPARTMENT OF ENVIRONMENTAL QUALITY - WATER QUALITY STANDARDS › Article 4 - AQUIFER WATER QUALITY STANDARDS › Section R18-11-406 - Numeric Aquifer Water Quality Standards: Drinking Water Protected Use

Current through Register Vol. 30, No. 28, July 12, 2024
A. The aquifer
				water quality standards in this Section apply to aquifers that are classified
				for drinking water protected use.
B. The following are the aquifer water
				quality standards for inorganic chemicals:
Pollutant
mg/L)
Antimony
0.006
Arsenic
0.05
Asbestos
7 million fibers/liter (longer than 10 mm)
Barium
2
Beryllium
0.004
Cadmium
0.005
Chromium
0.1
Cyanide (As Free Cyanide)
0.2
Fluoride
4.0
Lead
0.05
Mercury
0.002
Nickel
0.1
Nitrate (as N)
10
Nitrite (as N)
1
Nitrate and nitrite (as N)
10
Selenium
0.05
Thallium
0.002
C.
				The following are the aquifer water quality standards for organic chemicals:
Pollutant
(mg/L)
Benzene
0.005
Benzo (a) pyrene
0.0002
Carbon Tetrachloride
0.005
o-Dichlorobenzene
0.6
para-Dichlorobenzene
0.075
1,2-Dichloroethane
0.005
1,1-Dichloroethylene
0.007
cis-1,2-Dichloroethylene
0.07
trans-1,2-Dichloroethylene
0.1
1,2-Dichloropropane
0.005
Dichloromethane
0.005
Di (2-ethylhexyl) adipate
0.4
Di (2-ethylhexyl) pthalate
0.006
Ethylbenzene
0.7
Hexachlorobenzene
0.001
Hexachlorocyclopentadiene
0.05
Monochlorobenzene
0.1
Pentachlorophenol
0.001
Styrene
0.1
2,3,7,8-TCDD (Dioxin)
0.00000003
Tetrachloroethylene
0.005
Toluene
1
Trihalomethanes (Total)
0.10
1,2,4-Trichlorobenzene
0.07
1,1,1-Trichloroethane
0.20
1,1,2-Trichloroethane
0.005
Trichloroethylene
0.005
Vinyl Chloride
0.002
Xylenes (Total)
10
D.
				The following are the aquifer water quality standards for pesticides and
				polychlorinated biphenyls (PCBs):
Pollutant
(mg/L)
Alachlor
0.002
Atrazine
0.003
Carbofuran
0.04
Chlordane
0.002
Dalapon
0.2
1,2-Dibromo-3-Chloropropane (DBCP)
0.0002
2,4,-Dichlorophenoxyacetic Acid(2,4-D)
0.07
Dinoseb
0.007
Diquat
0.02
Endothall
0.1
Endrin
0.002
Ethylene Dibromide (EDB)
0.00005
Glyphosate
0.7
Heptachlor
0.0004
Heptachlor Epoxide
0.0002
Lindane
0.0002
Methoxychlor
0.04
Oxamyl
0.2
Picloram
0.5
Polychlorinated Biphenols (PCBs)
0.0005
Simazine
0.004
Toxaphene
0.003
2,4,5-Trichlorophenoxypropionic Acid (2,4,5-TP or
							 Silvex)
0.05
E.
				The following are the aquifer water quality standards for radionuclides:
1. The maximum concentration for gross alpha
				particle activity, including Radium-226 but excluding radon and uranium, shall
				not exceed 15 pCi/l.
2. The maximum
				concentration for combined Radium-226 and Radium-228 shall not exceed 5
				pCi/l.
3. The average annual
				concentration of beta particle and photon radioactivity from man-made
				radionuclides shall not produce an annual dose equivalent to the total body or
				any internal organ greater than 4 millirem/year.
4. Except for the radionuclides listed in
				this subsection, the concentration of man-made radionuclides causing 4 millirem
				total body or organ dose equivalents shall be calculated on the basis of a
				2-liter-per-day drinking water intake using the 168-hour data listed in
				"Maximum Permissible Body Burdens and Maximum Permissible Concentration of
				Radionuclides in Air or Water for Occupational Exposure," National Bureau of
				Standards Handbook 69, National Bureau of Commerce, as amended August 1963 (and
				no future editions), incorporated herein by reference and on file with the
				Office of the Secretary of State and with the Department. If two or more
				radionuclides are present, the sum of their annual dose equivalent to the total
				body or to any organ shall not exceed 4 millirem/year. The following average
				annual concentrations are assumed to produce a total body or organ dose of 4
				millirem/year:
Radionuclide
Critical Organ
pCi/l
Tritium
Total body
20,000
Strontium-90
Bone Marrow
8