Arizona Administrative Code › Title 18 - ENVIRONMENTAL QUALITY › Chapter 9 - DEPARTMENT OF ENVIRONMENTAL QUALITY - WATER POLLUTION CONTROL › Article 6 - UNDERGROUND INJECTION CONTROL › Part J - CLASS VI INJECTION WELL REQUIREMENTS › Table 1 - Applicable Standards National Primary Drinking Water Regulations

Current through Register Vol. 30, No. 28, July 12, 2024
Contaminant
MCL1
								(mg/L)2
Alachlor
0.002
Alpha/photon emitters
15 picocuries per Liter (pCi/L)
Antimony
0.006
Arsenic
0.010
Asbestos (fibers>10
								micrometers)
7 million fibers per Liter (MFL)
Atrazine
0.003
Barium
2
Benzene
0.005
Benzo(a)pyrene (PAHs)
0.0002
Beryllium
0.004
Beta photon emitters
4 millirems per year
Bromate
0.010
Cadmium
0.005
Carbofuran
0.04
Carbon tetrachloride
0.005
Chlordane
0.002
Chlorite
1.0
Chlorobenzene
0.1
Chromium (total)
0.1
Cyanide (as free cyanided)
0.2
2,4-D
0.07
Dalapon
0.2
1,2-Dibromo-3-chloropropane (DBCP)
0.0002
o-Dichlorobenzene
0.6
P-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
Dichloromethane
0.005
1,2-Dichloropropane
0.005
Di(2-ethylhexyl) adipate
0.4
DI(2-ethylhexyl) phthalate
0.006
Dinoseb
0.007
Dioxin (2,3,7,8-TCDD)
0.00000003
Diquat
0.02
Endothall
0.1
Endrin
0.002
Ethylbenzene
0.7
Ethylene dibromide
0.00005
Fecal coliform and
E.coli
MCL3
Fluoride
4.0
Glyphosate
0.7
Haloacetic acids (HAA5)
0.060
Heptachlor
0.0004
Heptachlor epoxide
0.0002
Hexachlorobenzene
0.001
Hexachlorocyclopentadiene
0.05
Lindane
0.0002
Mercury (inorganic)
0.002
Methoxychlor
0.04
Nitrate (measured as Nitrogen)
10
Nitrite (measured as Nitrogen)
1
Oxamyl (Vydate)
0.2
Pentachlorophenol
0.001
Picloram
0.5
Polychlorinated biphenyls (PCBs)
0.0005
Radium 226 and Radium 228
								(combined)
5 pCi/L
Selenium
0.05
Simazine
0.004
Styrene
0.1
Tetrachloroethylene
0.005
Thallium
0.002
Toluene
1
Total Coliforms
5.0
								percent4
Total Trihalomethanes (TTHMs)
0.080
Toxaphene
0.003
2,4,5-TP (Silvex)
0.05
1,2,4-Trichlorobenzene
0.07
1,1,1-Trichloroethane
0.2
1,1,2-Trichloroethane
0.005
Trichloroethylene
0.005
Uranium
30µg/L
Vinyl chloride
0.002
Xylenes (total)
10
NOTES
1 Maximum Contaminant Level
					 (MCL) - The highest level of a contaminant that is allowed in drinking water.
					 MCLs are set as close to MCLGs as feasible using the best available treatment
					 technology and taking cost into consideration. MCLs are enforceable
					 standards.
2 Units are in milligrams per
					 liter (mg/L) unless otherwise noted. Milligrams per liter are equivalent to
					 parts per million (ppm).
3 A routine sample that is
					 fecal coliform-positive or E. coli-positive triggers repeat samples-if any
					 repeat sample is total coliform-positive, the system has an acute MCL
					 violation. A routine sample that is total coliform-positive, and fecal
					 coliform-negative or E. coli-negative triggers repeat samples - if any repeat
					 sample is fecal coliform-positive or E. coli-positive, the system has an acute
					 MCL violation. See also Total Coliforms.
4 No more than 5.0 percent
					 samples total coliform-positive in a month. (For water systems that collect
					 fewer than 40 routine samples per month, no more than one sample can be total
					 coliform-positive per month.) Every sample that has total coliform must be
					 analyzed for either fecal coliforms or E. coli. If two consecutive TC-positive
					 samples, and one is also positive for E. coli or fecal coliforms, system has an
					 acute MCL violation.